中国东部夏季风北界年际变化的东西差异及其影响因子

黄思洁; 李秀珍; 温之平

doi:10.3878/j.issn.1006-9895.1812.18173

中国东部夏季风北界年际变化的东西差异及其影响因子

doi: 10.3878/j.issn.1006-9895.1812.18173

1.
中山大学大气科学学院季风与环境研究中心,广州510275
2.
中山大学大气科学学院季风与环境研究中心,广州510275;中山大学广东省气候变化与自然灾害研究重点实验室,广州510275;江苏省气候变化协同创新中心,南京210023
3.
复旦大学大气科学研究院,上海200438;江苏省气候变化协同创新中心,南京210023;中山大学大气科学学院季风与环境研究中心,广州510275

基金项目: 国家重点基础研究发展计划项目2016YFA0600601，国家自然科学基金项目41775043

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出版历程
- 收稿日期: 2018-06-11

Interannual Variation of Northern Edge of Summer Monsoon in Eastern China: Zonal Discrepancies and Impact Factors

1.
Center for Monsoon and Environment Research, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275
2.
Center for Monsoon and Environment Research, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275;Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University, Guangzhou 510275;Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210023
3.
Institute of Atmospheric Sciences, Fudan University, Shanghai 200438;Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210023;Center for Monsoon and Environment Research, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275

摘要

摘要: 采用1958～2016年JRA-55（Japanese 55-year Reanalysis）月平均再分析资料，利用夏季平均的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位置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位置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，两个区域夏季风北界位置的年际变化具有明显差别。两个区域的夏季风北界位置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，与东北区域北界位置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；影响东北区域夏季风北界位置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。
- 东亚夏季风 /
- 季风北界 /
- 年际变化 /
- 可降水量
Abstract: Based on monthly reanalysis data from the JRA-55 (Japanese 55-year Reanalysis) during the period 1958-2016, the northern edge of the East Asian Summer Monsoon (EASM) is defined by the Precipitable Water (PW) in summer. In this study, the authors used harmonic decomposition, regression analysis, composite analysis, wave activity flux analysis, and other analytical methods to study the interannual variation of the displacement of the northern edge of the EASM. The results show a dramatic west-to-east discrepancy with independent variations over North China (107.5°-115°E) and Northeast China (122.5°-130°E), which are related to an anticyclonic moisture circulation anomaly to the east. The discrepancy related to the location of northern edge in North China lies over the Yellow Sea, and that of Northeast China lies over the northern Sea of Japan. As a result, these two regions experience enhanced transport of southerly moisture and moisture convergence. The abnormal anticyclonic circulation influencing North China is related to the propagation of wave trains in the upper-troposphere mid-high latitudes from the east of Europe. The abnormal anticyclonic circulation affecting Northeast China is due to the asymmetry between the southward-displaced and northward-displaced monsoon edge conditions. The former might be related to the northward propagation of abnormal signals from low latitudes via the East Asia-Pacific teleconnection, whereas the latter might be related to the positive geopotential height anomaly caused by local warming over northeastern Asia.
- East Asian Summer Monsoon /
- Northern edge of monsoon /
- Interannual variation /
- Precipitable water

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