2015 Arctic maximum sea ice on 20150225也是歷來最小冰域


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上傳日期:2015-03-30

The maximum Arctic sea ice extent appears to have occurred on February 25, 2015, reaching an extent of 14.52 million square kilometers (5.61 million square miles). If the February 25 value holds, it would be one of the earliest maximums on record, 15 days earlier than normal, and the lowest extent in the satellite record starting in 1979. It is 129,500 square kilometers (50,000 square miles) below the previous lowest maximum recorded in 2011. Overall, there is a declining trend in the maximum extent of about 2.5 % per decade. This is much smaller than the summer trends, but also reflects the long-term warming trend in the Arctic.

While a low maximum gives the extent a head start heading into summer, it turns out that there is very little relation between the maximum and summer minimum and a record low maximum does not portend a record low minimum. This is because the ice near the edge at the time of the maximum is thin, seasonal ice that will melt out early in the summer. The weather conditions in the Arctic during the summer melt season is the most crucial in determining whether a record low is possible in any given year.

Visualization Credits
Cindy Starr (GST), Data Visualizer
Jefferson Beck (USRA), Producer
Joy Ng (USRA), Producer
Josefino Comiso (NASA/GSFC), Scientist
Walt Meier (NASA/GSFC), Scientist
Rob Gersten (Wyle Information Systems), Data Provider

Please give credit for this item to:
NASA's Scientific Visualization Studio

AMSR2 data courtesy of the Japan Aerospace Exploration Agency (JAXA).

The Blue Marble data is courtesy of Reto Stockli (NASA/GSFC).
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