doi:  10.3878/j.issn.1006-9895.1812.18173
东亚夏季风北界年际变化的东西差异 及其影响因子

Interannual Variation of the Northern Edge of the East Asian Summer Monsoon: Zonal Discrepancies and Impact Factors
摘要点击 622  全文点击 215  投稿时间:2018-06-11  修订日期:2018-09-01
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基金:  国家重点研发计划,国家自然科学基金
中文关键词:  东亚夏季风 季风北界 年际变化 可降水量
英文关键词:  East Asian Summer Monsoon, Northern edge of monsoon, Interannual variation, Total precipitable water
        
作者中文名作者英文名单位
黄思洁HUANG SI JIE中山大学
李秀珍LI XIUZHEN中山大学
温之平WEN ZHI PING中山大学
引用:黄思洁,李秀珍,温之平.2019.东亚夏季风北界年际变化的东西差异 及其影响因子[J].大气科学
Citation:HUANG SI JIE,LI XIUZHEN,WEN ZHI PING.2019.Interannual Variation of the Northern Edge of the East Asian Summer Monsoon: Zonal Discrepancies and Impact Factors[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本工作采用1958-2016年JRA-55的月平均再分析资料,利用夏季平均的整层积分可降水量定义了东亚夏季风北界,通过谐波分解、回归分析、合成分析、波活动通量等分析方法,研究了东亚夏季风北界的年际变化特征和东西差异。根据各经度上夏季风活动北界年际变化的一致性可划分为华北区域(107.5 -115°E)和东北区域(122.5 -130°E)两个区域,两个区域季风北界的年际变化具有明显差别。两个区域的季风北界的异常偏北都与东侧的异常反气旋式水汽环流密切相关,与华北区域北界位置密切联系的异常反气旋式水汽环流位于黄海附近,与东北区域北界相关的异常反气旋式水汽环流则位于日本海北部。两个区域分别位于反气旋式环流西侧,受偏南风水汽输送影响,区域水汽输送以及辐合增强。影响华北区域的反气旋式异常与中高纬度波列的传播有关;影响东北区域季风北界偏南年与偏北年的反气旋式环流的可能成因存在非对称性,偏南年对应西北太平洋低纬度正异常高度场以及中纬度负异常高度场,可能受东亚-太平洋遥相关波列的影响;偏北年则对应着东北亚的正异常高度场,可能与局地增温有关。
Abstract:
      Based on the monthly reanalysis data from the JRA-55 during 1958-2016, the northern edge of East Asian summer monsoon (EASM) is defined by summer total precipitable water (TPW). Harmonic decomposition, regression analysis, composite analysis, wave activity flux analysis and other analytical methods are used to study the interannual variation of the displacement of the northern edge of EASM. It shows a dramatic west-to-east discrepancy with the variations over North China (107.5-115°E) and Northeast China (122.5-130°E) independent from each other. Both of them are related to an anticyclonic moisture circulation anomaly to the east. The one related to the northern edge in North China lies over the Yellow Sea, while over the northern Sea of Japan for Northeast China. As a result, two regions are affected by enhanced southerly moisture transport and moisture convergence. The abnormal anticyclonic circulation influencing North China is related to the propagation of wave trains in the mid-high latitudes from the east of Europe at upper troposphere. The causes of the abnormal anticyclonic circulation affecting Northeast China are asymmetric between the southward-displaced and northward-displaced monsoon edge conditions. The former might be related to the northward propagation of abnormal signal from low latitudes via the East Asia-Pacific teleconnection, while the latter might be related to the positive geopotential height anomaly caused by local warming over the northeastern Asia.
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