| 亚洲热带气候态夏季风涌传播特征及其对中国降水的影响 |
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| 引用本文： | 任菊章,郑彬,金燕,琚建华.亚洲热带气候态夏季风涌传播特征及其对中国降水的影响[J].热带气象学报,2022,38(2):171-179. |
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| 作者姓名： | 任菊章 郑彬 金燕 琚建华 |
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| 作者单位： | 1.云南省气象科学研究所，云南 昆明 650034 |
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| 基金项目： | 广东省基础与应用基础研究重大项目2020B0301030004国家自然科学基金项目41965005国家自然科学基金项目42075013国家重点研发计划2018YFC1507603 |
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| 摘 要： | 基于1979—2020年逐日的NOAA向外长波辐射资料、NCEP/NCAR再分析风场资料，以及全球CMAP再分析降水资料，探讨了气候态亚洲热带夏季风涌的传播过程及与我国夏季相应的降水联系。分析结果表明，主汛期亚洲热带气候态夏季风季节内振荡(CISO)活动是亚洲夏季风活动的主要特征，随时间北传的亚洲热带夏季风CISO称为亚洲热带夏季风涌，主要有南亚夏季风涌和南海夏季风涌。亚洲热带夏季风涌的传播可分为四个阶段。在亚洲热带夏季风涌的发展阶段，印度洋区域低频气旋与对流活跃，孟加拉湾和南海热带区域被低频东风控制，我国大部分地区无降水发生，降水中心位于两广地区。当进入亚洲热带夏季风涌活跃阶段，孟加拉湾和南海热带地区低频气旋和对流活跃，东亚低频“PJ”波列显著，我国降水中心北移到长江以南的附近区域。亚洲热带夏季风涌减弱阶段，孟加拉湾与南海低频气旋消亡，对流减弱，低频西风加强，日本南部附近为低频反气旋控制，我国长江中下游低频南风活跃，降水中心也北移到长江中下游地区，而华南地区已基本无降水，此阶段的大气低频环流场与亚洲热带夏季风涌发展阶段基本相反。进入亚洲热带夏季风涌间歇阶段时，孟加拉湾和南海热带地区低频反气旋活跃，对流不显著，日本南部附近的低频反气旋北移减弱，我国东部基本在低频南风的控制下，降水中心也逐步北移到华北-朝鲜半岛一带，此时的大气低频环流场与亚洲季风涌活跃阶段基本相反。
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| 关 键 词： | 亚洲热带夏季风涌 气候态季节内振荡 夏季降水 中国南方 |
| 收稿时间： | 2020-11-25 |
CHARACTERISTICS OF ASIAN TROPICAL SUMMER MONSOON SURGE AND ITS INFLUENCE ON PRECIPITATION IN CHINA |
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| REN Juzhang,ZHENG Bin,JIN Yan,JU Jianhua.CHARACTERISTICS OF ASIAN TROPICAL SUMMER MONSOON SURGE AND ITS INFLUENCE ON PRECIPITATION IN CHINA[J].Journal of Tropical Meteorology,2022,38(2):171-179. |
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| Authors: | REN Juzhang ZHENG Bin JIN Yan JU Jianhua |
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| Affiliation: | 1.Yunnan Institute of Meteorological Science, Kunming 650034, China2.Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510641, China3.Yunnan Climate Centre, Kunming 650034, China |
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| Abstract: | This paper discusses the propagation process of tropical Asian summer monsoon surge and its correlation with China's summer precipitation based on the daily outgoing longwave radiation data from NOAA, NCEP/NCAR wind field reanalysis data and CMAP global precipitation data from 1979 to 2020. The results show that the tropical Asian summer monsoon (TASM) climatic intra-seasonal oscillation (CISO) during the main rainy season is an important feature of Asian summer monsoon activities. The northward propagation of the TASM CISO is called "the tropical Asian summer monsoon surge", which consists of the South Asian monsoon surge and the South China Sea monsoon surge. The northward propagation of the summer monsoon surge can be divided into four stages. At the developmental stage, low-frequency cyclones and convection are active over the Indian Ocean region. Low-frequency easterly winds prevail over the Bay of Bengal and the South China Sea tropical region. Most parts of China see no precipitation, with the precipitation center being in Guangdong and Guangxi. At the active stage, lowfrequency cyclones and convection are active over the Bay of Bengal and the tropical areas of the South China Sea. The East Asian low-frequency "PJ" wave train is prominent, with China's precipitation center moving northward to the southern areas of the Yangtze River. At the abating stage, low-frequency cyclones die out over the Bay of Bengal and the South China Sea, with the convection weakening and the lowfrequency westerly strengthening. Low-frequency anticyclones prevail around southern Japan. Lowfrequency southerly winds are active in the middle and lower reaches of China's Yangtze River, with the precipitation center moving northward to the middle and lower reaches of the Yangtze River. South China basically sees no precipitation. The low-frequency atmospheric circulation field at this stage is basically opposite to that at the development stage. At the intermittent stage, the low-frequency anticyclones over the Bay of Bengal and the tropical South China Sea are active, with convection being not evident. The northward propagation of the low-frequency anticyclones near southern Japan weakens. Low-frequency southerly winds prevail in eastern China, with the precipitation center gradually moving northward to the North China-Korean Peninsula region. The low-frequency atmospheric circulation field at this point is basically opposite to that at the active stage. |
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| Keywords: | tropical Asian summer monsoon surge climatic intraseasonal oscillation summer precipitation south China |
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