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Archive for the ‘Arctic Temperature Trend’ Category

The Balding Arctic Sea

Posted by feww on October 6, 2010

Image of the Day

Arctic Sea Ice Minimum for 2010: Third-lowest extent

The 2010 sea ice melt season ended in the Arctic, with the ice extent reaching its low for the year at 4.60 million km² (1.78 million sq. miles) on September 19, the National Snow and Ice Data Center (NSIDC) reported, adding that 2010 Arctic sea ice extent was the third-lowest on the satellite record. (The record low of 4.13 million km² was set in 2007). Both the Northwest Passage and the Northern Sea Route were open for a period during September.


Arctic sea ice extent for September 2010 was 4.90 million square kilometers (1.89 million square miles), the third-lowest in the satellite record. The magenta line shows the median ice extent for September from 1979 to 2000. Sea Ice Index data. Click images to enlarge.
—Credit: National Snow and Ice Data Center


The updated time series plot puts this summer’s sea ice extent in context with other years. The solid light blue line indicates 2010; dark blue shows 2009, purple shows 2008; dashed green shows 2007; light green shows 2005; and solid gray indicates average extent from 1979 to 2000. —Credit: National Snow and Ice Data Center


September ice extent from 1979 to 2009 shows a continued decline. The September rate of sea ice decline since 1979 has now increased to 11.2 percent per decade. —Credit: National Snow and Ice Data Center


A time series of images shows the decline in September sea ice extent over the thirty-year satellite record. Click on the image to open the animated time series in a new window. The animated time series shows ice extent for each of the past thirty-one Septembers, 1979 to 2010. Ice extent this fall was the third-lowest in the satellite record.  —Credit: National Snow and Ice Data Center/NASA E-O


Arctic sea ice extent on September 19, 2010.This image was made from sea ice observations collected by the Advanced Microwave Scanning Radiometer (AMSR-E) Instrument on NASA’s Aqua Source: NASA/EO. Click image to enlarge.


Arctic sea ice total area graph. Source: NASA/EO. Click image to enlarge.

See also: October post on Arctic Sea Ice News & Analysis Web site (http://nsidc.org/arcticseaicenews/)

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Posted in Arctic, Arctic sea ice extent, Arctic Temperature Trend, arctic temps, Arctic thaw | Tagged: , , , , | Leave a Comment »

Greenland Glacier Slides Much Faster in Summer

Posted by feww on May 10, 2010

Greenland glacier slide 220 percent faster in summer: Study

In case anyone doubted the obvious, researchers in Scotland have quantified the differential in the rate of slide of Greenland glacier. The movement of ice sliding down toward the sea is 220 percent faster in summer than in winter, they said.


You think it’s fun to swim in slushy ice water instead of walking on firm ice? Photo Credit: Dan Crosbie (public domain). Click image to enlarge.

The researchers say recent observations of Greenland glacier movement highlighted significant seasonal differences.

Greenland, the world’s second biggest ice sheet after Antarctica, could raise sea levels globally by about 6.7  meters (22 ft) if it melted.

GPS satellite measurements of the glacier movement in south-west Greenland showed that the ice in some places is sliding at 300 meters per year during summer.

“Our measurements reveal substantial increases in ice velocity during summer, up to 220 percent above winter background values,” the study reported.

What if the temperatures were getting warmer all year round?


The map shows temperature changes for the last decade — January 2000 to December 2009 — relative to the 1951-1980 mean. Warmer areas are in red, cooler areas in blue. The largest temperature increases occurred in the Arctic and a portion of Antarctica. (Image credit: NASA). Click image to enlarge.


Arctic Temperatures Trend 1987-2007 Using Satellite Data 1981-2007. Source: NASA

The researchers attribute the summer slide to melt water pooling under the ice.

“In a warming climate, with longer and more intense summer melt seasons, we would expect that water will reach the bed farther inland and a larger portion of the ice sheet will experience summer velocity changes.” The study says.

The study was published in the journal Nature Geoscience on Sunday.


Click image to enlarge.


Greenland Melt Extent, 2005: Konrad Steffen and Russell Huff – Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder

Greenland Ice Sheet

The Greenland ice sheet is a massive glacier (body of ice)  covering more than 1,700,000 square kilometers (664,235 sq miles), which used to cover about 80% of Greenland’s land surface.


Chenega Glacier is an active glacier in Prince William Sound, on the Kenai Peninsula in Alaska. Source: DOI, US Gov.


Chenega Glacier located in the Chugach National Forest, Chugach Mountains, Prince William Sound.Photo Dated 17 June 2004. Source: US Fish and Wildlife Services. Click image to enlarge.

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Posted in Arctic Temperature Trend, Chenega Glacier, Climate Change, greenland, Greenland ice sheet | Tagged: , , | Leave a Comment »