Antarctic glacier retreated 3 miles in 22 years, threatening global sea-level rise
Doyle Rice, USA TODAY 3/23/2020
How adult Americans think about climate change.
It's getting warmer down at the bottom of the world.
As the global climate heats up, some of the great ice sheets and glaciers in Antarctica are melting, a few of them rapidly. One, East Antarctica’s Denman glacier, has retreated nearly 3 miles in just the past 22 years, according to a new study.
Researchers are concerned that the shape of the ground surface under the ice sheet could make it even more susceptible to a climate-driven collapse. "If fully thawed, the ice in Denman would cause sea levels worldwide to rise almost 5 feet," the University of California-Irvine said in a statement.
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“East Antarctica has long been thought to be less threatened (than West Antarctica), but as glaciers such as Denman have come under closer scrutiny by the cryosphere science community, we are now beginning to see evidence of potential marine ice sheet instability in this region,” said study co-author Eric Rignot, a scientist at the University of California-Irvine.
The cryosphere includes all of the world's frozen places.
Ice melt accelerating:Greenland and Antarctica are now melting six times faster than in the 1990s, accelerating sea-level rise
“The ice in West Antarctica has been melting faster in recent years, but the sheer size of Denman glacier means that its potential impact on long-term sea-level rise is just as significant,” he added.
Sea-level rise is one of the main effects of human-caused climate change. It's important here in the United States because almost 40% of the U.S. population lives in relatively high population-density coastal areas, where sea level plays a role in flooding, shoreline erosion and hazards from storms, according to the National Oceanic and Atmospheric Administration.
And globally, eight of the world’s 10 largest cities are near a coast, the United Nations' Atlas of the Oceans reports.
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Overall, NOAA said global sea levels have risen about 8 to 9 inches since 1880, and about a third of that is coming in just the last 2½ decades. Most of that rise is because of meltwater from glaciers and ice sheets and the expansion of seawater as it warms.
The Denman glacier experienced a loss of 268 billion tons of ice from 1979 to 2017, according to the study. Researchers used radar data from aboard a satellite to measure the ice loss.
“Because of the shape of the ground beneath Denman’s western side, there is potential for rapid and irreversible retreat, and that means substantial increases in global sea levels in the future,” said study lead author Virginia Brancato of NASA's Jet Propulsion Laboratory.
Richard Alley, a Penn State University glaciologist who was not involved in the study, told The Washington Post that “this study provides additional evidence that, based on current knowledge, we cannot exclude at least a slight possibility of much more sea-level rise than the most-likely value in (Intergovernmental Panel on Climate Change) projections."
The study was published Monday in the peer-reviewed journal Geophysical Research Letters, a publication of the American Geophysical Union.
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This article originally appeared on USA TODAY: Antarctic glacier retreated 3 miles in 22 years, threatening global sea-level rise
(Bloomberg) -- The Bank of Canada has expanded its authority to buy and sell securities outright, according to a public notice by the central bank.
The central bank added the right to buy and sell the debt of companies and municipalities, along with other instruments when it is “addressing a situation of financial system stress that could have material macroeconomic consequences,” according to the March 13 notice in the Canada Gazette issued by Governor Stephen Poloz. Those amendments add to the central bank’s power to conduct buybacks on various products, including corporate debt.
“The ability to purchase securities outright is a crucial step in arresting the impairment in system-wide liquidity in Canada” Ian Pollick, Global Head of FICC Strategy at the Canadian Imperial Bank of Commerce, said by email. “Price-discovery has collapsed on the back of these stresses, so it is crucial for the Bank to respond in-kind with a program that targets both public and private sector assets.”
Spokeswoman Louise Egan confirmed the amendments were made primarily to enable the central bank to conduct operations under its new Bankers’ Acceptance Purchasing Facility. The changes are significant because the central bank can now make outright purchases of securities that were previously only allowed to be acquired via term repo buybacks.
The central bank has taken a series of measures to inject liquidity into the country’s financial system, to prevent funding markets from seizing up. Analysts say it may be forced to introduce a more formal quantitative easing program as the country contends with a dramatic rise in unemployment.
Bank economists now expect the Canadian economy to shrink between 10% and 24% on an annualized basis, a recession deeper than the worst of the 2008-09 financial crisis. Many see it as inevitable that Poloz and his governing council will cut the overnight rate to near zero, then start rummaging deeper into their toolbox.
“We think the bank will be forced to adopt QE and that they’ll look to ultimately buy up to C$150 billion in securities,” said TD Securities macro strategist Robert Both in an email. “We think it is a question of when and not if.”
Sharp Economic Slide
Quantitative easing, which sees central banks buy government bonds as part of an effort to keep borrowing costs low for a prolonged period of time, would be a first for the Bank of Canada, which didn’t follow its peers to such lengths during the 2008 crisis.
The global outlook is deteriorating rapidly, forcing central banks into new territory. The Federal Reserve said Monday it will buy unlimited amounts of Treasury bonds and mortgage-backed securities to suppress borrowing costs and ease the flow of credit amid a historic economic shock.
The Bank of Canada’s governing council often distances itself from monetary policy decisions south of the border. But the Fed’s move opens the door to a more robust response from Canadian policy makers.
“The Bank of Canada doesn’t like being pushed by the Fed, but now it’s global,” said Benjamin Reitzes, an economist at Bank of Montreal, which sees an 80% chance the central bank will need to start quantitative easing.
“The question is why they’d wait until April -- given the broad shutdowns it’s already clear that conditions have deteriorated sharply,” he said.
While Poloz said last week that other options are on the table, he made it clear the measures the bank has taken so far -- including upping the purchases of mortgage-backed securities -- don’t constitute quantitative easing.
“The programs the bank has introduced are very important in unlocking funding markets,” Pollick said. “The problem is, liquidity is so distressed that they are not working as planned. They need to bring out the Canadian bazooka,” adding that he’s certain the central bank will “imminently” launch QE.
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