Nature Climate Change, August 10 The Arctic Ocean could be seasonally ice-free at temperatures only slightly above today’s, once land-based Arctic summer temperatures average 4 to 5°C above pre-industrial. This would occur by summer 2035 under high emissions scenarios; parts of the Arctic were already far warmer this summer. These new simulations using CMIP6, by […]
Nature Geoscience, August 3 An updated approach is required to estimate the melting of global glaciers due to rock debris partially insulating the glaciers’ surface. As glaciers shrink, eroded rock from surrounding mountain slopes becomes exposed and slides down, forming a layer on the surface of glaciers which, if thick enough, reduces the rate at […]
Nature Climate Change, August 3 In New Zealand’s Southern Alps, anthropogenic forcing has made extreme loss of glacier ice at least 6 times more likely to occur in 2011 and 10 times in 2018 (>90% confidence). These were two of the highest mass-loss years ever recorded in that region. This increased likelihood is driven by […]
Water and Ice Research Laboratory, August 7 This extremely warm summer is driving some dramatic collapses: one of the last remaining Canadian Ice Shelves, the Milne Ice Shelf lost 43% of its area (80 km2, greater than the size of Manhattan) in a dramatic collapse on July 31st, compromising nearby ecosystems as well as threatening […]
Proceedings of the National Academy of Sciences, August 3 Despite recent progress on bending the emissions curve and the global pandemic, cumulative CO2 emissions measured between 2005 and 2020 place us on track (within 1%) of RCP8.5, the most aggressive scenario in assumed fossil fuel use. Between 2030 and 2050, human CO2 emissions will likely […]
加拿大地理学家，7月16日 户外滑冰是许多北部地区重要的文化娱乐活动，并在北美身份认同中占有重要地位。研究人员利用在美国和加拿大六个城市收集的公民科学数据，估算了过去冬季不存在历史观测数据的后院滑冰条件。他们发现 […]
科学，7月10日 北冰洋浮游植物生物量在1998年至2018年间增加了57%%。食物链底端生物量的激增部分是由于北极海冰的退缩以及邻近海洋新营养物质的涌入。未来，欧洲和……
Scientific Reports, July 30 Under the high emissions RCP8.5 scenario, and with no adaptation such as sea walls or inland migration, increases of 48% in total land area, 20% of global GDP and an additional 23 million people could face periodic risk of flooding by 2100, significantly increasing previous estimates. Regions in northwestern Europe, Asia, […]
Nature, July 29 Over the past 40 years, the rate of change in large portions of the Arctic appears comparable to past rapid warming events, going back to the last interglacial period as reflected in this analysis of Greenland ice cores. These past warming events were typically characterized by warming rates of 1-2°C per decade […]
While the Siberian heatwave drove large wildfires in July, other parts of the Arctic also saw record-breaking temperatures. On July 25, the town of Longyearbyen in Svalbard, an archipelago in the Norwegian High Arctic saw temperatures reach 21.7°C, breaking the previous record by 0.4°C; with daily temperatures exceeding 20°C for four days in a row. […]
Proceedings of the Royal Society B, July 22. A team of scientists has discovered the first active leak of methane through the Antarctic seafloor, in the Ross Sea. Researchers monitored microbial communities that can consume the greenhouse gas before it reaches the atmosphere, and therefore play an important role within the methane cycle. Their work reveals […]
Nature Climate Change, June 29. Surface air temperatures at the South Pole over the past 30 years, as measured at the Scott-Amundsen station and across the Antarctic plateau, reached record-high warming levels of 0.61 ± 0.34 °C per decade, more than three times the global average. Scientists found that stronger low-pressure systems in the Weddell Sea carry warmer […]
Nature, July 22 Large sections of the massive Wilkes Basin ice sheet of East Antarctica, holding 3-4 meters of SLR collapsed only 400,000 years ago, retreating over 700 km inland from the current ice margin – dispelling theories that it had been stable for millions of years. This glacial retreat, measured through traces of uranium-234 in […]
AGU, July 21, 2020 Earth’s global “climate sensitivity” to CO2 emissions remains a fundamental question in predicting the future climate. Until now, scientists relied on a 1979 estimate of 1.5‐4.5°C per doubling of atmospheric carbon dioxide (assuming no other climate forcing). For the first time in 40 years, this consensus report – part of preparation […]
Global Methane Budget, 2000-2017 (2020), July 15, 2020. A new consensus update to global methane emissions reveals that atmospheric methane increased by 8.5ppb and 10.7ppb in 2018 and 2019, respectively – two of the highest annual values of the 21st century. The current concentration of atmospheric methane is more than 2.5 times higher than pre-industrial […]