A couple of points occur to me: with so much summer daylight and a
marked reduction in ice extent and therefore albedo, the polar ocean
will warm in addition to the effect of warm water arriving from the
Pacific or Atlantic. As we approach little or no summer ice, so we
accelerate towards the point where there's so much ocean heat that the
area of winter refreezing becomes rapidly smaller.
If we postulate a substantially warmer Arctic in the near term, have we
any modelling to suggest the impact on NH climate? I presume the THC
would slow dramatically, but that might not cool Europe much if the
Arctic is warm (compared to today). What are the implications for the
SH, where the Antarctic is "sealed off" from the rest of the world?
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