暖化戰爭首部曲-冰雪正回饋效應

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Uploaded by on May 23, 2011

堅硬的冰層覆蓋厚厚的冰雪,可以反射90%左右的太陽光;不過,當冰雪圈的範圍與厚度都開始縮減時,裸露的地表與海水面積也同時增加,如此冰雪反射太陽光的比率便會減少,­而地球吸收太陽光熱能的比率則越來越高,當更少的陽光被反射回太空,將使地球變得更暖,讓更多的冰雪融化。這個過程反覆進行,便會進入一個惡性循環,使地球暖化的速度更快­,這就是冰雪反照率的「正回饋效應」。
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