NASA satellites have seen the minimum summertime
sea ice coverage decline by 13 percent over the last three decades, along with a decline in sea ice thickness.
One possible explanation is that the CMIP5 models underestimate the strength of the feedback as did the CMIP3 models based upon the systematic errors in simulated
sea ice coverage decline relative to observed rates (Boe et al., 2009b).
Not exact matches
Analysis of observed
declines in
sea ice and snow
coverage from 1979 to 2008 suggests that the NH albedo feedback is between 0.3 and 1.1 W m — 2 °C — 1 (Flanner et al., 2011).
They contend polar bears are already being harmed by
declines in summer
sea ice coverage, or will be shortly.
For both summer and winter Arctic
sea -
ice, the area
coverage is
declining at present (with summer
sea -
ice declining more markedly; ref.