Wednesday, October 21, 2020

As the Arctic's attractions mount, Greenland is a security black hole

By Jacob Gronholt-Pedersen

COPENHAGEN (Reuters) - On a windy August afternoon in 2017, Akitsinnguaq Ina Olsen was relaxing in the old harbour of Nuuk, Greenland’s capital, when a Chinese icebreaker sailed unannounced into the Arctic island’s territorial waters.

Danish patrol vessel P571 Ejnar Mikkelsen is seen in Sisimiut harbor, Greenland, in 2015. Picture taken in 2015. Kim Moller Petersen/Danish Armed Forces/Handout via

“I saw it by chance,” Olsen, 50, told Reuters. “My first thought was: ‘They’re already here!’ They’re pretty cheeky, those Chinese.”

She pulled out her phone and took a picture of the 167-meter long Chinese icebreaker Xue Long (Snow Dragon), before it turned around and disappeared.

The Chinese ship was one of a growing number of unexpected arrivals in Arctic waters as shrinking sea ice has fast-tracked a race among global powers for control over resources and waterways. Both China and Russia have been making increasingly assertive moves in the region, and after the U.S. Secretary of State Mike Pompeo last year said now is “America’s moment to stand up as an Arctic nation and for the Arctic’s future,” military activity is stepping up.

Greenland is a semi-autonomous part of the Kingdom of Denmark and Copenhagen runs the island’s defence through its Joint Arctic Command. On several occasions since 2006, foreign vessels have turned up unexpectedly or without the necessary protocols, in waters that NATO-member Denmark aims to defend, Greenland residents and military sources in Denmark and the United States told Reuters.

Copenhagen and its Arctic neighbours have tried in recent decades to keep the region what they call a “low tension” area. But each event underscores new challenges for Denmark and its allies.

The main problem: It’s hard to see what’s going on there.

Greenland, which U.S. President Donald Trump offered unsuccessfully to buy from Copenhagen last year, is largely an ice sheet with a rocky coastline of 44,000 km (27,000 miles) - longer than the earth’s equator. It’s hidden by almost complete darkness in the winter months.

Beneath its rocks and ice are abundant resources of minerals and rare earth metals used in equipment from smartphones to electric vehicles and military jets, as well as uranium and potentially vast resources of oil and natural gas.

Greenland offers more than resources. The island, which is nearer to New York than New York is to Los Angeles, is also a strategic window onto space.


Located at Thule, the United States’ northernmost air base houses the 21st Space Wing’s network of sensors, which provides early missile warning and space surveillance and control. Thule is one of the few places in the world with access to satellites that orbit the poles, completing coverage of the globe which is essential for weather forecasting, search-and-rescue and climate research.

“Historically the Arctic, like space, was characterised as a predominantly peaceful domain,” Secretary of the U.S. Air Force Barbara Barrett said in July when presenting America’s Arctic strategy in the transcript of a webinar hosted by the Atlantic Council think tank.

“This is changing.”

Several countries are building new icebreakers to increase freight traffic. China, which in 2018 declared itself a “near-Arctic” nation, has said it wants to build infrastructure and “participate in the governance of the Arctic.”

China has “really gone from zero to 60 in space, very quickly,” U.S. Space Force chief General John W. Raymond told the July presentation. He said China’s capabilities “threaten our access to space in the Arctic” both in Alaska and Thule.

The icebreaker that Olsen photographed in 2017, used by China’s Polar Research Institute for scientific expeditions, had been invited by a researcher in Greenland, the researcher said. But it had not, as would normally be expected, applied in advance for clearance, the head of the Joint Arctic Command Kim Jorgensen told Reuters.

Also in the area taking advantage of the short Arctic summer, a multinational search-and-rescue exercise spotted the Xue Long. Danish armed forces invited it to seek permission to enter, which was granted, Jorgensen said.

China’s foreign ministry did not comment on that incident but said in a statement it respects the sovereignty and jurisdiction of “the Arctic countries in the area” and is ready to make positive contributions to the peace, stability and sustainable development.

By this year, Western allies had increased their presence. U.S. destroyer Thomas Hudner, together with Denmark’s Joint Arctic Command, sailed for the first time into the deep fjord near Nuuk in August. In August and September, a U.S. Coast Guard cutter carried out joint exercises with Danish and French naval vessels on Greenland’s west coast. And last month, Denmark for the first time joined the United States, UK and Norway in a large-scale military exercise in the Barents Sea near Russia.

Danish Defence Minister Trine Bramsen told Reuters in a statement that Denmark wants to keep tension low in the Arctic, “but we must not be naive.” Russia is trying to limit the right to free navigation in international waters, she said; Denmark is taking steps towards strengthening the Armed Forces’ surveillance and presence there.

A spokesperson at the U.S. embassy in Copenhagen said Denmark needs to strengthen its defence in the Arctic with additional investment.

Moscow’s ambassador to Denmark, Vladimir Barbin, said talk of threats to freedom of navigation is a “made-up pretext” for naval exercises and Russia’s activities in the Arctic are peaceful. U.S. policy “accompanied by bellicose rhetoric, is creating a new reality and splitting Arctic states and could open (the) sluice gates for overspill of tension from the outside to the Arctic region,” he told Reuters in a statement.
BELOW THE RADAR

Some Arctic regions are relatively well covered by satellite and radar. But since the early 1990s, Greenland has slipped off the radar.

From 1959 to 1991 Greenland was part of the North American Aerospace Defence Command, an integrated chain of 63 radar and communication centres stretching 3,000 miles from Western Alaska across the Canadian Arctic. It had four radars operating on its ice sheet. Two were dismantled; the other two were abandoned and are now slowly sinking into the ice.

Today, to monitor its vast area, Greenland has one aircraft, four helicopters and four ships. In addition to enforcing sovereignty, they handle fishing inspection and search and rescue operations. Six sleds powered by 80 dogs patrol the remote northeastern part.

In August 2006, a local couple said they spotted a submarine while they were hunting reindeer at the remote Qassit fjord in southern Greenland, said Niels Erik Sorensen, who headed Denmark’s Arctic Command at the time. The couple told the police and made a drawing, which the military identified as a likely Russian model.

“This was the first sighting since the end of the Cold War,” said Sorensen.


The sub was mentioned in a 2016 report on Denmark’s Arctic defence, which said candidly that “there is no access to a coherent picture” of the situation in the area of responsibility for its Arctic Command. Neither the airspace nor activities below sea-level are monitored.

As there is no surveillance, it said, “it is not possible to assess whether violations of sovereignty are taking place in the air. Thus, no deliberate violations of the airspace ... have been found.”

In another part of the Arctic that year, a U.S. Coast Guard vessel accidentally discovered a joint Russian-Chinese naval exercise in Arctic waters near Kamchatka, said Paul Zukunft, who retired as Commandant of the U.S. Coast Guard in 2018.

“This is a region where we did not have any satellite coverage,” he said. “But we did have a ship up there, and they literally stumbled upon this joint naval exercise between Russia and China that otherwise would not have been known.”

Russia’s ambassador said there are no joint Russian-Chinese military-naval exercises in the Arctic Ocean. The Chinese foreign ministry did not comment.

The Danish government promised in 2019 to upgrade military spending in Greenland with a payment of 1.5 billion Danish crowns (£183.5 million) for surveillance. Denmark’s Bramsen said that was a “first step” and Copenhagen has yet to decide how to spend the money.

For now, Denmark has no satellites to monitor traffic around Greenland. In 2018, it started receiving a few satellite images a day from the European Union’s Maritime Safety Agency, but they aren’t always detailed enough for military purposes.

“Denmark will never be able to defend itself in the Arctic,” said Steen Kjaergaard, head of the Centre for Arctic Security Studies at the Royal Danish Defence College, which does research for the defence ministry.

“The government is trying to strike a balance.”


“DARK TARGETS”

That balance is becoming increasingly delicate. For years, it’s been fairly easy for foreign researchers to access the waters around Greenland and those between Greenland, Iceland and the UK, researchers and military sources say: All that’s needed is to fill in a form seeking permission.

Last year, though, Danish authorities failed to approve an application from a Swiss-led group of international researchers, the government said in response to a Freedom of Information request from Reuters. The researchers were planning to travel on a Russian icebreaker, 50 Let Pobedy (50 Years of Victory) on the first-ever circumnavigation of Greenland.

Authorities let the application expire without responding.

Two sources with knowledge of the matter said they had become suspicious that the icebreaker, used for several earlier expeditions in Greenland, could serve non-scientific purposes such as tapping information from subsea fibre cables or mapping the seabed to ease access for Russian submarines.

In 2016, a Russian vessel, Yantar, which the U.S. Navy has alleged transports submersibles that can sever and tap into cables miles beneath the ocean’s surface, anchored outside Nuuk, where a subsea communications cable lands that connects Iceland and America.

Ambassador Barbin said Russia considered the icebreaker decision an “unfortunate misunderstanding,” noting that this year Denmark agreed to another Russian icebreaker visiting Greenland and the Faroe Islands.

Even NATO allies arrive unannounced in these vast, dark waters.

Foreign ships usually report their arrival using the international Automatic Identification System ship-tracking system. When analysing satellite images, the Joint Arctic Command often identifies what it calls “dark targets” - objects that look like ships but can’t be identified on the system.

If the Danish military sends out vessels or helicopters to the target, they often find an iceberg. When the targets have turned out to be ships, these have most often been U.S. marine vessels that haven’t reported their arrival, military sources say.

The U.S. embassy didn’t comment. Denmark’s defence ministry said the allies are working to bolster information sharing.


Edited by Sara Ledwith
Arctic: Culture and Climate exhibition at the British Museum. 
Rare mammoth tusk sculpture on show for first time in Arctic display

Exhibition at British Museum features newly finished Sakha sculpture

Vanessa Thorpe Sun 18 Oct 2020 
 
Collection managers assemble Fedor Markov’s model of the summer solstice ceremony for the Arctic: Culture and Climate exhibition at the British Museum. 
Photograph: British Museum


Ancient mammoth tusk is a seriously niche material to work in, but there is one place where the skills and carving techniques involved are still passed down the generations.

A major new British Museum exhibition, Arctic: Culture and Climate, which starts this week in London, will feature an extraordinary piece of “very rare” sculpture, one that details an arcane ritual and has been completed in collaboration with the Sakha people of north-eastern Russia.

The exhibition, which opens on Thursday, has brought together the largest and most wide-ranging collection of objects from some of the northern-most regions of the world to be displayed in Britain. It focuses not just on details of ancient traditions but on the impact of political and climate change.

Alongside other archeological finds and historic artefacts, such as an antique sled from Greenland and a bronze Evenki spirit mask, the public will have the first chance to see a newly-complete mammoth tusk model, originally made almost 200 years ago and depicting an ancient annual summer festival known as “yhyakh”.

 Fedor Markov with a rare mammoth tusk in his studio.
Photograph: British Museum

“The people of this Sakha community had a very strong revival after the Soviet era ended,” said British Museum curator Amber Lincoln. “Their belief system persists as a faith, although some are also Christian now. Nowadays the yhyakh serves as much as a ritual about national or ethnic identity as for its original purpose of celebrating the summer and praying for good weather.”

Museum experts now have a clearer picture of the ceremony because of the help of art students from the Sakha region who spotted that the model had missing components. It had been lent to Russia for an exhibition, and while on show two students worked to make new figures to finish the scene. On the model’s return, ahead of the new London show, curators commissioned a Sakha artist and master carver, Fedor Markov, to work on fresh replacements for the display.

“Carving the tusk is a high and specialist artform. As a material, it has a different quality to the walrus tusks the Inuit peoples use,” said Lincoln, who also had to request from the Sakha authorities a particularly high quality tusk for Markov to work on.


 A round, coiled basket with carved decoration on the lid in the form of a walrus head with tusks by Marvin Peter, Alaska, 1952. Photograph: British Museum

“We really benefited from what the students had noticed in Russia. Aside from the fact it is a very rare object, it is fantastic to have it in the gallery this month because it is almost like a teaching tool, showing visitors how the real ritual items in the gallery were originally used.”

The semi-nomadic community of Sakha, who call themselves “people of the sun”, and are also known as Yakuts, are a Turkic ethnic group who still celebrate two key religious festivals each year, both revolving around fermented mare’s milk, or koumiss.

“The ceremony’s name can be translated as “sprinkling”, because that’s what the shaman does with the mare’s milk,” explained Lincoln. “It is a way of calling for good weather that will lead to a good harvest. The 24-hour sun at that time of year in the arctic means that if the weather is good there can be an abundance of hay that would take them all the way through the winter. So it was a key moment in their year.” 


An ivory model sled with dogs, north-east Siberia, Russia. Photograph: British Museum

The model shows the central figures of the summer solstice ceremony, with a conical tent and the ceremonial jug and drinking vessels, all corralled inside a fenced area that has been delicately hewn from wood and from preserved mammoth tusk.

Still precious and uncommon, the tusks are actually found with increasing frequency due to the impact of global heating on the polar ice cap.

“The permafrost is melting more, and more and so these mammoth tasks are being found a bit more often. It’s an amazing example of how museums and indigenous communities can work together to create something that explains a new bit of history and gives us new knowledge to share,” said Lincoln.
New Zealand election 2020

Jacinda Ardern considers coalition despite New Zealand election landslide

Prime minister says she will be ready to form a government in two to three weeks as New Zealanders enjoy return to normal life


Eleanor Ainge Roy in Auckland THE GUARDIAN

Sun 18 Oct 2020

Jacinda Ardern has held out the possibility of forming a coalition government despite securing a historic election victory that will enable her Labour party to govern alone.

New Zealanders expressed relief on Sunday at her re-election, after a campaign that felt long and wearying for many. Ardern’s party won the highest percentage of the vote in more than five decades, claiming 64 seats in parliament, with her handling of the Covid-19 crisis regarded as decisive in her win.

Leaders around the world – from Boris Johnson to the Dalai Lama – congratulated her for her compassion and action on climate change.

As Ardern swung straight back into the job – meeting her senior MPs for a coffee – tens of thousands of New Zealanders made their way to Eden Park in Auckland to watch the second Bledisloe cup, further highlighting the country’s many freedoms and liberties at a time when cases in Europe and the US are soaring, and lockdowns slamming back into place. One new local case of Covid did however emerge in Auckland on Sunday, halting the nation’s three-week streak.

But on Sunday, the prime minister said she would take two to three weeks to officially form government, after talks with potential coalition partners. Ardern said she had informed the governor general she would be in a position to form a government soon.

“We’ll be cracking on very quickly with our agenda, we clearly have a mandate from New Zealand,” said Ardern. “I have been a consensus builder but I also need to work with the strong mandate Labour has been given.”

Ardern said new talent coming into the Labour caucus included GPs, a midwife and an infectious disease expert, which would inform her decision on who would take over the crucial health portfolio.

Her opponent, National party leader Judith Collins, said on Sunday morning that she would carry on as leader of the party, but it is yet to be seen if her caucus will back her after such a resounding loss.

Ardern will be making contact with many untested Labour candidates who have been voted in, including a former music teacher and church leader in Hamilton, a midwife in Christchurch, and a long-term foster parent and youth advocate in New Plymouth.

Green party co-leaders James Shaw and Marama Davidson have confirmed they spoke to Ardern. The party won 10 seats in parliament – two more than the previous election – and is hoping to be invited to join her government – pushing it further to the left.

While Labour could rule alone, Shaw is confident the Greens will be included to make use of their ministers’ specific experience, to bolster the new government’s majority and to build their partnership for the future, and an even more progressive government down the line.


“We want to win again in 2023,” Shaw told the Guardian. “We are stronger at the end of our first term in government than we were at the beginning,” Shaw said. “We defied the odds. We made history.

Green supporter Suzanne Kendrick said the new government was full of “young, vibrant and interesting people”. “It’s time to move on from middle-aged people trying to hold on to the past,” Kendrick said, a claim Ardern laid at Collins’ feet, too, during the leaders debates. “And it’s a victory for the whole world, for liberal democracy, for those who believe in that sort of government and in the environment too.”


Ardern’s victory was hailed around the world, with the British prime minister, Boris Johnson, tweeting that he looked forward to working with her on “climate change issues”.

London mayor Sadiq Khan said he and Ardern shared a vision for “for an inclusive, fairer and greener future”.

Canada’s prime minister, Justin Trudeau, said he looked forward to working with Ardern “fighting climate change, empowering women and girls around the world, [and] ensuring equitable vaccine distribution”.

The Dalai Lama also sent warm words of praise and congratulations. “I admire the courage, wisdom and leadership [of Jacinda Ardern], as well as the calm, compassion and respect for others, she has shown in these challenging times.”

“Science and clear communication around Covid-19 have won the day against Trumpery and fake news - people have clearly seen how the government looked after us,” said Christine, a Labour supporter.

“I think people are really grateful with the way Jacinda has handled Covid; she is leading the world. We are able to live our lives normally with very few restrictions - it is just a blessing.”

But political experts in New Zealand say the Labour leader is facing one of the toughest leadership terms in modern history, and expectations are now so high it will be hard for her not to disappoint voters.

The party is also full of inexperienced new MPs, with only a handful of veterans available to manage the important portfolios.

In September, New Zealand officially entered a recession, as a result of multiple lockdowns and closed borders. The tourism industry, construction and horticulture have taken significant knocks, and poverty and benefit numbers are on the rise, with the waiting list for state housing at record highs.

Writing for the Guardian, Claire Robinson says the pressure to deliver is high, and after promising transformational change in her first term, Ardern must now achieve it.

Peter Wilson, an economist, said voters will need more from Ardern than Covid action. “Voters have thanked Ardern for keeping the country safe from Covid-19. They won’t do it again,” he said. “The next three years will be about economic recovery and the way the government deals with it, a very different challenge and arguably a more difficult one.”

Multiple observers have suggested that despite Ardern being a darling of the progressive left, her second term will not be defined by as much dramatic change as promised.

The new government will have much on their plate, but don’t expect large-scale and bold changes,” writes economist Shambueel Eaqab. “Jacinda Ardern as prime minister has been a pragmatic and centrist leader. Quick and bold to act in crises, but cautious with large-scale disruption.”
New Zealand's Jacinda Ardern condemns divisive elections in victory speech – video
 
 'I don't tend to have communications with Donald Trump,' says Jacinda Ardern – video

'We made history': New Zealand Greens on the rise after voters return to the fold

Supporters jubilant after defying poor early polls and gaining first electorate win since 1999



Phil Taylor in Auckland THE GUARDIAN
Sun 18 Oct 2020 
 
Green party co-leaders Marama Davidson and James Shaw show their joy at an election-night function in New Zealand. Photograph: Phil Walter/Getty Images

The mood at the election headquarters of New Zealand’s Green party was triumphal, almost as though the party had won the election outright. The election result was everything they hoped for and perhaps more than they expected.

Just a few weeks ago, polls had the party below the 5% threshold that would trigger proportional representation and deliver it to parliament if none of its candidates won an electorate seat.

Its best chance for the latter was its candidate in Auckland Central, Chlöe Swarbrick, but she was trailing in third in the polls.

On the night, voters returned to the party, delivering it 7.6% of the party vote and Swarbrick a narrow victory in a seat held by National, the main opposition party. It was the first electorate win for a Green candidate since 1999.

While well below the peak of its popularity – the Greens won 11% of the party vote in 2011 – the jubilation among party supporters had the edge of people who feared the gallows but ended up with a bouquet


Green party candidate Chloe Swarbrick was a surprise win in Auckland. Photograph: Phil Walter/Getty Images

“We are stronger at the end of our first term in government than we were at the beginning,” co-leader James Shaw told the crowd. “We defied the odds. We made history.”

It is set to add at least two MPs to the eight it gained at the previous election.

“It’s so great, it’s a vote for New Zealand’s youth,” said Green faithful Suzanne Kendrick. “Look at the room – young, vibrant and interesting people. It’s time to move on from middle-aged people trying to hold on to the past.

“And it’s a victory for the whole world, for liberal democracy, for those who believe in that sort of government and in the environment too.”

While Labour could rule alone, Shaw is confident the Greens will be included to make use of their ministers’ specific experience, to bolster the new government’s majority and to build their partnership for the future.

“We want to win again in 2023,” Shaw told the Guardian.

On Sunday prime minister Jacinda Ardern refused to comment on whether she would invite the Greens into government, but said she had spoken to co-leader James Shaw already, and talks would proceed “swiftly” over the coming weeks.

Ardern said it would take two to three weeks for a government to be declared, because there were half a million special votes still to be counted.

The Greens have been around since 1990. A few of its members became MPs in the early 1990s as part of the Alliance party, an amalgamation of four small parties, but it entered parliament as a stand-alone party in 1999 when it gained more than 5% of the party vote.

Since then the party has consistently scored the biggest share of the vote of the minor parties and became part of a government for the first time in 2017 after pledging to give confidence and supply support to the Labour-NZ First coalition.

The Greens are as much focused on social equity as on the environment and have pushed for New Zealand to become carbon neutral by 2050 and to reduce inequality by increasing benefits and funding to other social services.


Like many countries, New Zealand has responded to Covid-19 by stimulating the economy through massive spending, which has wiped out its budget surplus.

The Greens want to increase the tax take by introducing a “wealth tax”, but Ardern has stated that won’t happen in a government she leads.


Revealed

Sheikh Khalifa’s £5bn London property empire
Documents reveal UAE president owns multibillion-pound property portfolio spanning London’s most expensive neighbourhoods

by Harry Davies THE GUARDIAN 

→Sheikh Khalifa bin Zayed Al Nahyan is president of the United Arab Emirates – and one of London's richest landlords

LONG READ FEATURE THIS IS AN EXCERPT


The row of 1960s-built houses with untidy gardens on a quiet cul-de-sac near Richmond upon Thames appears to have little in common with Ecuador’s red-brick embassy in Knightsbridge, where Julian Assange spent seven years in hiding, just across the road from Harrods.

The unassuming suburban dwellings also have little in common with the site where the Queen was born in central London, or Sexy Fish, a seafood restaurant where diners sit among Damien Hirst mermaid sculptures.

The properties, however, all form part of a secretive £5.5bn real estate empire owned by one of the world’s wealthiest heads of state, Sheikh Khalifa bin Zayed Al Nahyan, the president of the United Arab Emirates and emir of Abu Dhabi.

For all of its conspicuous addresses, the portfolio’s ownership has been shrouded in secrecy for decades. “It was created in a subterranean way through stealth-like deals, quietly put together over many years,” said a source familiar with Khalifa’s business dealings.

Now, leaked documents, court filings and analysis of public records have enabled the Guardian to map Khalifa’s property holdings in the UK, revealing how the oil-rich nation’s president became a major landlord in London. Khalifa’s London property empire appears to surpass even that of the Duke of Westminster, the 29-year-old billionaire aristocrat who owns swathes of the city.

Khalifa’s personal property portfolio, which spans some of London’s most expensive neighbourhoods, is largely comprised of “super prime” commercial and residential properties. Flats in one of the portfolio’s luxury blocks are on the market for about £20m each.

The documents highlight how it is possible in the UK for a deep-pocketed investor such as Khalifa to build up, largely undetected, a sprawling property portfolio with about 1,000 tenants – thanks to a complex structure of shell companies in offshore havens administered by some of London’s top law firms.

Khalifa’s UK property interests first came to light in 2016 when the Guardian’s reporting on the Panama Papers provided a glimpse into how the UAE’s president had secretly acquired dozens of central London properties worth more than £1.2bn.

However, documents seen by the Guardian suggest Khalifa’s holdings are worth almost five times that. In 2005 alone the sheikh spent £1bn on five properties, according to court filings. By 2015, the portfolio had swelled in value to £5.5bn with annual rental income of £160m.

Analysis of Land Registry data suggests Khalifa’s commercial and private property portfolio includes about 170 properties, ranging from a secluded mansion near Richmond Park to multiple high-end London office blocks occupied by hedge funds and investment banks.

There is no suggestion of any wrongdoing and owning UK property through offshore companies is perfectly legal. But the UK government has committed to introducing a register of overseas companies owning UK properties to make the market more transparent and combat corruption.

Khalifa did not respond to the Guardian’s repeated requests for comment.

The sheikh’s properties are now at the heart of a high court dispute that has thrown his UK interests into sharp relief. Earlier this year, the court heard claims the UAE president had installed tanks filled with Evian drinking water at his 18th-century mansion near Windsor. But details of his lifestyle have been upstaged by claims that since a stroke in 2014, Khalifa, who was re-elected as UAE president in 2019, has been “mentally incapacitated” – claims his lawyers have denied.

Lawyers for his former property managers, Lancer, claim the legal case, concerning the approval of certain payments, has been brought as Khalifa’s family members compete for control of his assets. Lancer’s lawyers cited a document they claim shows control of his assets was secretly handed over to a special committee in 2015.

The document, first reported by the investigative website the Sarawak Report and seen by the Guardian, appears to install Khalifa’s half-brother Sheikh Mansour bin Zayed Al Nahyan as the committee’s chairman, suggesting some of London’s prime real estate is now in the hands of the owner of Manchester City football club. Lawyers acting for Khalifa have denied he has “surrendered control of his assets”.

The notarised document purports to be signed by Khalifa but the signature appears to belong to his brother Sheikh Mohammed bin Zayed Al Nahyan, the crown prince of Abu Dhabi, de facto leader of the UAE and one of the most powerful figures in the Middle East.


Tuesday, October 20, 2020

Lily the barn owl reveals how birds fly in gusty winds

by University of Bristol
  
Lily the barn owl demonstrates wing-morphing to cope with gusts in flight. Credit: Cheney et al 2020

Scientists from the University of Bristol and the Royal Veterinary College have discovered how birds are able to fly in gusty conditions—findings that could inform the development of bio-inspired small-scale aircraft.

"Birds routinely fly in high winds close to buildings and terrain—often in gusts as fast as their flight speed. So the ability to cope with strong and sudden changes in wind is essential for their survival and to be able to do things like land safely and capture prey," said Dr. Shane Windsor from the Department of Aerospace Engineering at the University of Bristol.

"We know birds cope amazingly well in conditions which challenge engineered air vehicles of a similar size but, until now, we didn't understand the mechanics behind it," said Dr. Windsor.

The study, published in Proceedings of the Royal Society B, reveals how bird wings act as a suspension system to cope with changing wind conditions. The team used an innovative combination of high-speed, video-based 3-D surface reconstruction, computed tomography (CT) scans, and computational fluid dynamics (CFD) to understand how birds 'reject' gusts through wing morphing, i.e. by changing the shape and posture of their wings.

In the experiment, conducted in the Structure and Motion Laboratory at the Royal Veterinary College, the team filmed Lily, a barn owl, gliding through a range of fan-generated vertical gusts, the strongest of which was as fast as her flight speed. Lily is a trained falconry bird who is a veteran of many nature documentaries, so wasn't fazed in the least by all the lights and cameras.

VIDEO Lily the barn owl is filmed flying through a series of gusts. Credit: Cheney et al 2020
https://phys.org/news/2020-10-lily-barn-owl-reveals-birds.html

"We began with very gentle gusts in case Lily had any difficulties, but soon found that—even at the highest gust speeds we could make—Lily was unperturbed; she flew straight through to get the food reward being held by her trainer, Lloyd Buck," commented Professor Richard Bomphrey of the Royal Veterinary College.

"Lily flew through the bumpy gusts and consistently kept her head and torso amazingly stable over the trajectory, as if she was flying with a suspension system. When we analysed it, what surprised us was that the suspension-system effect wasn't just due to aerodynamics, but benefited from the mass in her wings. For reference, each of our upper limbs is about 5% of our body weight; for a bird it's about double, and they use that mass to effectively absorb the gust," said lead-author Dr. Jorn Cheney from the Royal Veterinary College.


"Perhaps most exciting is the discovery that the very fastest part of the suspension effect is built into the mechanics of the wings, so birds don't actively need to do anything for it to work. The mechanics are very elegant. When you strike a ball at the sweetspot of a bat or racquet, your hand is not jarred because the force there cancels out. Anyone who plays a bat-and-ball sport knows how effortless this feels. A wing has a sweetspot, just like a bat. Our analysis suggests that the force of the gust acts near this sweetspot and this markedly reduces the disturbance to the body during the first fraction of a second. The process is automatic and buys just enough time for other clever stabilising processes to kick in," added Dr. Jonathan Stevenson from the University of Bristol.

Dr. Windsor said the next step for the research, which was funded by the European Research Council (ERC), Air Force Office of Scientific Research and the Wellcome Trust, is to develop bio-inspired suspension systems for small-scale aircraft.


Explore furtherCollapsible wings help birds cope with turbulence
More information: Bird wings act as a suspension system that rejects gusts, Proceedings of the Royal Society B, rspb.royalsocietypublishing.or … .1098/rspb.2020.1748
Journal information: Proceedings of the Royal Society B
PACIFIC MORTHWEST NA
Geologists 'resurrect' missing tectonic plate

by Sara Tubbs, University of Houston
 
(l-r) Jonny Wu, assistant professor of geology in the UH Department of Earth and Atmospheric Sciences and Spencer Fuston, a third-year geology doctoral student, applied a technique developed by the UH Center for Tectonics and Tomography called slab unfolding to reconstruct what tectonic plates in the Pacific Ocean looked like during the early Cenozoic Era. Credit: University of Houston

The existence of a tectonic plate called Resurrection has long been a topic of debate among geologists, with some arguing it was never real. Others say it subducted—moved sideways and downward—into the earth's mantle somewhere in the Pacific Margin between 40 and 60 million years ago.


A team of geologists at the University of Houston College of Natural Sciences and Mathematics believes they have found the lost plate in northern Canada by using existing mantle tomography images—similar to a CT scan of the earth's interior. The findings, published in Geological Society of America Bulletin, could help geologists better predict volcanic hazards as well as mineral and hydrocarbon deposits.

"Volcanoes form at plate boundaries, and the more plates you have, the more volcanoes you have," said Jonny Wu, assistant professor of geology in the Department of Earth and Atmospheric Sciences. "Volcanoes also affect climate change. So, when you are trying to model the earth and understand how climate has changed since time, you really want to know how many volcanoes there have been on earth."

Wu and Spencer Fuston, a third-year geology doctoral student, applied a technique developed by the UH Center for Tectonics and Tomography called slab unfolding to reconstruct what tectonic plates in the Pacific Ocean looked like during the early Cenozoic Era. The rigid outermost shell of Earth, or lithosphere, is broken into tectonic plates and geologists have always known there were two plates in the Pacific Ocean at that time called Kula and Farallon. But there has been discussion about a potential third plate, Resurrection, having formed a special type of volcanic belt along Alaska and Washington State.

 
This image shows plate tectonic reconstruction of western North America 60 million years ago showing subduction of three key tectonic plates, Kula, Farallon and Resurrection. Credit: Spencer Fuston and Jonny Wu, University of Houston Dept. of Earth and Atmospheric Sciences in the College of Natural Sciences and Mathematics
 
A 3D block diagram across North America showing a mantle tomography image reveals the Slab Unfolding method used to flatten the Farallon tectonic plate. By doing this, Fuston and Wu were able to locate the lost Resurrection plate. Credit: Spencer Fuston and Jonny Wu, University of Houston Dept. of Earth and Atmospheric Sciences in the College of Natural Sciences and Mathematics
 
"We believe we have direct evidence that the Resurrection plate existed. We are also trying to solve a debate and advocate for which side our data supports," Fuston said.

Using 3-D mapping technology, Fuston applied the slab unfolding technique to the mantle tomography images to pull out the subducted plates before unfolding and stretching them to their original shapes.

Credit: University of Houston

"When 'raised' back to the earth's surface and reconstructed, the boundaries of this ancient Resurrection tectonic plate match well with the ancient volcanic belts in Washington State and Alaska, providing a much sought after link between the ancient Pacific Ocean and the North American geologic record," explained Wu.


Crack in Pacific seafloor caused volcanic chain to go dormant
More information: Spencer Fuston et al, Raising the Resurrection plate from an unfolded-slab plate tectonic reconstruction of northwestern North America since early Cenozoic time, GSA Bulletin (2020). DOI: 10.1130/B35677.1
Provided by University of Houston

Hot-button words trigger conservatives and liberals differently

by Yasmin Anwar, University of California - Berkeley
  
Graphic shows differences in liberal and conservative brain responses to news media Credit: Yuan Chang Leong

How can the partisan divide be bridged when conservatives and liberals consume the same political content, yet interpret it through their own biased lens?

Researchers from the University of California, Berkeley, Stanford University and Johns Hopkins University scanned the brains of more than three dozen politically left- and right-leaning adults as they viewed short videos involving hot-button immigration policies, such as the building of the U.S.-Mexico border wall, and the granting of protections for undocumented immigrants under the federal Deferred Action for Childhood Arrivals (DACA) program.

Their findings, published today in the Proceedings of the National Academy of Sciences journal, show that liberals and conservatives respond differently to the same videos, especially when the content being viewed contains vocabulary that frequently pops up in political campaign messaging.

"Our study suggests that there is a neural basis to partisan biases, and some language especially drives polarization," said study lead author Yuan Chang Leong, a postdoctoral scholar in cognitive neuroscience at UC Berkeley. "In particular, the greatest differences in neural activity across ideology occurred when people heard messages that highlight threat, morality and emotions."

Overall, the results offer a never-before-seen glimpse into the partisan brain in the weeks leading up to what is arguably the most consequential U.S. presidential election in modern history. They underscore that multiple factors, including personal experiences and the news media, contribute to what the researchers call "neural polarization."

"Even when presented with the same exact content, people can respond very differently, which can contribute to continued division," said study senior author Jamil Zaki, a professor of psychology at Stanford University. "Critically, these differences do not imply that people are hardwired to disagree. Our experiences, and the media we consume, likely contribute to neural polarization."


Specifically, the study traces the source of neural polarization to a higher-order brain region known as the dorsomedial prefrontal cortex, which is believed to track and make sense of narratives, among other functions.

Another key finding is that the closer the brain activity of a study participant resembles that of the "average liberal" or the "average conservative," as modeled in the study, the more likely it is that the participant, after watching the videos, will adopt that particular group's position.

"This finding suggests that the more participants adopt the conservative interpretation of a video, the more likely they are to be persuaded to take the conservative position, and vice versa," Leong said.

Leong and fellow researchers launched the study with a couple of theories about how people with different ideological biases would differ in the way they process political information. They hypothesized that if sensory information, like sounds and visual imagery, drove polarization, they would observe differences in brain activity in the visual and auditory cortices.

However, if the narrative storytelling aspects of the political information people absorbed in the videos drove them apart ideologically, the researchers expected to see those disparities also revealed in higher-order brain regions, such as the prefrontal cortex. And that theory panned out.
 
Study shows conservative-liberal disparity in brain response to hot-button vocabulary.
 Credit: Yuan Chang Leong

To establish that attitudes toward hardline immigration policies predicted both conservative and liberal biases, the researchers first tested questions out on 300 people recruited via the Amazon Mechanical Turk online marketplace who identified, to varying degrees, as liberal, moderate or conservative.

They then recruited 38 young and middle-aged men and women with similar socio-economic backgrounds and education levels who had rated their opposition or support for controversial immigration policies, such as those that led to the U.S.-Mexico border wall, DACA protections for undocumented immigrants, the ban on refugees from majority-Muslim countries coming to the U.S. and the cutting of federal funding to sanctuary cities.

Researchers scanned the study participants' brains via functional Magnetic Resonance Imaging (fMRI) as they viewed two dozen brief videos representing liberal and conservative positions on the various immigration policies. The videos included news clips, campaign ads and snippets of speeches by prominent politicians.

After each video, the participants rated on a scale of one to five how much they agreed with the general message of the video, the credibility of the information presented and the extent to which the video made them likely to change their position and to support the policy in question.

To calculate group brain responses to the videos, the researchers used a measure known as inter-subject correlation, which can be used to measure how similarly two brains respond to the same message.

Their results showed a high shared response across the group in the auditory and visual cortices, regardless of the participants' political attitudes. However, neural responses diverged along partisan lines in the dorsomedial prefrontal cortex, where semantic information, or word meanings, are processed.

Next, the researchers drilled down further to learn what specific words were driving neural polarization. To do this, they edited the videos into 87 shorter segments and placed the words in the segments into one of 50 categories. Those categories included words related to morality, emotions, threat and religion.

The researchers found that the use of words related to risk and threat, and to morality and emotions, led to greater polarization in the study participants' neural responses.

An example of a risk-related statement was, "I think it's very dangerous, because what we want is cooperation amongst the cities and the federal government to ensure that we have safety in our communities, and to ensure that our citizens are protected."

Meanwhile, an example of a moral-emotional statement was, "What are the fundamental ethical principles that are the basis of our society? Do no harm, and be compassionate, and this federal policy violates both of these principles."

Overall, the research study's results suggest that political messages that use threat-related and moral-emotional language drive partisans to interpret the same message in opposite ways, contributing to increasing polarization, Leong said.

Going forward, Leong hopes to use neuroimaging to build more precise models of how political content is interpreted and to inform interventions aimed at narrowing the divide between conservatives and liberals.


Bringing people on both sides of the aisle together on climate change
More information: Yuan Chang Leong et al, Conservative and liberal attitudes drive polarized neural responses to political content, PNAS first published October 20, 2020; doi.org/10.1073/pnas.2008530117
Predicting tornadoes on UK cold fronts for the first time

by University of Leeds
 
Tornado damage on 17 November 2016, near Crewgreen, Shropshire Credit: Matthew Clark

Weather forecasters can more accurately predict when a tornado is likely to hit the UK thanks to a new tool devised in a partnership between the University of Leeds and the Met Office.

Around 30 tornadoes occur in the UK each year, 40% of which develop on cold fronts—but a lack of forecasting methods for these conditions means they strike without warning.

Now researchers at Leeds and the Met Office have for the first time created a prediction for how likely tornadoes are to occur on cold fronts, meaning a more accurate assessment of tornado risk can be made before a cold front crosses the UK.

Matthew Clark, a Met Office scientist who is currently studying for a Ph.D. at Leeds's School of Earth and Environment, said: "Tornadoes are a relatively common weather hazard on UK cold fronts, but the Met Office have never before had any way of predicting which cold fronts are likely to produce tornadoes, nor did we understand why tornadoes occurred in some fronts but not others.

"These findings should help to improve the UK forecasts of localized, intense wind damage associated with these kinds of weather system. This should enable organizations and people to take precautions and minimize damage and risk."
  
Damage caused by a tornado which struck on 17 November, 2016, in Ternhill, Shropshire Credit: Matthew Clark

Mr Clark and Douglas Parker, Professor of Meteorology at Leeds' School of Earth and Environment, analyzed tornado reports from the Tornado and Storm Research Organisation (TORRO), radar imagery and surface analysis charts from 114 weather events over a 35 year period. One such event was the largest tornado outbreak in European history when 104 tornadoes touched down across England and Wales on 23 November, 1981, leaving a trail of damage in their wake.

The researchers identified patterns across the weather events, establishing which cold fronts were likely to produce a single tornado, which could produce several, and which would produce none. The research found that most of these tornadoes form when a region of strong winds approaches the front from the cold side. This creates a bulge in the front which helps to make it sharper, increasing the contrast in wind speed and direction across the front. Where this contrast increases over time, tornadoes are more likely to "spin up" along the front. Occasionally, relatively large outbreaks of tornadoes can occur in this situation. Forecasters can recognize these weather patterns, which alert them to the general risk of a tornado.

Clark and Parker also used their findings to create a predictive tool, which is already being used on an experimental basis by the Met Office to pinpoint regions at increased risk of tornadoes. Using the wind fields ahead and behind the cold front, forecasters can now compute a percentage probability that tornadoes will happen.

The tool is currently being tested in the Met Office, and was put to use on 29 February this year, successfully predicting the risk of tornadoes in southeast England, with a tornado occurring in Kent as the cold front swept through during the morning. Although use of the product is experimental at the moment, it is hoped that in time it will allow for appropriate messaging to be issued to local responders and other organizations such as airports.

Met Office Chief Meteorologist Paul Davies said: "By explaining, for the first time, "how" and "why" tornadoes form in a given weather system, meteorologists are much better prepared to anticipate events in advance, to interpret and challenge the results of numerical weather prediction models, and to communicate their confidence in a given forecast."

New map of the UK pinpoints tornado hotspots for the first time in two decades
More information: Matthew R. Clark et al, Synoptic‐scale and mesoscale controls for tornadogenesis on cold fronts: A generalised measure of tornado risk and identification of synoptic types, Quarterly Journal of the Royal Meteorological Society (2020). DOI: 10.1002/qj.3898
Provided by University of Leeds
Chemists develop new material for the separation of carbon dioxide from industrial waste gases

by University of Bayreuth
  
Electron microscopic cross-sectional image of the new hybrid material. It was possible to produce the glass platelets very precisely and, interrupted by spacers, to layer them on top of each other. Credit: Martin RieĂź

Chemists at the University of Bayreuth have developed a material that could well make an important contribution to climate protection and sustainable industrial production. With this material, the greenhouse gas carbon dioxide (CO₂) can be specifically separated from industrial waste gases, natural gas, or biogas, and thereby made available for recycling. The separation process is both energy efficient and cost-effective. In the journal Cell Reports Physical Science the researchers present the structure and function of the material.


The Green Deal presented by the European Commission in 2019 calls for the net emissions of greenhouse gases within the EU to be reduced to zero by 2050. This requires innovative processes that can separate and retain CO2from waste gases and other gas mixtures so that it is not released into the atmosphere. The material developed in Bayreuth has one fundamental advantage over previous separation processes: It is capable of completely removing CO2from gas mixtures without chemically binding CO2.

These gas mixtures can be waste gases from industrial plants, but also natural gas or biogas. In all these cases, CO2accumulates in the cavities of the material solely due to physical interaction. From there, it can be released without great expenditure of energy, to be made available again as a resource for industrial production. Hence, the separation process works, chemically speaking, according to the principle of physical adsorption. Like a spacious storage tank, the new material can be filled with and emptied of carbon dioxide in an energy-efficient way. In Bayreuth laboratories, it was designed in such a way as to only separate out CO2and no other gas from the most varied gas mixtures.

"Our research team has succeeded in designing a material that fulfils two tasks at the same time. On the one hand, the physical interactions with CO2are strong enough to free and retain this greenhouse gas from a gas mixture. On the other hand, however, they are weak enough to allow the release of CO2from the material with only a small amount of energy," says Martin RieĂź M.Sc., first author of the new publication and doctoral researcher at the Inorganic Chemistry I research group at the University of Bayreuth.

The new material is an inorganic-organic hybrid. The chemical basis is clay minerals consisting of hundreds of individual glass platelets. These are only one nanometre thick each, and arranged precisely one above the other. Between the individual glass plates there are organic molecules that act as spacers. Their shape and chemical properties have been selected so that the pore spaces created are optimally tailored to accumulate CO2. Only carbon dioxide molecules can penetrate into the pore system of the material and be retained there. In contrast, methane, nitrogen, and other exhaust gas components must remain outside due to the size of their molecules. The researchers have used the so-called molecular sieve effect to increase the material's selectivity for CO2. They are currently working on the development of a membrane system based on clay minerals, designed to allow the continuous, selective, and energy-efficient separation of CO2 from gas mixtures.

The development of a hybrid material tailor-made for the separation and supply of CO2was made possible thanks to a special measuring system set up in the Bayreuth laboratories which allows the precise determination of quantities of adsorbed gases and of the selectivity of the adsorbing material. This has enabled industrial processes to be reproduced realistically. "All criteria relevant to the evaluation of industrial CO2separation processes have been completely fulfilled by our hybrid material. It can be produced cost-effectively, and stands to make an important contribution to reducing industrial carbon dioxide emissions, but also to the processing of biogas and acidic natural gas," says RieĂź.

A controllable membrane to pull carbon dioxide out of exhaust streams
More information: Martin RieĂź et al. Diammonium-Pillared MOPS with Dynamic CO2 Selectivity, Cell Reports Physical Science (2020). DOI: 10.1016/j.xcrp.2020.100210

A controllable membrane to pull carbon dioxide out of exhaust streams


by David L. Chandler, Massachusetts Institute of Technology
 
Credit: CC0 Public Domain

A new system developed by chemical engineers at MIT could provide a way of continuously removing carbon dioxide from a stream of waste gases, or even from the air. The key component is an electrochemically assisted membrane whose permeability to gas can be switched on and off at will, using no moving parts and relatively little energy.


The membranes themselves, made of anodized aluminum oxide, have a honeycomb-like structure made up of hexagonal openings that allow gas molecules to flow in and out when in the open state. However, gas passage can be blocked when a thin layer of metal is electrically deposited to cover the pores of the membrane. The work is described in the journal Science Advances, in a paper by Professor T. Alan Hatton, postdoc Yayuan Liu, and four others.

This new "gas gating" mechanism could be applied to the continuous removal of carbon dioxide from a range of industrial exhaust streams and from ambient air, the team says. They have built a proof-of-concept device to show this process in action.

The device uses a redox-active carbon-absorbing material, sandwiched between two switchable gas gating membranes. The sorbent and the gating membranes are in close contact with each other and are immersed in an organic electrolyte to provide a medium for zinc ions to shuttle back and forth. These two gating membranes can be opened or closed electrically by switching the polarity of a voltage between them, causing ions of zinc to shuttle from one side to the other. The ions simultaneously block one side, by forming a metallic film over it, while opening the other, by dissolving its film away.

When the sorbent layer is open to the side where the waste gases are flowing by, the material readily soaks up carbon dioxide until it reaches its capacity. The voltage can then be switched to block off the feed side and open up the other side, where a concentrated stream of nearly pure carbon dioxide is released.

By building a system with alternating sections of membrane that operate in opposite phases, the system would allow for continuous operation in a setting such as an industrial scrubber. At any one time, half of the sections would be absorbing the gas while the other half would be releasing it.

"That means that you have a feed stream coming into the system at one end and the product stream leaving from the other in an ostensibly continuous operation," Hatton says. "This approach avoids many process issues" that would be involved in a traditional multicolumn system, in which adsorption beds alternately need to be shut down, purged, and then regenerated, before being exposed again to the feed gas to begin the next adsorption cycle. In the new system, the purging steps are not required, and the steps all occur cleanly within the unit itself.


The researchers' key innovation was using electroplating as a way to open and close the pores in a material. Along the way the team had tried a variety of other approaches to reversibly close pores in a membrane material, such as using tiny magnetic spheres that could be positioned to block funnel-shaped openings, but these other methods didn't prove to be efficient enough. Metal thin films can be particularly effective as gas barriers, and the ultrathin layer used in the new system requires a minimal amount of the zinc material, which is abundant and inexpensive.

"It makes a very uniform coating layer with a minimum amount of materials," Liu says. One significant advantage of the electroplating method is that once the condition is changed, whether in the open or closed position, it requires no energy input to maintain that state. Energy is only required to switch back again.

Potentially, such a system could make an important contribution toward limiting emissions of greenhouse gases into the atmosphere, and even direct-air capture of carbon dioxide that has already been emitted.

While the team's initial focus was on the challenge of separating carbon dioxide from a stream of gases, the system could actually be adapted to a wide variety of chemical separation and purification processes, Hatton says.

"We're pretty excited about the gating mechanism. I think we can use it in a variety of applications, in different configurations," he says. "Maybe in microfluidic devices, or maybe we could use it to control the gas composition for a chemical reaction. There are many different possibilities."


Lego-like assembly of zeolitic membranes improves carbon capture
More information: Electrochemically mediated gating membrane with dynamically controllable gas transport, Science Advances (2020). advances.sciencemag.org/lookup … .1126/sciadv.abc1741
Journal information: Science Advances


Provided by Massachusetts Institute of Technology

This story is republished courtesy of MIT News (web.mit.edu/newsoffice/), a popular site that covers news about MIT research, innovation and teaching.
What cold lizards in Miami can tell us about climate change resilience

by Washington University in St. Louis
  
Central American brown basilisks (Basiliscus vittatus) are among the members of a lizard community that converged on a lower temperature tolerance after a cold snap in Miami. Credit: Day's Edge Productions

It was raining iguanas on a sunny morning.

Biologist James Stroud's phone started buzzing early on Jan. 22. A friend who was bicycling to work past the white sands and palm tree edges of Key Biscayne, an island town south of Miami, sent Stroud a picture of a 2-foot long lizard splayed out on its back. With its feet in the air, the iguana took up most of the sidewalk.

The previous night was south Florida's coldest in 10 years, at just under 40 degrees Fahrenheit. While most people reached for an extra blanket or a pair of socks, Stroud—a postdoctoral research associate in Arts & Sciences at Washington University in St. Louis—frantically texted a collaborator:

"Today's the day to drop everything, go catch some lizards."

When temperatures go below a critical limit, sleeping lizards lose their grip and fall out of trees. From previous research, Stroud and his colleagues had learned that different types of lizards in Miami can tolerate different low temperatures, ranging from about 46 to 52 degrees Fahrenheit, before they are stunned by cold. This cold snap provided a unique opportunity to understand how they are affected by extreme climate events.

But when the researchers collected the scaled survivors of that coldest night, they discovered that the lizard community responded in an unexpected way: all of them could tolerate cold temperatures down to about 42 degrees Fahrenheit, regardless of their species' previous ability to withstand cold. The findings are reported Oct. 21 in the journal Biology Letters.

"Prior to this, and for a different study, we had measured the lowest temperatures that six lizard species in south Florida could tolerate," Stroud said. "We realized after the 2020 cold event that these data were now extremely valuable—we had the opportunity to re-measure the same lizard populations to observe if their physiological limits had changed; in other words, could these species now tolerate lower temperatures?"


In the days that followed the January cold snap, researchers collected representatives of as many different kinds of lizards as they could find in the local area, rounding up small and large lizards and those that are active during the day and at night. Then the researchers tested their response to cold.

"A major unexpected result of this study was that all species converged on the same new, lower level of thermal tolerance," Stroud said. "While there was great variation in temperature tolerance before the cold event—some, like the large-bodied brown basilisk, were very intolerant of low temperatures, while others like the Puerto Rican crested anole were more robust—we observed that all species could now tolerate, on average, the same lowest temperature.

"Given great variation in body size, ecology and physiology, this was unexpected," he said.
  
On January 21, 2020, the National Weather Service in Miami tweeted: "Falling Iguanas Possible Tonight" Credit: National Weather Service / Miami

Only one of the species in the study is native to the area; the rest have been introduced to Florida over the past century, researchers noted.

The results provide evidence that tropical, cold-blooded creatures—often characterized as unable to withstand rapid changes in climatic conditions—can sometimes endure conditions that exceed their established physiological limits.

"The shifts to tolerate significantly lower temperatures that we observed were so large that we found it unclear whether natural selection was responsible," Stroud said. "And so in our paper we discuss other alternative processes which may also have led to this pattern."

"The results of this study are surprising and unexpected. Who would have thought that tropical lizards from places like Puerto Rico and Central America could withstand temperatures near freezing?" said Jonathan Losos, the William H. Danforth Distinguished University Professor and professor of biology in Arts & Sciences and director of the Living Earth Collaborative at Washington University.

"What we now need to find out is how this was accomplished. Is this evidence of natural selection, with those lizards that just happened to have a lower cold tolerance surviving and others freezing to death, or was it an example of physiological adjustment—termed 'acclimation'— in which exposure to lower temperatures changes a lizard's physiology so that it is capable of withstanding lower temperatures?"

Regardless of the underlying mechanism, the new study provides a critically important piece of information for understanding the impacts of climate change.

Scientists expect that air temperatures will gradually become warmer under climate change, but also that temperatures will become more chaotic.

Events that spike temperature to extremes—both exceptionally hot and exceptionally cold episodes—will increase in frequency and magnitude. As such, it is important to understand both the effects of gradual, long-term increases in air temperatures as well as the consequences of abrupt, short-term extreme events.

"It is widely thought that tropical and subtropical species are going to be especially vulnerable to changes in temperature—particularly extreme spikes of heat or cold—as tropical areas do not typically have strong seasons," Stroud said. "Unlike temperate species, which are adapted to summer highs and winter lows, tropical species have typically evolved in very thermally stable environments.

"While there is no doubt that climate change represents a major threat to species and ecosystems around the world, and deserves as much research attention as possible, this study provides fascinating insight and a glimpse of hope," he said. "Perhaps tropical and subtropical species can withstand more extreme climatic conditions."


Hummingbird reduces its body temperature during nightly torpor
More information: An extreme cold event leads to community-wide convergence in lower temperature tolerance in a lizard community, Biology Letters (2020). royalsocietypublishing.org/doi … .1098/rsbl.2020.0625

Journal information: Biology Letters

Provided by Washington University in St. Louis