文中主要研究了北极海冰与中国华北地区降水的关系。
The present paper is mainly about the relationship between Arctic sea ice and the precipitation of North China.
用该方法计算华北地区降水性层状云两次降水过程的平均降水效率分别为68%和59%。
The precipitation efficiencies of two stratiform clouds processes over North China are 68% and 59% respectively.
东亚季风环流对华北降水和气温的共同作用，导致华北地区降水蒸发差发生年际和年代际变化。
The conjunctive actions of the atmosphere circulation over East Asia area on the precipitation and air temperature induced the interannual and interdecadal variations of the DPE in the North China.
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