24 October 2016, NASA, Studies offer new glimpse of melting under Antarctic glaciers. Two new studies by researchers at NASA and the University of California, Irvine (UCI), detect the fastest ongoing rates of glacier retreat ever observed in West Antarctica and offer an unprecedented direct view of intense ice melting from the floating undersides of glaciers. The results highlight how the interaction between ocean conditions and the bedrock beneath a glacier can influence the glacier’s evolution, with implications for understanding future ice loss from Antarctica and global sea level rise. The two studies examined three neighboring glaciers in West Antarctica that are melting and retreating at different rates. Smith, Pope and Kohler glaciers flow into the Dotson and Crosson ice shelves in the Amundsen Sea Embayment in West Antarctica, the part of the continent with the largest loss of ice mass. A study led by Bernd Scheuchl of UCI, published in the journal Geophysical Research Letters on Aug. 28, used radar measurements from the European Space Agency’s Sentinel-1 satellite and data from the earlier ERS-1 and ERS-2 satellites to look at changes in the glaciers’ grounding lines — the boundary where a glacier loses contact with bedrock and begins to float on the ocean. The grounding line is important because nearly all glacier melting takes place on the underside of the glacier’s floating portion, called the ice shelf. If a glacier loses mass from enhanced melting, it may start floating farther inland from its former grounding line, just as a boat stuck on a sandbar may be able to float again if a heavy cargo is removed. This is called grounding line retreat. Read More here
Yearly Archives: 2016
17 October 2016, Renew Economy, Historic climate deal reached on potent refrigerant gases. After almost a decade of efforts to achieve a climate benefit of up to 0.5°C reduction in global temperature by the end of the century, 197 nations have finally reached agreement on the Kigali Amendment to the Montreal Protocol. At the conclusion of unprecedented overnight negotiations extending past 7am last Saturday in the Rwandan capital, a face-saving compromise was finally achieved. Negotiations at the Montreal Protocol on an amendment to include the hydrofluorocarbons or HFCs, potent synthetic greenhouse gases used primarily as refrigerants, began in earnest in 2009. But the first concerted efforts to draw international attention to the problem of projected rapid growth in HFC emissions began at the UNFCCC COP13 in Bali in 2007, where the London and Washington based Environmental Investigation Agency worked for two weeks with several large boxes of briefing notes to teach observers and negotiators alike to speak about the “F for Forgotten” F-gases.Highly regarded scientific papers by the Dutch climate scientist Guus Velders (et. al.) in the Proceedings of the National Academy of Sciences (PNAS) in 2007 and 2009 were crucial in gaining the attention of the highest levels of the Obama administration, and so the long road to the historic agreement in Kigali last week began. As Obama’s Presidential statement on the agreement concludes, “diplomacy is never easy”. In spite of its flaws and shortcomings, the compromise brokered to deliver the climate legacy sought by the US is a significant achievement. Jubilation that might have been expected by the achievement of the “largest temperature reduction ever achieved by a single agreement” (according to one seasoned observer) has been tempered by delays in implementation of restrictions on use of HFCs granted to a block of recalcitrant developing countries including India, Pakistan, Iran, Iraq and Arab Gulf states. Read more here
22 October 2016, The Economist, Let the haggling begin – With the announcement of a national carbon price, Justin Trudeau opens a new phase of his government. “THIS is betrayal,” thundered Saskatchewan’s long-serving premier, Brad Wall. His grievance: the decision this month by Canada’s prime minister, Justin Trudeau, to set a minimum price for carbon emissions that all provinces would have to adhere to. Since taking office nearly a year ago, Mr Trudeau and his ministers have spent much of their time consulting the provinces (and ordinary Canadians) on such issues as judicial reform and defence. His carbon-price announcement marks a transition from talking to acting, and a new contentious phase in relations between the federal government and the ten provinces. Canada’s grand political bazaar, in which the prime minister and the premiers strike the bargains that determine how the country will be governed, is again open for business. Despite Mr Wall’s profession of shock, the carbon-price policy is no surprise. Mr Trudeau has made it plain that, unlike his Conservative predecessor, Stephen Harper, he takes the threat of climate change seriously. One of his first acts in office was to agree last December to sign the Paris climate accord, under which Canada is to reduce its emissions of greenhouse gases by 30% below the levels of 2005 (see chart). The deadline is 2030. Although Canada emits just 2% of the world’s greenhouse gases, it is one of the world’s biggest emitters per person. Without carbon pricing, it will not keep its climate promises. Read More here
22 October 2016, Climate News Network, Bolivian glaciers melt at alarming rate. A new study mapping the effects of dwindling glaciers on people living in Bolivia reveals rapid shrinkage and potentially dangerous glacial lakes. Between 1986 and 2014 – one human generation –the glaciers of Bolivia shrank by 43%, according to new research. This presents a problem in the long term for more than 2 million people who rely on glacial meltwater supply in the dry season, and immediate danger in the short term for thousands who might live below precarious glacial lakes. Glaciers are in retreat as the world warms − a consequence of rising levels of carbon dioxide in the atmosphere in response to the increasing combustion of fossil fuels. They are dwindling almost everywhere in the Andean chain, in Greenland, in Alaska and Canada, the Himalayas, across the entire mass of Central Asia,and everywhere in the tropics. Tropical glaciers But a new study in The Cryosphere, the journal of the European Geosciences Union, is one of the first to examine in detail precisely what this retreat could mean for the human communities in Bolivia, home to one-fifth of the world’s tropical glaciers. Researchers from two British universities and a Bolivian colleague examined NASA satellite images of the region and found that the area of the Bolivia Cordillera Oriental normally covered by glaciers fell from 530 square kilometres in 1986 to about 300 sq km in 2014 − a shrinkage of more than two-fifths. Read more here