CU-Boulder researchers find common factors behind Greenland melt episodes in 2012, 1889

Atmospheric river events 2012. Credit: Don Murray, CIRES/NOAA

New from Colorado.EDU: In 2012, temperatures at the summit of Greenland rose above freezing for the first time since 1889, raising questions about what led to the unusual melt episode. Now, a new analysis led by the Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder shows that some of the same weather and climate factors were at play in both 1889 and 2012: heat waves thousands of miles upwind in North America, higher-than-average ocean surface temperatures south of Greenland and atmospheric rivers of warm, moist air that streamed toward … [Read more...]

Seasonal Arctic summer ice extent still hard to forecast, NSIDC study says

Arctic sea ice

The following is an excerpt from the National Snow & Ice Data Center. Read the entire press release at http://nsidc.org/news/press/2014_seasonalseaice_PR.html. Will next year’s summer Arctic ice extent be high or low? Can ship captains plan on navigating the famed Northwest Passage—a direct shipping route from Europe to Asia across the Arctic Ocean—to save on time and fuel? A new study says year-to-year forecasts of the Arctic’s summer ice extent are not yet reliable. Scientists at the National Snow and Ice Data Center (NSIDC), University College London, University of New Hampshire and … [Read more...]