摘要
利用1980—2004年NCEP/DOE新再分析月平均资料及我国225个测站1980—2004年月降水量资料,通过诊断分析,研究了南疆夏季降水异常的环流和高原地表潜热通量特征。结果表明:南疆夏季降水偏少年,南亚高压西部偏强,西风急流位置偏北,500 hPa中高纬环流经向度减弱,伊朗高压偏北、偏东,西太平洋副热带高压偏西、偏南;降水偏多年则相反。南疆夏季降水偏少年,高原北部和南疆地区为下沉的垂直环流距平,Ferrell环流增强;降水偏多年则相反。南疆夏季降水偏少年和偏多年的前期冬春季开始孟加拉湾、青藏高原和南疆地区地表潜热通量具有相反的变化,南疆夏季降水与高原北部地表潜热通量呈显著正相关,与南部地表潜热通量呈反相关关系。
The surface latent heat flux characteristics over Tibetan Plateau and circulations of summer rainfall anomalies in South Xinjiang are diagnostically investigated using the NCEP/DOE reanalysis data and the precipitation data of 225 stations in China from 1980 to 2004.It has been found that west(east) south Asia high is stronger than normal,westerly jet tends to north(south),Iran high moves to north and east(south and west),and western Pacific subtropical high moves to south(north) in drought(flood) year of South Xinjiang.There exits a vertical circulation with descending(ascending) motion anomaly over North Tibetan Plateau and South Xinjiang,and Ferrell circulation strengthens(weakens) in drought(flood) year of Xinjiang.From winter-spring to summer the latent heat variations over Bengal Bay,Tibetan Plateau and South Xinjiang are reverse between drought and flood years of South Xinjiang.There is obvious positive correlation between summer rainfall in South Xinjiang and latent heat over North Plateau.
出处
《高原气象》
CSCD
北大核心
2007年第3期435-441,共7页
Plateau Meteorology
基金
科技部社会公益类研究项目(2004DIB3J118)
中国气象局气象新技术推广项目(CMATG2007M26)
中国气象局高原气象研究基金项目(LPM2005009)
新疆自治区自然科学基金项目(200421102)共同资助
关键词
南疆
青藏高原
降水异常
环流
地表潜热通量
South Xinjiang
Tibetan Plateau
Precipitation anomalies
Circulation
Surface latent heat flux