Remarkable changes with huge planetary implications
Earth’s climate control system — the Arctic — is changing so fast that researchers are having a hard time keeping up. In an effort to understand how the region is shifting toward a new state, a team of scientists spent nearly six months examining the younger and thinner sea ice that’s become ubiquitous in the past few years. They discussed their findings this week at the fall meeting of the American Geophysical Union in San Francisco.
“Many things we experienced took us by surprise,” said Mats Granskog, a research scientist at the Norwegian Polar Institute and chief scientist of the Norwegian young sea ICE, or N-ICE2015 project. “We saw that the new Arctic, with much thinner sea ice only three to four feet thick, functions much differently from the Arctic we knew only 20 years ago, when the ice was much thicker.”
One of the biggest concerns is that the reduced sea-ice coverage and thickness will lead to even more melting, the so-called Arctic amplification. Most of the solar energy that reaches Arctic snow and sea ice gets reflected back into space. But when the snow and ice is replaced by darker, open water, most of the energy gets absorbed and in turn helps melt more ice. Continue reading “Climate scientists track young, thin Arctic ice”→
Arctic sea ice extent set a new record low this near, heightening concerns that the pace of the Arctic meltdown is speeding up. Antarctic sea ice extent also declined to a record low for the month, with sea ice cover worldwide dropping to an exceptionally low level, according the scientists at the National Snow and Ice Data Center.
Specifically, the blanket of ice around the North Pole averaged 3.51 million square miles for the month, the lowest November in the satellite record, and 309,000 square miles below the record set in November 2006. Through 2016, the linear rate of decline for November is 21,400 square miles per year, or 5.0 percent per decade. Continue reading “Global sea ice at record low in November”→
Antarctic sea ice retreat could set stage for ice shelf collapses
Staff ReportMonths of above-average temperatures in the Arctic slowed the growth of sea ice formation to a crawl during the second half of October, the National Snow and Ice Data Center reported in its latest monthly update.The ice scientists said that, starting Oct. 20, Arctic sea ice started setting daily record lows for extent. After mid-October, ice growth returned to near-average rates, but extent remained at record low levels through late October. Both sea surface and air temperatures have remained unusually high, extending from the surface high up into the atmosphere. Continue reading “Climate: Sea ice at both poles way below average”→
Melt season is 2 to 4 weeks ahead of 2012, which set record for low extent
Arctic sea ice extent continues to track toward a record low, the National Snow and Ice Data Center reported last week, resuming regular updates of sea ice after switching to a new satellite for the measurements.
As of June 7, the sea ice meltdown was ahead of 2012 by two to four weeks. Sea ice extent hit a record low that year and has been near that level every year since. The past two years, it set new record-lows for winter extent.
After a winter that saw average temperatures across most of the Arctic hover between 4 to 11 degrees Fahrenheit above average, sea ice in the region peaked at a record low extent for the second year in a row.
“I’ve never seen such a warm, crazy winter in the Arctic,” National Snow and Ice Data Center director Mark Serreze said in a press release that also explained how this year’s maximum sea ice extent came much later than average. See the full NSIDC report here.
Winter brings extraordinary ‘heatwave’ to the far north
Arctic sea ice was at a record low extent for the second month in a row in February, according to the National Snow and Ice Data Center. Ice researchers said sea ice grew hardly at all during the first three weeks of the month during a time of year when the sea is extent is usually nearing its peak.