青藏高原东部和西太平洋暖池区大气热源与中国夏季降水的关系
ON THE RELATIONSHIPS BETWEEN THE SUMMER RAINFALL IN CHINA AND THE ATMOSPHERIC HEAT SOURCES OVER THE EASTERN TIBE岮N PLATEAU AND THE WESTERN PACIFIC WARM POOL
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摘要: 利用1951~2000年NCEP/NCAR逐日再分析资料计算了大气热源,并对夏季青藏高原东部大气热源异常和西太平洋暖池区大气热源异常对中国夏季降水的影响作了对比分析研究。结果表明,如果高原东部夏季大气热源显著偏强(偏弱),则长江流域地区的夏季降水显著偏多(偏少),而华南东部地区夏季降水偏少(偏多)。菲律宾南部附近的热带西太平洋暖池区上空夏季大气热源显著偏强(偏弱)时,同期长江中下游地区偏涝(偏旱),而华南地区、江苏北部-山东南部则偏旱(偏涝)。夏季青藏高原东部大气热源异常和热带西太平洋暖池区大气热源异常对Abstract: The relationships between the summer rainfall in China and the atmospheric heat sources over the eastern Tibetan Plateau and the western Pacific warm pool were analyzed comparatively, using the NCEP/NCAR reanalysis daily data. The strong/weak heat source in summer over the eastern Tibetan Plateau will lead to abundant/scarce summer rainfall in the Yangtze River basin, and scarce/abundant summer rainfall in the eastern part of Southern China. While the strong/weak heat source in summer over the western Pacific warm pool will lead to another pattern of abundant/scarce summer rainfall in the middle-lower reaches of the Yangtze River and scarce/abundant summer rainfall in Southern China and in the region of northern Jiangsu to southern Shandong. Comparatively, the heat source over the eastern Tibetan Plateau affects a larger area of summer rainfall than the heat source over the western Pacific. In both cases of the heat source anomalies over the eastern Tibetan Plateau and over the western Pacific, there exist EAP-like teleconnection patterns in East Asia. The summer rainfall in China is influenced directly by the abnormal vertical motion, which is related closely to the abnormal heat sources in the atmosphere. The ridge line of the western Pacific High locates far south/north in summer in the case of strong/weak heat sources over the two areas mentioned above.
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Key words:
- the eastern Tibetan Plateau /
- the western Pacific /
- heat sources /
- summer rainfall
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