Tropical forests can handle the heat, up to a point

UNIVERSITY OF LEEDS

 

IMAGE: A VIEW FROM THE CANOPY AT GUNUNG MULU'S HEATH FOREST, DOMINATED BY SHOREA ALBIDA. SARAWAK, BORNEO. view more 

CREDIT: DR LINDSAY F. BANIN

l forests face an uncertain future under climate change, but new research published in Science suggests they can continue to store large amounts of carbon in a warmer world, if countries limit greenhouse gas emissions.

The world's tropical forests store a quarter-century worth of fossil fuel emissions in their trees alone. There are fears that global heating can reduce this store if tree growth reduces or tree death increases, accelerating climate change.

An international research team measured over half a million trees in 813 forests across the tropics to assess how much carbon is stored by forests growing under different climatic conditions today.

The team reveal that tropical forests continue to store high levels of carbon under high temperatures, showing that in the long run these forests can handle heat up to an estimated threshold of 32 degrees Celsius in daytime temperature.

Yet this positive finding is only possible if forests have time to adapt, they remain intact, and if global heating is strictly limited to avoid pushing global temperatures into conditions beyond the critical threshold.

Lead author Dr Martin Sullivan, from the University of Leeds and Manchester Metropolitan University, said: "Our analysis reveals that up to a certain point of heating tropical forests are surprisingly resistant to small temperature differences. If we limit climate change they can continue to store a large amount of carbon in a warmer world.

"The 32 degree threshold highlights the critical importance of urgently cutting our emissions to avoid pushing too many forests beyond the safety zone.

"For example, if we limit global average temperatures to a 2°C increase above pre-industrial levels this pushes nearly three-quarters of tropical forests above the heat threshold we identified. Any further increases in temperature will lead to rapid losses of forest carbon.

Collecting tree species for identification, Andean cloud forest in Peru 2011

CREDIT Jake Bryant

Forests release carbon dioxide into the atmosphere when the amount of carbon gained by tree growth is less than that lost through tree mortality and decay.

The study is the first to analyse long-term climate sensitivity based on direct observation of whole forests across the topics. The research suggests that over the long-term, temperature has the greatest effect on forest carbon stocks by reducing growth, with drought killing trees the second key factor.

The researchers conclude that tropical forests have long-term capacity to adapt to some climate change, in part because of their high biodiversity as tree species better able to tolerate new climatic conditions grow well and replace less well-adapted species over the long-term.

But maximizing this potential climate resilience depends on keeping forests intact.

Colombia, measuring giant Ceiba in the Choco rainforest.

CREDIT Pauline Kindler

Co-author Professor Beatriz Marimon from the State University of Mato Grosso in Brazil studies some of the world's hottest tropical forests in central Brazil. She noted: "Our results suggest that intact forests are able to withstand some climate change. Yet these heat-tolerant trees also face immediate threats from fire and fragmentation.

"Achieving climate adaptation means first of all protecting and connecting the forests that remain."

Professor Marimon notes the clear limits to adaptation. "The study indicates a heat threshold of 32 degrees Celsius in daytime temperature. Above this point tropical forest carbon declines more quickly with higher temperatures, regardless of which species are present.

"Each degree increase above this 32 degree threshold releases four-times as much carbon dioxide as would have been released below the threshold."

The insights into how the world's tropical forests respond to climate were only possible with decades of careful fieldwork, often in remote locations. The global team of 225 researchers combined forests observations across South America (RAINFOR), Africa (AfriTRON) and Asia (T-FORCES). In each monitoring plot the diameter of each tree and its height was used to calculate how much carbon they stored. Plots were revisited every few years to see how much carbon was being taken in, and how long it was stored before trees died.

To calculate changes in carbon storage required identifying nearly 10,000 tree species and over two million measurements of tree diameter, across 24 tropical countries. According to Professor Simon Lewis of the University of Leeds and University College London: "The amount of carbon absorbed and stored by forests is a crucial element in how the Earth responds to climate change."

"The study underlines why long-term research collaboration is essential for understanding the effects of environmental change. Scientists need to work together more than ever, as monitoring the health of our planet's great tropical forests is vital for all of us."

Cutting carbon emissions enough to keep forests within the safety zone will be very challenging. Study author Professor Oliver Phillips of the University of Leeds said: "Keeping our planet and ourselves healthy has never been more important. Right now, humanity has a unique opportunity to make the transition toward a stable climate.

"By not simply returning to 'business as usual' after the current crisis we can ensure tropical forests remain huge stores of carbon. Protecting them from climate change, deforestation and wildlife exploitation needs to be front and centre of our global push for biosecurity.

"Imagine if we take this chance to reset how we treat our Earth. We can keep our home cool enough to protect these magnificent forests - and keep all of us safer."

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Further information:

The paper Long-term thermal sensitivity of Earth's tropical forests is published in Science 22 May 2020 (Embargo 21 May 19:00 BST/ 14:00 ET) (DOI: 10.1126/science.aaw7578)

Link to images/video (captions and credits included) : https://drive.google.com/open?id=1ZJLFfqJfJWyfQRjD1iknLnZTrbk7Nr9u

For additional information or to arrange interviews please contact University of Leeds press officer Anna Harrison at a.harrison@leeds.ac.uk

Press release translations in Spanish, Portuguese and French available.

University of Leeds

The University of Leeds is one of the largest higher education institutions in the UK, with more than 38,000 students from more than 150 different countries, and a member of the Russell Group of research-intensive universities. The University plays a significant role in the Turing, Rosalind Franklin and Royce Institutes.

We are a top ten university for research and impact power in the UK, according to the 2014 Research Excellence Framework, and are in the top 100 of the QS World University Rankings 2020.

The University was awarded a Gold rating by the Government's Teaching Excellence Framework in 2017, recognising its 'consistently outstanding' teaching and learning provision. Twenty-six of our academics have been awarded National Teaching Fellowships - more than any other institution in England, Northern Ireland and Wales - reflecting the excellence of our teaching. http://www.leeds.ac.uk

Hearts that drum together beat together

Group drumming stimulates behavioral and physiological synchronization that contribute to the formation of social bonds and a consequent ability to cooperate, Bar-Ilan University study finds

THE WELCOMING DRUMMING OF PAGAN CIRCLES

BAR-ILAN UNIVERSITY

 

Group work and cooperation are crucial in everyday life. As such, it is important to explore the avenues by which synchrony within a group may enhance cohesion and influence performance.

What role can music play in this effort? In an interdisciplinary study published today in the journal Scientific Reports researchers report their discovery that while drumming together, aspects of group members' heart function - specifically the time interval between individual beats (IBI) -- synchronized.

This physiological synchronization was recorded during a novel musical drumming task that was especially developed for the study in a collaboration between social-neuroscientists and scholars from the Music Department at Israel's Bar-Ilan University.

The drumming involved 51 three-participant groups in which IBI data were continuously collected. Participants were asked to match their drumming -- on individual drumming pads within an electronic drum set shared by the group -- to a tempo that was presented to the group through speakers. For half of the groups, the tempo was steady and predictable, and thus, the resulting drumming and its output were intended to be synchronous. For the other half, the tempo changed constantly and was practically impossible to follow, so that the resulting drumming and musical output would be asynchronous. The task enabled the researchers to manipulate the level of behavioral synchronization in drumming between group members and assess the dynamics of changes in IBI for each participant throughout the experiment.

Following this structured drumming task, participants were asked to improvise drumming freely together. The groups with high physiological synchrony in the structured task showed more coordination in drumming in the free improvisation session.

Analysis of the data demonstrated that the drumming task elicited an emergence of physiological synchronization in groups beyond what could be expected randomly. Further, behavioral synchronization and enhanced physiological synchronization while drumming each uniquely predicts a heightened experience of group cohesion. Finally, the researchers showed that higher physiological synchrony also predicts enhanced group performance later on in a different group task.

"Our results present a multi-modal behavioral and physiological account of how synchronization contributes to the formation of the group bond and its consequent ability to cooperate," says Dr. Ilanit Gordon, head of the Social Neuroscience Lab at Bar-Ilan University's Department of Psychology and a senior researcher at the University's Gonda (Goldschmied) Multidisciplinary Brain Research Center, who led the study together with Prof. Avi Gilboa and Dr. Shai Cohen, of the Department of Music. "A manipulation in behavioral synchrony and emerging physiological coordination in IBI between group members predicts an enhanced sense of cohesion among group members."

"We believe that joint music making constitutes a promising experimental platform for implementing ecological and fully interactive scenarios that capture the richness and complexity of human social interaction," says Prof. Gilboa, of the Department of Music, who co-authored the study. "These results are particularly significant due to the crucial importance of groups to action, identity and social change in our world."

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This study was supported by a grant from the Israel Science Foundation.

Can oilfield water safely be reused for irrigation in California?

It depends on the location, concludes a study of one California water district

DUKE UNIVERSITY

 

IMAGE: MANY FARM FIELDS IN THE CAWELO WATER DISTRICT OF CALIFORNIA HAVE BEEN IRRIGATED WITH REUSED OILFIELD WATER MIXED WITH SURFACE WATER FOR 25 YEARS. A NEW DUKE-LED STUDY FINDS THE... view more 

CREDIT: AVNER VENGOSH, DUKE UNIVERSITY

DURHAM, N.C. - A new study by researchers at Duke University and RTI International finds that reusing oilfield water that's been mixed with surface water to irrigate farms in the Cawelo Water District of California's Kern County does not pose major health risks, as some opponents of the practice have feared.

"We did not find any major water quality issues, nor metals and radioactivity accumulation in soil and crops, that might cause health concerns," said Avner Vengosh, professor of water quality and geochemistry at Duke's Nicholas School of the Environment, whose lab led the new study.

Faced with increasing droughts and water shortages, some farmers in the Cawelo district have used diluted oilfield produced water (OPW) for irrigation for their fields for more than 25 years, as permitted under California Water Board policy.

While the oilfield-mixed water contains slightly elevated levels of salts and boron relative to the local groundwater, those levels are still below the standards set by the state for safe drinking water and irrigation in the Cawelo district, Vengosh said.

Boron and salts from the OPW have however, accumulated over time in the irrigated soil. The district's farmers will need to plant boron-tolerant crops and keep mixing the OPW with fresh water to avoid boron toxicity and salinity buildup in their fields, and also to remain within state guidelines. "But all things considered, this is good news," Vengosh said.

The researchers published their peer-reviewed findings May 18 in the journal Science of the Total Environment.

The new study should help allay fears that contaminants in the Cawelo OPW, which is produced as a byproduct of oil and gas extraction at sites adjacent to many farm fields in the district, could impact water and soil quality, harm crop health or pose risks to human health, the researchers said.

"Those concerns assumed that the OPW generated by oil and gas wells in the Cawelo district contains similar mixtures of salts, metals and naturally occurring radioactivity as OPW generated in oil fields in other regions. But our study shows that's not the case," said Andrew Kondash, a research environmental scientist at RTI International, who led the study as part of his 2019 doctoral dissertation at Duke.

"The OPW produced in Kern County is much more diluted and low-saline than common OPW from other parts of the country, so it can be used for irrigation if it is mixed with surface water," Kondash said.

Determining whether it is safe to use OPW for irrigation in other locations would require a similar suite of water and soil testing, Kondash said. "You can't assume that the results in this study could be applied to OPW from other oilfields, where the salinity is typically much higher."

To conduct the new study, the researchers collected and analyzed soil samples, irrigation water samples, OPW samples and groundwater samples from sites across the Cawelo Water District from December 2017 to September 2018 and analyzed them for a wide range of contaminants including, salts, metals and radioactive elements.

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The study was part of a research project funded by the U.S. Department of Agriculture National Institute of Food and Agriculture (grant #2017-68007-26308) and included a policy analysis section led by Erika Weinthal of Duke's Nicholas School.

Other authors were: Jennifer Hoponick Redmon and Elisabetta Lambertini of RTI International, Laura Feinstein of the Pacific Institute, and Luis Cabrales of California State University at Bakersfield.

In addition to earning his PhD in Earth and Ocean Sciences from Duke's Nicholas School, Kondash also earned a Master of Environmental Management degree in Energy and Environment at Duke in 2013.

CiTATION: "The Impact of Using Low-Saline Oilfield Produced Water for Irrigation on Water and Soil Quality in California," Andrew Kondash, Jennifer Hoponick Redmon, Elisabetta Lambertini, Laura Feinstein, Erika Weinthal, Luis Cabrales, and Avner Vengosh; May 18, 2020, Science of the Total Environment. DOI: 10.1016/j.scitotenv.2020.139392

Migration patterns reveal an Eden for ancient humans and animals

UNIVERSITY OF COLORADO DENVER

 

IMAGE: ANTELOPE IN SOUTH AFRICA view more 

CREDIT: N/A

Pinnacle Point, a series of archaeological sites that overlook a now submerged section of South Africa's coastline and one of the world's most important localities for the study of modern human origins, was as much of an Eden for animals as it was for early humans. Jamie Hodgkins, PhD, assistant professor of anthropology at University of Colorado Denver, and her team drilled ancient herbivore teeth to find that many local animals stayed put in the ecologically rich ecosystem, which may explain why humans flourished there, too.

Their study was published in a Quaternary Science Reviews special issue: The Palaeo-Agulhas Plain: a lost world and extinct ecosystem this month.

Home to the Earliest Modern Humans

Home to some of the richest evidence for the behavior and culture of the earliest clearly modern humans, the submerged shelf called the Palaeo-Agulhas Plain (PAP) once formed its own ecosystem. Co-author Curtis Marean, PhD, Arizona State University, has worked with teams of scientists for decades to reconstruct the locale back into the Pleistocene, the time period that spanned from 2.6 million to 11,700 years ago.

In this study, the researchers looked specifically at antelope migratory patterns at Pinnacle Point. This series of cave sites that sit on the modern South African coast offers archaeological materials from humans who were living and hunting there back to 170,000 years ago.

"During glacial cycles, the coastal shelf was exposed," said Hodgkins. "There would have been a huge amount of land in front of the cave sites. We thought it was likely that humans and carnivores were hunting animals as they migrated east and west over the exposed shelve."

A Lack of Migratory Pattern

Hodgkins and her team wanted to understand those migratory patterns. They studied the carbon and oxygen isotopes within the tooth enamel of many large herbivores, including Redunca, or reedbuck, a nonmigratory antelope. Tooth enamel can reveal a pattern of migration by tracking changing levels of carbon from the plants an animal eats as its teeth grow.

In general, wetter, cooler environments are home to C3 plants; hotter, drier environments are home to C4 plants. Animals like lush vegetation, which means they tend to follow the rain patterns: in this case east for summer rain (C4 grasses), and west for winter rain (C3 grasses). If animals were migrating between summer and winter rainfall zones, their tooth enamel would register that annual C3 and C4 plant rotation as a sinusoidal curve as their teeth grew.

A) Map of South Africa (SA) showing the distribution of C4 grasses associated with the percentage of summer rain from east to west along the coast, and with the winter rainfall zone in the west (modified from Vogel, 1978); B) A map of SA showing the area of the Greater Cape Floristic Region with the expanded PAP and hypothesized animals migration (i.e. It is hypothesized that animals would have been undertaking long-distance migrations between the east coast in summer rainfall zone and west coast in the winter rainfall zone)

But when Hodgkins and her team used the nonmigratory reedbuck as their control animal, they found that the enamel from its typically migratory pals--like the wildebeest, hartebeest, and springbok--showed no discernible migratory pattern. Most animals seemed happy right where they were.

"They weren't struggling at Pinnacle Point," says Hodgkins. "We now know that powerful river systems supplied the expanded coast, thus animals didn't have to be migratory. It was a great location, resource-wise. During interglacials when the coast moved closer to the caves humans had shellfish and other marine resources, and when the coast expanded in glacial times hunters had access to a rich, terrestrial environment. Hunters wouldn't need to be as mobile with all of these herbivores wandering around."

Thriving in an Ecogeological Haven

Hodgkins' team's findings of this prehistoric Eden echoed another recent discovery. Seventy-four-thousand years ago, one of Earth's largest known eruptions at Mount Toba in Sumatra, Indonesia, created a global winter, causing population crashes. In 2018, researchers from Marean's group found that humans at Pinnacle Point not only survived, but thrived in the haven.

Hodgkins says this is just a first attempt at using isotopic data to test the hypothesis of east and west migration patterns at these sites and further research will be done.

"It is quite possible that animal migration patterns changed as the coastline moved in and out during glacial and interglacial cycles," said Hodgkins.

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Funders for this project include the National Science Foundation, the Hyde Family Foundations, and the John Templeton Foundation at the Institute of Human Origins (IHO) at Arizona State University.

Earliest evidence of Italians' genetic diversity dates back to end of last glacial period

UNIVERSITÀ DI BOLOGNA

 

In Europe, Italians are the richest population in terms of genetic wealth. This is now common knowledge. The gradient of their genetic variability, scattered all over the peninsula, encloses on a small scale the whole genetic variance between southern and continental Europeans. This amazing diversity started to accumulate soon after the Late Glacial Maximum, which ended approximately 19,000 years ago.

This is what some researchers of the University of Bologna report in a paper published in the BMC Biology journal. It is the first time that a group of scientists is able to go so back in time in retracing Italians' genetic history. Results also show that there are some genetic peculiarities characterising people living in the north and south of Italy, that evolved in response to different environments. These peculiarities contribute to reducing, on the one hand, the risk of kidney inflammation and skin cancers, and, on the other hand, the risk of diabetes and obesity, favouring sometimes a longer lifespan.

"Gaining an understanding of the evolutionary history of the ancestors of Italians allows us to better grasp the demographic processes and those of environmental interactions that shaped the complex mosaic of ancestry components of today's European populations", explains Marco Sazzini, one of the principal investigators of this study and professor of Molecular Anthropology at the University of Bologna. "This investigation provides valuable information in order to fully appreciate the biological characteristics of the current Italian population. Moreover, it let us understand the deep causes that can impact on this population's health or on its predisposition to a number of diseases".

AN UNEXPECTED OUTCOME

To carry out this study, researchers sequenced the entire genome of forty participants, who were selected as representatives of the biological variability of the Italian population with a good approximation. The analysis brought to the fore more than 17 million genetic variants. Scientists then made a twofold comparison. First, they compared these data against the genetic variants observed in other 35 populations from Europe and from the Mediterranean. Second, they compared the same data against the genetic variants found in studies on almost 600 human remains dating from the Upper Palaeolithic (approx. 40,000 years ago) to the Bronze Age (approx. 4,000 years ago).

These comparisons reached such high levels of precision that it was possible, for the first time, to go way back in time in Italians' genetic history, extending the investigation to very remote time periods with respect to what achieved by previous studies. Eventually, this led to the identification of traces left in Italians' gene pool by events that just followed the last glaciation, which ended more or less 19,000 years ago.

The bulk of the scholarship in this field has so far suggested that the oldest events leaving a trace in Italians' DNA were the migrations that had taken place in the Neolithic and the Bronze Ages, between 7,000 and 4,000 years ago. The results of this study show, on the contrary, that the earliest biological adaptations to the environment and migrations underlying Italians' extraordinary genetic diversity are much older than previously thought.

CLIMATE CHANGES AND POST-GLACIAL MIGRATIONS

Researchers traced the evolutionary history of the two groups at the opposite ends of Italians' gradient of genetic variability. This means that they evaluated and measured differences between the gene pools of participants from southern and northern Italy and observed when these differences became evident.

"We observe some partially overlapping demographic trends among the ancestors of these two groups from 30,000 years ago and for the remaining years of the Upper Palaeolithic", illustrates Stefania Sarno, a researcher at the University of Bologna and one of the co-first authors of the paper. "However, we witness to a significant variation between their gene pools from the Late Glacial period, thus some thousands of years before those great migrations that happened in Italy from the Neolithic onwards".

Here, the main hypothesis is that with temperatures rising and, as a consequence, glaciers shrinking, some groups of people who made it through the glaciation period thanks to "glacial refugia" in central Italy, moved north and drifted away, and thus progressively isolating themselves, from the inhabitants of southern Italy.

The DNA of people living in northern Italy shows traces of these post-glacial migrations. If compared to individuals from southern Italy, Italians from the north present a close genetic relation to human remains attributed to ancient European cultures such as the Magdalenian and the Epigravettian cultures and dated respectively between 19,000 and 14,000 years ago and between 14,000 and 9,000 years ago. Moreover, in northern Italians' gene pool ancestry components even more ancient were observed, such as those proper of Eastearn European hunter-gatherers, which are thought to characterize all European populations between 36,000 and 26,000 years ago and that later on spread again to western Europe with migratory movements from "glacial refugia" during the Late Glacial period.

Conversely, in southern Italians, these post-glacial migrations traces seem to vanish, as more recent events significantly reshaped their gene pool. This is confirmed by their closer genetic relation with Neolithic human remains from Anatolia and the Middle East, and with Bronze-Age remains from the South Caucasus. Differently from the north of Italy, the south was the main hub for migratory movements, which firstly spread agriculture to the Mediterranean area during the Neolithic transition, and then, during Bronze Age, fostered a new ancestry component. The latter differs from the ancestry component associated with populations of the Eurasian steppe that spread during the same time across continental Europe and northern Italy.

GENETIC ADAPTATIONS: DIFFERENCES AND PECULIARITIES ACROSS ITALY

19,000 years ago, after the end of the Last Glacial Maximum, ancestors of northern and southern Italians started living in increasingly different environmental and ecological contexts, which gradually led to the emergence of differences and peculiarities in their gene pools.

For millennia, the populations resettling in northern Italy endured abrupt climate changes and environmental pressures similar to those of the Last Glacial Maximum. These circumstances brought to the evolution of specific biological adaptations. For instance, populations in northern Italy developed a metabolism optimized for a diet rich in calories and animal fat, which are essential to survive in cold climates. "In the subjects from northern Italy, we observed changes in the gene networks regulating insulin and body-heat production as well as in those responsible for fat tissue metabolism", says Paolo Garagnani, professor of Experimental Medicine and Pathophysiology at the University of Bologna. "These changes could have developed, today, in key factors reducing the susceptibility to diseases like diabetes and obesity".

While this was happening in northern Italy, in the south, a warmer climate exposed its populations to a different kind of environmental pressures. The genomes of people from southern Italy show changes in the genes encoding for mucins, which are proteins to be found in the mucous membranes of the respiratory and gastro-intestinal systems and that prevent pathogens to attack the tissues. "These genetic adaptations may have evolved in response to ancient micro-organisms", says Paolo Abondio, Ph.D. student at the University of Bologna and another co-first author of this study. "Some scholars have linked some of these genetic variants with a reduced susceptibility to Berger's disease, which is a common inflammation affecting the kidneys and is indeed less frequent in the south than in the north of Italy".

Researchers identified also other peculiarities in the genome of southern Italians. For example, there are some modifications in the genes regulating the production of melanin, the pigment that provides colour to the skin. Most probably, these alterations developed in response to more intense sun-light and to a higher number of sunny days that characterise the Mediterranean regions. In turn, these alterations may also have contributed to a lower incidence of skin cancers among southern Italians. "We observed that some of these genetic variants have been also linked to a longer lifespan. This is also true for other genetic modifications which are characteristic of southern Italians. These are found on genes involved in the arachidonic acid metabolism and on those encoding for FoxO transcription factors", according to Claudio Franceschi, Emeritus Professor of the University of Bologna.

THE AUTHORS OF THE STUDY

The study was led by professors of the University of Bologna, Marco Sazzini, Claudio Franceschi and Paolo Garagnani, in collaboration with Patrick Descombes (Nestlé Research Center, Lausanne, Switzerland) and Massimo Delledonne (University of Verona). A paper entitled "Genomic history of the Italian population recapitulates key evolutionary dynamics of both Continental and Southern Europeans" was then published in the BMC Biology journal.

The study featured researchers of the Molecular Anthropology Lab and the Centre for Genome Biology of the Department of Biological, Geological and Environmental Sciences at the University of Bologna: Marco Sazzini, Paolo Abondio, Stefania Sarno, co-first authors of the paper, and also Sara De Fanti, Claudia Ojeda-Granados, Cristina Giuliani, Alessio Boattini and Davide Pettener. Moreover, researchers at the Department of Experimental, Diagnostic and Specialty Medicine also took part in the study: Chiara Pirazzini, Elena Marasco, Gastone Castellani, Claudio Franceschi and Paolo Garagnani. Researchers of these two departments worked together within the framework of the activities of the Interdepartmental Center "Alma Mater Research Institute on Global Challenges and Climate Change".

Donata Luiselli from the Department of Cultural Heritage of the University of Bologna also participated in this study. Finally, Guido Alberto Gnecchi Ruscone (Max Planck Institute for the Science of Human History in Jena, Germany), Massimo Delledonne (University of Verona), Luciano Xumerle (University of Verona), Alberto Ferrarini (University of Verona) and researchers of the Nestlé Research Center in Lausanne (Switzerland), of the Policlinico of Milan, of the University of Florence and of the University of Calabria took part in the study.

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World can likely capture and store enough carbon dioxide to meet climate targets

IMPERIAL COLLEGE LONDON

The capture and storage of carbon dioxide (CO2) underground is one of the key components of the Intergovernmental Panel on Climate Change's (IPCC) reports on how to keep global warming to less than 2°C above pre-industrial levels by 2100.

Carbon capture and storage (CCS) would be used alongside other interventions such as renewable energy, energy efficiency, and electrification of the transportation sector.

The IPCC used models to create around 1,200 technology scenarios whereby climate change targets are met using a mix of these interventions, most of which require the use of CCS.

Now a new analysis from Imperial College London, published today in Energy & Environmental Science, suggests that no more than 2,700 Gigatonnes (Gt) of carbon dioxide (CO2) would be sufficient to meet the IPCC's global warming targets. This is far less than leading estimates by academic and industry groups of what is available, which suggest there is more than 10,000 Gt of CO2 storage space globally.

It also found that that the current rate of growth in the installed capacity of CCS is on track to meet some of the targets identified in IPCC reports, but that research and commercial efforts should focus on maintaining this growth while identifying enough underground space to store this much CO2.

CCS involves trapping CO2 at its emission source, such as fossil-fuel power stations, and storing it underground to keep it from entering the atmosphere. Together with other climate change mitigation strategies, CCS could help the world reach the climate change mitigation goals set out by the IPCC.

However, until now the amount of storage needed has not been specifically quantified.

The study has shown for the first time that the maximum storage space needed is only around 2,700 Gt, but that this amount will grow if CCS deployment is delayed. The researchers worked this out by combining data on the past 20 years of growth in CCS, information on historical rates of growth in energy infrastructure, and models commonly used to monitor the depletion of natural resources.

The research team, led by Dr Christopher Zahasky at Imperial's Department of Earth Science and Engineering, found that worldwide, there has been 8.6 per cent growth in CCS capacity over the past 20 years, putting us on a trajectory to meet many climate change mitigation scenarios that include CCS as part of the mix.

Dr Zahasky, who is now an assistant professor at the University of Wisconsin-Madison but conducted the work at Imperial, said: "Nearly all IPCC pathways to limit warming to 2°C require tens of gigatons of CO2 stored per year by mid-century. However, until now, we didn't know if these targets were achievable given historic data, or how these targets related to subsurface storage space requirements.

"We found that even the most ambitious scenarios are unlikely to need more than 2,700 Gt of CO2 storage resource globally, much less than the 10,000 Gt of storage resource that leading reports suggest is possible.?Our study shows that if climate change targets are not met by 2100, it won't be for a lack of carbon capture and storage space."

Study co-author Dr Samuel Krevor, also from the Department of Earth Science and Engineering, said: "Rather than focus our attention on looking at how much storage space is available, we decided for the first time to evaluate how much subsurface storage resource is actually needed, and how quickly it must be developed, to meet climate change mitigation targets."

The researchers say that the rate at which CO2 is stored is important in its success in climate change mitigation. The faster CO2 is stored, the less total subsurface storage resource is needed to meet storage targets. This is because it becomes harder to find new reservoirs or make further use of existing reservoirs as they become full.

They found that storing faster and sooner than current deployment might be needed to help governments meet the most ambitious climate change mitigation scenarios identified by the IPCC.

The study also demonstrates how using growth models, a common tool in resource assessment, can help industry and governments to monitor short-term CCS deployment progress and long-term resource requirements.

However, the researchers point out that meeting CCS storage requirements will not be sufficient on its own to meet the IPCC climate change mitigation targets.

Dr Krevor said: "Our analysis shows good news for CCS if we keep up with this trajectory - but there are many other factors in mitigating climate change and its catastrophic effects, like using cleaner energy and transport as well as significantly increasing the efficiency of energy use."

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Funding for this work was provided by ACT ELEGANCY, Project No 271498, has received funding from DETEC (CH), BMWi (DE), RVO (NL), Gassnova (NO), BEIS (UK), Gassco, Equinor and Total, and is cofunded by the European Commission under the Horizon 2020 programme, ACT Grant Agreement No 691712. Funding was also provided by the UK CCS Research Centre 2017 EPSRC Grant EP/P026214/1'

SEE MY CCS NEITHER CLEAN NOR GREEN

https://plawiuk.blogspot.com/2014/10/the-myth-of-carbon-capture-and-storage.html

https://plawiuk.blogspot.com/search?q=CCS

Selfie stick and fishing rod shed first light on ancient reptile 

ANOTHER FIND IN THE MUSEUM STORAGE ROOM

UNIVERSITY OF PORTSMOUTH

IMAGE: THIS IS AN ARTISTIC LIFE RECONSTRUCTION OF NANNOPTERYGIUS. view more 

CREDIT: ANDREY-ATUCHIN

The skeleton of an extinct 'fish lizard' locked in a glass case over 16ft from the ground for the last 100 years has finally been studied, thanks to a selfie stick on a fishing rod.

The 145 million year old Nannopterygius is a species of ichthyosaur, which swam the seas of our planet for about 76 million years. It is on display in the Natural History Museum, London, but its glass cabinet is hung too high for easy examination.

Russian palaeontologist Nikolay Zverkov was desperate to see the London specimen as he thought some of the Russian ichthyosaurs might be similar.

It turns out he was right and that this particular species of swimming prehistoric reptile was common in its day, the Jurassic period.

To photograph and assess the skeleton, Nikolay attached a digital camera on a selfie stick to a fishing rod and connected it to a PC via a very long USB cable. He passed the photos on to University of Portsmouth palaeontologist Megan Jacobs who was working on Ichthyosaurs for her Master's Degree.

Megan and Nikolay have now published a paper on the findings in the Zoological Journal of the Linnean Society.

Megan said: "Nicolay obtained excellent detailed photographs which significantly expand our knowledge of Nannoptergyius enthekiodon.

"I realised that fossil expert Dr Steve Etches had also discovered examples of Nannoptergyius near to where the original specimen was found and he'd also discovered other examples across the UK.

"Finally being able to study this enigmatic animal has shown that it was actually very common and widespread in the Late Jurassic occurring not only in England, but also in European Russia and in the Arctic."

Thanks to this new study, several more specimens of Nannopterygius have been found in museum collections across the UK - in Oxford, Cambridge and in the Etches Collection in Kimmeridge, Dorset, as well as in Russia and Norway, showing this animal to be much more common than previously thought, and making it one of the most widespread of any similar swimming reptile.

University of Portsmouth Professor of Palaeobiology, Dave Martill, a world leading expert who supervised Megan's research, said: "We previously only had detailed knowledge of a type of ichthyosaur called Ophthalmosaurus, which was known from hundreds of specimens, including well-preserved skeletons from the Middle Jurassic Oxford Clay Formation of England.

"The excellent data available for Ophthalmosaurus contrasted with the impoverished record of other Middle and Late Jurassic ichthyosaurs, so being able to access the Nannopterygius - a formerly inaccessible specimen - has given us fascinating new insight into a particular species of ichthyosaur we knew very little about."

Nikolay added: "For decades the scientific community thought that Nannopterygius was the rarest and most poorly known ichthyosaur of England. Finally we can say that we know nearly every skeletal detail of these small ichthyosaurs, and that these animals were widespread. The answer was very close - we just needed a fishing rod."

Nikolay Zverkov capturing the ichthyosaur in the Marine Reptile Gallery of the Natural History Museum, London UK.

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First ancient cultivated rice discovered in Central Asia

SCIENCE CHINA PRESS

 

IMAGE: SATELLITE IMAGERY OF KHALCHAYAN AND SURFACE REMAINS WITHIN THE SITE. CREDIT: CHEN GUANHAN AND ZHOU XINYING, IVPP view more 

CREDIT: ©SCIENCE CHINA PRESS

Rice has always been the most important food in Asia and the world. About half of the population on earth use rice as their main food source. The origin, spread, evolution, and ecological adaptation of cultivated rice are still one of the most important issues which currently concerned by global archaeologists, biologists, and agricultural scientists.

In recent years, archaeobotany and molecular biology studies have shown the originally cultivated rice was domesticated into japonica rice (Oryza sativa japonica) in the lower Yangtze region, China, 10000 years ago, then spread to Japan, South and Southeast Asia. About 5000-4000 years ago, the cultivated japonica rice spread to South Asia, hybridized with the native wild rice, gradually form the indica rice (Oryza sativa indica) and become the main crop in South Asia today.

However, in recent years, research on the origin and spread of rice have mainly focused on East Asia, Southeast Asia, and South Asia. At present, we still know very little about when and how rice spread into West Asia, Europe, and Africa. The Central Asia region, as an important node in the ancient Silk Road cannot be ignored, because it is the "crossroad" of world civilization. Therefore, studying the time and location of rice emergence in Central Asia can help us restore the spread process about of rice agriculture and add an important part for the early crop globalization research.

Recently, Li Xiaoqiang research group in Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences (IVPP, CAS) and other researchers in College of Cultural Heritage, Northwest University, China, Institute of Archaeology, Uzbekistan Academy of Sciences reported their latest research about the agricultural remain in Khalchayan site, Uzbekistan, which published in the Science China: Earth Science. Researchers investigated 11 sites on the northern bank of the Amu Darya from Bronze Age to Arabian period and found carbonized rice remain at Kalchayan site. With archaeobotany, chronology method and other local archaeological records, researchers provide a new physical evidence for the spread of rice to western Asia and the exchange of eastern and western civilizations along the ancient Silk Road.

Khalchayan site is a city site in southeastern Uzbekistan. Researchers use flotation method obtain large amount of botanical materials at a cultural layer in southwest part of the site. The AMS 14C dating results showed that the age of the rice remains in the site are 1714-1756 cal. B.P., which in Kushan period. In addition to the rice remains, carbonized wheat, 2-row barley, pea, millet, grapes, flax and other crops were recovered at the site. These crops include both West Asian and East Asian origin, which illustrates a diverse and complex oasis farming system. Because rice cultivation requires a lot of heat and water then wheat and millet, make it difficult to cultivate in arid regions in early times. But combining the carbonized rice remains with the records of the irrigation system existing in other local oases agricultural archeological sites during Kushan period, researchers believe it has the possibility of cultivation rice locally during that time.

Morphological studies show that the carbonized rice remains are japonica rice, and their morphology is similar to the remains found in some sites in southern China and northwestern India during the same period. That indicating the possibility of rice in Central Asia was spread from South Asia. Meanwhile, when rice appeared in Central Asia, Kushan Empire has already established in northwest India and conquered most part of Central Asia and South Asia. The imperial expansion and political unrest may have further fueled the dispersal of crops across Inner Asia. The emergence of rice may also indicate the beginning of the rice-based diet culture gradual integration with the local wheat-based diet system in Central Asia and finally form Central Asia diet system today, like baked dough (Naan), pilaf and barbecue.

The rice remains in Khalchayan site is the first well reported rice remain in Central Asia. It is also one of the few ancient cultivated rice found without in East Asia, South Asia and Southeast Asia. It has a great value for further understanding the exchange process of the early agricultural activities in the Southern Himalayan route, and also provided a new evidence to explain how rice further spreads westward to Iran, Europe, and Africa, where rice cultivation activities exist today.

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This study was supported by the joint archaeological work of China-Uzbekistan (Project leaders: Pro. Wang Jianxin, Northwest University, China); Institute of Vertebrate Paleontology and Paleoanthropology, CAS/CAS Center for Excellence in Life and Paleoenvironment; National Natural Science Foundation of China (Grant No. 41572161, 41730319); Strategic Pilot Science and Technology Projects of Chinese Academy of Sciences (Grant No. XDB26000000) and the Youth Innovation Promotion Association, CAS.

See the article: Chen G, Zhou X, Wang J, Ma J, Khasannov M, Khasanov N, Spengler R N, Berdimurodov A, Li X. 2020. Kushan Period rice in the Amu Darya Basin: Evidence for prehistoric exchange along the southern Himalaya. Science China Earth Sciences, 63, https://doi.org/10.1007/s11430-019-9585-2 http://engine.scichina.com/doi/10.1007/s11430-019-9585-2

Deep learning: A new engine for ecological resource research

SCIENCE CHINA PRESS

 

IMAGE: ECOLOGICAL RESOURCE AREAS THAT ARE IMPACTED AND OVERWHELMED BY DEEP LEARNING (WATER PART) AND THE AREAS NEED TO BE SOLVED (MOUNTAIN PART) view more 

CREDIT: ©SCIENCE CHINA PRESS

Ecological resources are an important material foundation for the survival, development, and self-realization of human beings. In-depth and comprehensive research and understanding of ecological resources are beneficial for the sustainable development of human society. Advances in observation technology have improved the ability to acquire long-term, cross-scale, massive, heterogeneous, and multi-source data. Ecological resource research is entering a new era driven by big data.

Deep learning is a big data driven machine learning method that can automatically extracting complex high-dimensional nonlinear features. Although deep leanring has achieved better performance for big data mining than traditional statistical learning and machine learning algorithms, there are still huge challenges when processing ecological resource data, including multi-source/multi-meta heterogeneity, spatial-temporal coupling, geographic correlation, high dimensional complexity, and low signal-to-noise ratio. A recent study clarified the aforementioned frontier issues.

The related research paper entitled "The Application of Deep Learning in the Field of Ecological Resources Research: Theory, Methods, and Challenges" has been published in "Science in China: Earth Science" . Prof. GUO Qinghua and Ph.D. student JIN Shichao from Institute of Botany, Chinese Academy of Sciences are co-first authors. GUO Qinghua is the corresponding author. Prof. LIU Yu from Peking University and Prof. XU Qiang from Chengdu University of Technology are co-authored research teams.

Deep learning has made significant progress in many fields with the accumulation of data, the improvement of computing power, and the progress of algorithms. This study focuses on the application of deep learning in the field of ecological resources. The main contents include:

1) An overview of the history, development and basic structure of deep learning (Figure 1). The relationships between ecological resource big data research and deep learning structures represented by convolutional neural networks, recurrent neural networks, and graph neural networks were analyzed (Figure 2)
2) The main tasks of deep learning, common public data sets, and tools in ecological resources were summarized (Figure 2).
3) The application of deep learning in plant image classification, crop phenotype, and vegetation mapping were demonstrated. The application ability and potential of deep learning in structured and unstructured ecological data were analyzed.
4) The challenges and prospects of deep learning in the application of ecological resources were analyzed (Figure 3), including standardization and sharing of data, construction of crowdsourcing collection platform, interpretability of deep neural network, hybrid deep learning with domain knowledge, small sample learning, data fusion, and enrichment and intelligence of applications.

This study explored the relationship between deep learning and ecological resource research. It is of great significance for connecting the technological frontier of computer science with the classical theoretical science in the field of ecological resources. This connection will contribute to the establishment of a new paradigm of theoretical discovery and scientific research in the era of ecological resources big data.

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This research was funded by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA19050401) and the National Science Foundation of China (Grant Nos. 31971575 & 41871332)

See the article: Guo, Q., Jin, S., Li, M., Yang, Q., Xu, K., Ju, Y., Zhang, J., Xuan, J., Liu, J., Su, Y., Xu, Q., & Liu, Y. (2020). "Application of deep learning in ecological resource research: Theories, methods, and challenges". Science China Earth Sciences. DOI: 10.1007/s11430-019-9584-9

http://engine.scichina.com/doi/10.1007/s11430-019-9584