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冰川冻土  2015 

青藏高原近地层及北侧气压系统的季节性振荡变化

DOI: 10.7522/j.issn.1000-0240.2015.0039, PP. 360-368

Keywords: 青藏高原,季节性振荡变化,近地层,气象要素

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Abstract:

基于ERA-Interim逐日4次600hPa位势高度再分析资料,以及青藏高原和周边地区75个气象站日平均温度、降水和相对湿度资料,对高原近地层及北侧气压系统的季节性振荡变化进行了分析.结果表明高原近地层及北侧气压系统强度在围绕中心点顺时针运动时不断加强,逆时针运动时不断减弱.两气压系统呈明显的跷跷板式变化,在600hPa上表现为高度场空间结构沿经向上的调整;低高压差负值的开始和结束时间与高原季风起讫时间吻合.高原夏季降水的起讫不仅与高原及北侧气压系统结构密切相关,而且与高原东南或南部水汽输送条件息息相关.

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