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SW: →Arctic ice: Add section
====Arctic ice====
The ISPM states: "Arctic sea ice thickness showed an abrupt loss prior to the 1990s, and the loss stopped shortly thereafter." [ISPM ES] Sea ice thickness, along with various uncertainties associated with its measurement and attribution, are discussed at great length in the ISPM (as well as in AR4). [ISPM 2.5d, 2.5f, 2.5g; AR4 4.4.3]
However, the AR4 gives even more prominence to arctic ice '''extent''', and summarizes: "Satellite data indicate a continuation of the 2.7 ± 0.6% per decade decline in annual mean arctic sea ice extent since 1978. The decline for summer extent is larger than for winter, with the summer minimum declining at a rate of 7.4 ± 2.4% per decade since 1979. Other data indicate that the summer decline began around 1970." [AR4 4 ES; see also 4.4.2] The ISPM does not mention arctic sea ice extent at all.
==External links==
