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| 东亚海陆热力差指数及其与环流和降水的年际变化关系 | |
| 引用本文： | 孙秀荣,陈隆勋,何金海.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,2002,60(2):164-172. |
| 作者姓名： | 孙秀荣 陈隆勋 何金海 |
| 作者单位： | 1. 上海台风研究所,上海,200030 2. 中国气象科学研究院,北京,100081 3. 南京气象学院大气科学系,南京,210044 |
| 基金项目： | 国家攀登项目A“南海季风试验” |
| 摘 要： | 利用 196 1～ 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 |
| 关 键 词： | 海陆热力差指数 东亚夏季风 夏季降水 年际变化 |
| 收稿时间： | 2001/5/18 0:00:00 |
| 修稿时间： | 2001年5月18日 |
INDEX OF LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO INTERANNUAL VARIATION OF SUMMER CIRCULATION AND RAINFALL OVER EAST ASIAN |
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| Sun Xiurong,Chen Longxun and He Jinhai.INDEX OF LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO INTERANNUAL VARIATION OF SUMMER CIRCULATION AND RAINFALL OVER EAST ASIAN[J].Acta Meteorologica Sinica,2002,60(2):164-172. | |
| Authors: | Sun Xiurong Chen Longxun and He Jinhai |
| Institution: | Shanghai Typhoon Institute, Shanghai 200030;Chinese Academy of Meteorological Sciences, Beijing 100081;Department of Atmospheric Science, Nanjing Institute of Meteorology, Nanjing 210044 |
| Abstract: | An index of land sea thermal difference ( I LSTD ) has been designed to study its relation to the variation of East Asian monsoon circulation in summer.The results are as follows:(1) I LSTD can be used to identify the strength of East Asian summer monsoon.The years of strong(weak) I LSTD are associated with stronger(weaker)summer monsoon circulation.(2)The index also can reflect summer rainfall anomaly over eastern China.In the years of strong I LSTD ,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 rainfall 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 I LSTD has obviously QBO and quasi-4-year and interdecadal oscillations. |
| Keywords: | Index of land sea thermal difference East Asian summer monsoon Summer rainfall over China Interannual variation |
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