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近40年青藏高原季风变化的主要特征
引用本文:白虎志,谢金南,李栋梁.近40年青藏高原季风变化的主要特征[J].高原气象,2001,20(1):22-27.
作者姓名:白虎志  谢金南  李栋梁
作者单位:1. 兰州中心气象台, 甘肃 兰州 730020
2. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000
基金项目:中国气象局“西北气候变化趋势和旱作农业适用技术研究”项目资助
摘    要:通过计算1961-1995的逐日青藏高原季风指数,初步确定了高原夏季风开始和结束的时间,在此基础上研究了季风指数的年际变化特征以及和500hPa高度场、东亚季风之间的可能联系。结果表明:夏季风开始和结束的时间呈反相关关系;高原季风的年际和年代变化明显;高原冬季风强(弱)与同期高原及乌拉尔山500hPa高度场偏高(低)以及东亚冬季风偏强(弱)相联系;高原夏季风偏强(弱)与同期贝湖至高原南部500hPa高度场偏低(高)、西亚和中国东部高度场偏高(低)以及东亚夏季风偏强(弱)相联系。

关 键 词:青藏高原  季风指数  大气环流  年际变化
文章编号:1000-0534(2001)01-0022-06
修稿时间:1999年6月24日

The Principal Feature of Qinghai-Xizang Plateau Monsoon Variation in 40 Years
BAI Hu-zhi.The Principal Feature of Qinghai-Xizang Plateau Monsoon Variation in 40 Years[J].Plateau Meteorology,2001,20(1):22-27.
Authors:BAI Hu-zhi
Abstract:The daily monsoon index of Qinghai-Xizang Plateau during1961—1995 is calculated, the start and end time of summer monsoon of Qinghai-Xizang Plateau are preliminarily determined. Based upon that, we investigate the interannual variation features of the monsoon index and its relationship with the 500 hPa geopotential height fields and monsoon of East Asia. The results are as follows: The anticorrelation exists in the start and the end time of summer monsoon; The interannual and interdecadal variation of Plateau monsoon is obvious; The strong(weak) winter Plateau monsoon is contemporarily related to the high (low) 500 hPa geopotential height fields over Qinghai-Xizang Plateau and the Ural mountains and to the strong(weak) winter monsoon of East Asia; The strong(weak) summer Plateau monsoon is contemporarily related to the low(high) 500 hPa geopotential height fields over the Baykal lake and south of Qinghai-Xizang Plateau and to the high(low) 500 hPa potential height fields over West Asia and East China and also to the strong(weak) summer monsoon of East Asia.
Keywords:
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