This necessarily means thinner ice has an impact in profound ways, the buildup of winter, how big it becomes, how long it lasts, depends on how cold the Arctic and Sub-Arctic surface areas become. A prolonged cold period permeating a huge area of the Earth defines the winter bitter, too long, miserable. From the onset of a greater sea ice melt at minima, the world wide dark season becomes automatically warmer, shorter, less expansive, even with ideal conditions of thermal radiation cooling to space, the thinner than multi-year new ice warms the atmosphere, not only by thermal radiation from the sea, but because of its fragile state, creating more leads, venting moisture and gases to the atmosphere throughout the winter, as opposed to a period called spring "break up", when vast amounts of organic and inorganic gases, naturally trapped under the ocean for many months, gets unleashed with great amounts of water vapour, at about Mid-April onwards, when lower clouds and ice crystals overtook the sky. This eruption from the sea protected sea ice further by reflecting resurgent sun rays to space. For about a decade, this happened a lot less, while during these last 10 years or so the process of all winter venting did the opposite, it clouds the Arctic further during the dark season, deflecting radiation usually heading to space back to the sea ice. The OLR chart is worse than it seems, a lot more of thermal radiation returns to surface. Thus from darkness a warmer Arctic is seen on historic charts.
Translation in temperature terms
|The larger dark blue average temperature covering the Arctic Ocean was about 242.5 K, or -31 C.
That is the average temperature of sea ice surface for December 1981.
March 31 2004, very cold ground triggered isothermal boundary layers are seen breaking up the sun disk even to bend along with them diagonally. The sunset on
top of the hill captured a magnificent green flash, along with bent layering features.
Warming off the ground changes the sunset, the sun looks rounder, the layering vanishes. Land and seas capable once of fostering great anticyclones transform to cyclone bearing zones. April 28, 2013.
Isothermal layering on a grand scale fosters High pressure systems. During Polar winters these systems cool the Earth a great deal. If the Cyclogenesis system balance continues to change, like during current reduction of disappearance of sea ice as of current days, winter has no other way but to shrink in size, and be more wild and variable temperature wise because what is left of the cold air zone moves around with the rotation of the Earth. WD January 11, 2013