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冰川冻土  2012 

2008年夏季北冰洋海冰表面积雪特征初步分析

, PP. 43-48

Keywords: 北极海冰,积雪,水当量

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Abstract:

运用中国第三次北极考察期间观测的积雪资料,分析了夏季北冰洋中心海域海冰表面积雪的空间分布特征.结果表明积雪在垂直分布上呈现6种粒雪状态,表层到底层依次为新降雪、风板、冰片、深霜、冻结状粗雪和渗浸冻结冰层,积雪表面常被新降雪或厚度为2~3cm的风板所覆盖.考察区域积雪的平均密度为(304.01±29.00)kg·m-3,表层密度略低于次表层,遵循雪的密实化原理.积雪厚度,雪水当量和新降雪皆具有由南向北递减的空间分布特征,表明在海冰消融末期,积雪的气候态分布主要是由降水量的多少决定的,积雪的消融和蒸发并非海冰表面积雪评估需考虑的首要因素.雪温随深度的增加而增加,具有明显的垂直梯度,观测区积雪表面的平均温度为(-2.01~±0.96)℃,比海冰/积雪界面的温度高得多.

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