Sunlight, clouds, sea ice, albedo, and the radiative budget: the umbrella versus the blanket

Sunlight, clouds, sea ice, albedo, and the radiative budget: the umbrella versus the blanket
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阳光、云、海冰、反照率和辐射预算：雨伞与毯子

DOI：
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发表时间：
2018
期刊：
The Cryosphere
影响因子：
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通讯作者：
D. Perovich
D. Perovich
中科院分区：
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文献类型：
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作者：
D. Perovich

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Abstract. The surface radiation budget of the Arctic Ocean plays a central role in summer ice melt and is governed by clouds and surface albedo. I calculated the net radiation flux for a range of albedos under sunny and cloudy skies and determined the break-even value, where the net radiation is the same for cloudy and sunny skies. Break-even albedos range from 0.30 in September to 0.58 in July. For snow-covered or bare ice, sunny skies always result in less radiative heat input. In contrast, leads always have, and ponds usually have, more radiative input under sunny skies than cloudy skies. Snow-covered ice has a net radiation flux that is negative or near zero under sunny skies, resulting in radiative cooling. Areally averaged albedos for sea ice in July result in a smaller net radiation flux under cloudy skies. For May, June, August, and September, the net radiation is smaller under sunny skies.