北区年降水量变化较小。青藏高原降水量在1978年由少雨期转为多雨期，青藏高原夏季降水与孟加拉湾的水汽输送及副高的水汽输送关系密切。
And we find that the precipitation was catastrophe in 1978. The water vapor of the Bengal Gulf and subtropical high was related to the Plateau summer rainfall.
冯蕾，魏凤英。 2008。 青藏高原夏季降水的区域特征及其与周边地区水汽条件的配置[J]。 高原气象，27（3）：491-499。
Feng Lei, Wei Fengying. 2008. Regional characteristics of summer precipitation on Tibetan Plateau and its water vapor feature in neighboring areas[J]. Plateau Meteor, 27(3):491-499.
青藏高原东北侧地区夏季各月降水量同对流层、平流层前期环流特征之间存在明显的统计相关。
There exists distinct statistical relationship between precipitation of each summer month and prophase atmosphere general circulation introposphere and low stratosphere.
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