孙秀荣,陈隆勋,何金海. 2002. 东亚海陆热力差指数及其与环流和降水的年际变化关系[J]. 气象学报, 60(2):164-172, doi:10.11676/qxxb2002.020
东亚海陆热力差指数及其与环流和降水的年际变化关系
INDEX OF LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO INTERANNUAL VARIATION OF SUMMER CIRCULATION AND RAINFALL OVER EAST ASIAN
投稿时间:2001-05-18  修订日期:2001-08-07
DOI:10.11676/qxxb2002.020
中文关键词:  海陆热力差指数  东亚夏季风  夏季降水  年际变化
英文关键词:Index of land sea thermal difference  East Asian summer monsoon  Summer rainfall over China  Int erannual variation
基金项目:国家攀登项目A“南海季风试验”
作者单位
孙秀荣 上海台风研究所, 上海, 200030 
陈隆勋 中国气象科学研究院, 北京, 100081 
何金海 南京气象学院大气科学系, 南京, 210044 
摘要点击次数: 1918
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中文摘要:
      利用1961~1999年海温和地温月平均资料,定义了一个海陆热力差指数,来表示东亚季风环流的纬向和经向海陆热力差异的变化强度,研究了夏季指数与东亚夏季风环流场和中国东部夏季降水的年际变化关系。结果表明:(1)海陆热力差指数可用来表示东亚夏季风的强弱变化。强指数年东亚季风区低空西南夏季风气流和高层的东风气流明显偏强,表明这一年夏季风偏强,弱指数年反之。(2)海陆热力差指数能较好地反映东部季风区夏季降水的异常状况。强指数年,雨带偏北,江淮流域和长江中下游明显干旱,华南、华北降水偏多,弱指数年反之。这一降水异常特征可以从强弱海陆热力差指数年的环流场得到解释。(3)海陆热力差指数所反映的东亚夏季风具有明显的准2a和3~6a周期的年际振荡,但其振幅和周期具有显著的年代际异常。
英文摘要:
      An index of land-sea thermal difference (ILSTD) has been designed to study its relation to the variation of East Asian monsoon circulation in summer. The results are as follows:(1) ILSTD can be used to identify the strength of East Asian summer monsoon. The years of strong(weak) ILSTD Dare associated with stronger(weaker) summer monsoon circulation. (2) The index also can reflect summer rainfall anomaly over eastern China. In the years of strong ILSTD, rainfall belt is mainly located over northern China, and obvious drought emerges in Huaihe River valleys and the mid-lower reaches of Yangtze River. However, during the weak years, summer monsoon is weak and summer rainf all belt is located over the mid-lower reaches of Yangtze River. The circulation fields of strong (weak) index years can explain the features of rainfall anomaly. (3) Besides, the ILSTD has obviously QBO and quasi-4-year and interdecadal oscillations.
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