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Uploaded on Wednesday 22 Feb 2012 by GRID-Arendal

Thinning of the Arctic sea-ice

Year: 2005
From collection: Vital Climate Graphics
Author: Philippe Rekacewicz, UNEP/GRID-Arendal
Description:
Sea-ice draft is the thickness of the part of the ice that is submerged under the sea. Comparison of sea-ice draft data acquired on submarine cruises between 1993 and 1997 with similar data acquired between 1958 and 1976 indicates that the mean ice draft at the end of the melt season has decreased by about 1.3 m in most of the deep water portion of the Arctic Ocean, from 3.1 m in 1958-1976 to 1.8 m in the 1990s. In summary: ice draft in the 1990s is over a meter thinner than two to four decades earlier. The main draft has decreased from over 3 meters to under 2 meters, and the volume is down by some 40%.
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Sources of greenhouse gases
Global atmospheric concentration of CO2
Main greenhouse gases
Scenarios of sea level rise, now - 2100
Potential climate change impacts
Temperature and CO2 concentration in the atmosphere over the past 400 000 years
IPCC structure
Radiative forcing - energy balances and the greenhouse effect