北半球海冰和陆雪对东亚季风的影响及作用的可能途径

本文应用统计方法分析陆雪和海冰与东亚夏季风的关系。分析结果表明:前期海冰和陆雪,对夏季风强度有影响,而与夏季风同时的海冰和陆雪的异常,却与夏季风相关甚小,这是由于大气状况的变化与下垫面的能量储放有关。本文初步探讨北极海冰对东亚夏季风影响的可能途径,认为海冰通过大西洋海温、大西洋副热带高压及青藏高压,由夏季对流层上层的东西热力环流圈和季风环流圈,对东亚夏季风起一定影响。

A PROBABLE AVENUE OF THE EFFECT OF THE ARCTIC SEA ICE AND THE LAND SNOW IN THE NORTHERN HEMISPHERE ON SUMMER MONSOON IN EAST ASIA

Using the statistical methods, the relationships among the Arctic sea ice, the land snow and the index of the summer monsoon intensity in East Asia are analyzed in this paper. The analyses show that the effects of land snow area and the Arctic sea ice during previous period on summer monsoon in East Asia are more obvious than the effects during summer, because the atmospheric circulation has close relationship with the energy storage of the underlying surface. A probable way of the effect of the Arctic sea ice on summer monsoon in East Asia is discussed, first, the Arctic sea ice effects the sea surface temperature and intensity of subtropical high in Northern Atlantic by the Canary current, then the summer monsoon in East Asia is affected by the East-west thermodynamic circulation and the monsoon circulation at upper troposphere.