| 东亚海陆热力差指数与中国夏季降水的关系 |
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| 引用本文： | 孙秀荣,何金海,陈隆勋.东亚海陆热力差指数与中国夏季降水的关系[J].南京气象学院学报,2000,23(3):378-384. |
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| 作者姓名： | 孙秀荣 何金海 陈隆勋 |
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| 作者单位： | 1. 南京气象学院大气科学系,南京,210044
2. 中国气象科学研究院,北京,100081 |
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| 基金项目： | 国家科技部攀登项目!“南海季风试验”资助 |
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| 摘 要： | 定义了东亚海陆热力差指数（ＩＬＳＴＤ），讨论了它与东亚夏季风的强弱年际变化及夏季降水的关系。结果表明：该海陆热力差指数较好地反映了我国东部季风区夏季降水的异常变化、强海陆热力差指数年，华北地区降水偏多，长江、淮河流域明显干旱；弱海陆热力差指数年，长江，淮河流域降水又异常偏多。ＴＬＳＴＤ的异常变化对影响我国东部季风区降水的大气环流型具有较强的识别力，尤其是对夏季西太平洋副热带高压的位置与强度的识别。
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| 关 键 词： | 海陆热力差指数 年际变化 中国 夏季降水 |
| 修稿时间： | 1999-12-27 |
RELATIONSHIP BETWEEN INDEX OF LAND-SEA THERMAL DIFFERENCE AND SUMMER RAINFALL IN CHINA |
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| Sun Xiurong,He Jinhai,Chen Longxun.RELATIONSHIP BETWEEN INDEX OF LAND-SEA THERMAL DIFFERENCE AND SUMMER RAINFALL IN CHINA[J].Journal of Nanjing Institute of Meteorology,2000,23(3):378-384. |
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| Authors: | Sun Xiurong He Jinhai Chen Longxun |
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| Abstract: | In this paper,an index of land-sea therma l difference (I LSTD ) is developed with the relationship among index,th e east Asian monsoon circulation and the summer rainfall in China discussed.The results are as follows: 1) I LSTD can reflect the interannual variation of the summer rainfall anomaly over eastern China, especially in north China an d Huaihe valleys and the mid/low reaches of the Yangtze River.In the years of st rong I LSTD ,rainfall belt is mainly located over north part of China, a nd obvious drought emerges in Huaihe valleys and the mid/low reaches of the Yang tze River. However, during the weak years, summer rainfall belt is largely locat ed over the mid/low reaches of the Yangtze River.2)The index can identify the pa ttern of atmospheric circulation impacting rainfall in eastern China,especially for the position and strength of west Pacific subtropical high in summer.In the strong (weak) index years,the circulation fields at 500hPa in the n orthern hemisphere can be used to explain the features of the strength changes o f the summer monsoon and the summer rainfall anomaly. |
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| Keywords: | index of land-sea thermal difference inte rannual variation east Asian summer monsoon summer rainfall in China |
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