| INTERANNUAL VARIATION OF INDEX OF EAST ASIAN LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO MONSOON CIRCULATION AND RAINFALL OVER CHINA |
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| 作者姓名： | 孙秀荣 陈隆勋 何金海 |
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| 作者单位： | Shanghai Typhoon Institute Shanghai 200030，Chinese Academy of Meteorological Sciences，Beijing 100081，Department of Atmospheric Sciences.Nanjing Institute of Meteorology，Nanjing 210044 |
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| 基金项目： | Supported by the South China Sea Monsoon Experiment,Climbing Programme“A”of China. |
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| 摘 要： | This paper proposes an index of land-sea thermal difference(ILSTD)that describes its zonal andmeridional strength responsible for East Asian monsoon circulation to study its relation to the EastAsian monsoon circulation and the summer rainfall over China on an interannual basis.Results are asfollows:(1)ILSTD can be used to measure the strength of East Asian summer monsoon in such away that the strong(weak)ILSTD years are associated with strong(weak)summer monsooncirculation.(2)The index also reflects well summer rainfall anomaly over the eastern part of China.In the strong index years,rain belt is mainly located over the northern China,and serious droughtemerges in the Jianghuai valleys and mid-lower reaches of the Changjiang River,along with increaseof rainfall in North and South China,but in the weak years it is contrary.(3)Besides,the index hasobvious QBO and quasi 4-year oscillations,but the periods and amplitudes have significant changes onan interdecadal basis.
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INTERANNUAL VARIATION OF INDEX OF EAST ASIAN LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO MONSOON CIRCULATION AND RAINFALL OVER CHINA |
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| SUN Xiurong Shanghai Typhoon Institute,Shanghai CHEN Longxun Chinese Academy of Meteorological Sciences,Beijing HE Jinhai.INTERANNUAL VARIATION OF INDEX OF EAST ASIAN LAND-SEA THERMAL DIFFERENCE AND ITS RELATION TO MONSOON CIRCULATION AND RAINFALL OVER CHINA[J].Acta Meteorologica Sinica,2001(1). |
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| Authors: | SUN Xiurong Shanghai Typhoon Institute Shanghai CHEN Longxun Chinese Academy of Meteorological Sciences Beijing HE Jinhai |
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| Institution: | SUN Xiurong Shanghai Typhoon Institute,Shanghai 200030CHEN Longxun Chinese Academy of Meteorological Sciences,Beijing 100081HE Jinhai Department of Atmospheric Sciences.Nanjing Institute of Meteorology,Nanjing 210044 |
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| Abstract: | This paper proposes an index of land-sea thermal difference(ILSTD)that describes its zonal and meridional strength responsible for East Asian monsoon circulation to study its relation to the East Asian monsoon circulation and the summer rainfall over China on an interannual basis.Results are as follows:(1)ILSTD can be used to measure the strength of East Asian summer monsoon in such a way that the strong(weak)ILSTD years are associated with strong(weak)summer monsoon circulation.(2)The index also reflects well summer rainfall anomaly over the eastern part of China. In the strong index years,rain belt is mainly located over the northern China,and serious drought emerges in the Jianghuai valleys and mid-lower reaches of the Changjiang River,along with increase of rainfall in North and South China,but in the weak years it is contrary.(3)Besides,the index has obvious QBO and quasi 4-year oscillations,but the periods and amplitudes have significant changes on an interdecadal basis. |
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| Keywords: | index of land-sea thermal difference(ILSTD) interannual variation East Asian summer monsoon summer rainfall over China |
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