| 青藏高原热力异常与华北汛期降水关系的研究 |
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| 引用本文： | 赵声蓉,宋正山,纪立人.青藏高原热力异常与华北汛期降水关系的研究[J].大气科学,2003,27(5):881-893. |
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| 作者姓名： | 赵声蓉 宋正山 纪立人 |
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| 作者单位： | 中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 中国科学院知识创新项目ZKCX2-SW-210项目第三课题、国家重点基础研究发展规划项目G1998040900和国家攀登项目B"TIPEX"共同资助 |
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| 摘 要： | 利用1980～1994年NCEP/NCAR再分析资料,以及我国336个测站1956～1994年月降水量资料,通过诊断分析和数值实验,研究了夏季高原上热力异常与华北汛期降水的关系.结果表明:华北汛期干旱年,青藏高压及西太平洋副热带高压偏南、偏东,华北汛期降水偏多年则相反;华北汛期旱年时,高原上升、高原东侧邻近地区下沉的垂直环流明显加强,而降水偏多年时,垂直环流减弱,华北地区为上升气流控制;夏季高原为热源和水汽汇区,它们的异常对华北地区降水有很大影响,当热源和水汽汇增强(减弱)时,华北地区降水偏少(偏多).数值试验表明,高原上潜热加热异常引起青藏高压、西太平洋副热带高压、亚洲季风以及欧亚中高纬地区环流的变化,进而影响到华北地区的降水.
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| 关 键 词： | 降水异常 垂直环流 热源 青藏高压 |
Heating Effect of the Tibetan Plateau on Rainfall Anomalies over North China during Rainy Season |
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| Zhao Shengrong,Song Zhengshan and Ji Liren.Heating Effect of the Tibetan Plateau on Rainfall Anomalies over North China during Rainy Season[J].Chinese Journal of Atmospheric Sciences,2003,27(5):881-893. |
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| Authors: | Zhao Shengrong Song Zhengshan and Ji Liren |
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| Abstract: | The relationship between rainy season rainfall over North China and the heating effect of the Tibetan Plateau is diagnostically investigated Results are identified through numerical experiments further The NCEP/NCAR reanalysis data from 1980 to 1994 and the rainfall data of 336 stations in China from 1956 to 1994 are used It has been found that the Tibetan High and the West Pacific Subtropical High tend to south and east (north and west) in drought (flood) year of North China There exists a vertical circulation with ascending motion over the Tibetan Plateau and sinking motion over eastern area closed to the Tibetan Plateau This vertical circulation is stronger in drought year of North China, but weaker in flood year of North China and ascending motion is over North China During rainy season of North China, the Tibetan Plateau is mainly dominated by positive vertical integrated heat source and moisture sink The negative correlation between heat source and moisture sink over the Tibetan Plateau and rainfall of North China is obvious Numerical experiments show that latent heat anomalies over the Tibetan Plateau will cause change of circulation in middle and high latitudes, the Tibetan High and the West Pacific Subtropical High, then influence rainfall of North China further |
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| Keywords: | rainfall anomalies vertical circulation heat source Tibetan High |
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