青藏高原隆升对西北地区降水量变化的影响

Influence of the Qinghai-Xizang Plateau Uplifting on Precipitation Change in Northwest China

青藏高原的隆升是地质历史上一次重大的地质事件,中国对西北干旱气候与环境的形成和演变有着重要的影响。本文利用CCM3模式模拟了高原隆升前和隆升至临界高度时,西北地区的降水与现在的差别,从而初步探讨了高原隆升对西北干旱区气候变化的影响。结果表明,高原隆升对西北地区降水有明显影响。隆升前,西北地区年降水比现在偏多约150mm;随着高原隆升西北地区年降水逐步减少,到高原隆升至临界高度时,西北地区降水比高原隆升前约减少了77mm,但仍比现在多约73mm。在不同季节,降水的变化是不尽相同。

The Uplifting of QinghaiXizang Plateau is a very important geological event in the geological history. It very clearly influences the forming and changing of the arid climate and environment in drought area of Northwest China. The CCM3 is used to simulate the differences of the precipitation and temperature over NW China among before, during and after the QinghaiXizang Plateau is uplifted. From the researches, we can simply study the influence of the Plateau uplifting on the climate change in NW China. The results show that the uplifting of QinghaiXizang Plateau can clearly effect on the precipitation of the area. The annual precipitation is more about 150 mm than now before the Plateau is uplifting. And following Plateau is uplifted up, the precipitation is reducing. When the Plateau uplifted up to the critical height, the annual precipitation is reduced about 77 mm, but it is still more than now about 73 mm. The changes of the precipitation are different in different seasons.