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大气科学  2006 

青藏高原对流时空变化与东亚环流的关系

DOI: 10.3878/j.issn.1006-9895.2006.05.09

Keywords: 青藏高原对流,东亚环流,洪涝,干旱

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Abstract:

根据1980~1998年逐日TBB和NCEP/NCAR再分析资料,探讨青藏高原对流(TBB)时空分布与东亚环流及天气气候的关系.研究指出,青藏高原主体地区(28°N~34°N,80°E~102°E)的对流冬弱、夏强,存在显著的6月和10月突变现象.夏季亚洲地区最强的对流出现在青藏高原上空,呈现为高原西部(28°N~34°N,82°E~94°E)和东部(27°N~34°N,104°E~110°E)型.夏季青藏高原上空对流弱,850hPa风场上高原南、北侧的东亚地区分别呈现西风距平,夏季中国易出现南北二条雨带;夏季高原上空对流强,850hPa风场上的西风距平出现在东亚30°N附近,夏季易出现江淮流域雨带.夏季江淮流域洪涝年(如1980、1993、1996、1998年)与青藏高原东、西部对流同时加强有关;夏季江淮流域干旱年(如1992、1994、1997年)与青藏高原东、西部对流同时减弱有关.20世纪90年代,江淮流域洪涝与干旱事件频繁发生可能与青藏高原东、西部对流强度变化出现同位相的年代际变化趋势有关.

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