| An Index Measuring the Interannual Variation of the East Asian Summer Monsoon ——The EAP Index |
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| 作者姓名： | HUANG Gang |
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| 作者单位： | RCE-TEAandLASG,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029 |
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| 基金项目： | This study was supported jointly by the National Key Basic Research Development Program，中国科学院知识创新工程项目，国家自然科学基金，the Western Project of the CAS |
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| 摘 要： | Based on the EAP (East Asia/Pacific) teleconnection in the summer circulation anomalies over ther Northern Hemisphere, an index measuring the strength of the East Asian summer monsoon, i.e., the so-called EAP index, is defined in this paper. From the analyses of observed data, it is clearly shown that the EAP index defined in this study can well describe the interannual variability of summer rainfall and surface air temperature in East Asia, especially in the Yangtze River valley and the Huaihe River valley, Korea,and Japan. Moreover, this index can also reflect the interannual variability of the East Asian summer monsoon system including the monsoon horizontal circulation and the vertical-meridional circulation cell over East Asia. From the composite analyses of climate and monsoon circulation anomalies for high EAP index and for low EAP index, respectively, it is well demonstrated that the EAP index proposed in this study can well measure the strength of the East Asian summer monsoon.
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| 关 键 词： | 探测指标 东亚地区 夏季 降雨 大气温度 环流 季风 |
An index measuring the interannual variation of the East Asian summer monsoon—The EAP index |
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| HUANG Gang.An index measuring the interannual variation of the East Asian summer monsoon—The EAP index[J].Advances in Atmospheric Sciences,2004,21(1):41-52. |
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| Authors: | HUANG Gang |
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| Institution: | RCE-TEA and LASG,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 |
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| Abstract: | Based on the EAP (East Asia/Pacific) teleconnection in the summer circulation anomalies over the Northern Hemisphere,an index measuring the strength of the East Asian summer monsoon,i.e.,the socalled EAP index,is defined in this paper.From the analyses of observed data,it is clearly shown that the EAP index defined in this study can well describe the interannual variability of summer rainfall and surfaceair temperature in East Asia,especially in the Yangtze River valley and the Hualhe River valley,Korea,and Japan.Moreover,this index can also reflect the interannual variability of the East Asian summer monsoon system including the monsoon horizontal circulation and the vertical-merldional circulation cell over East Asia.From the composite analyses of climate and monsoon circulation anomalies for high EAP index and for low EAP index,respectively,it is well demonstrated that the EAP index proposed in this study can well measure the strength of the East Asian summer monsoon. |
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| Keywords: | East Asia/Pacific index1 East Asian summer mozmoon interannual variability |
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