| 西北太平洋季风槽的季节和年际变化特征及其与热带气旋生成大尺度环境因子的联系 |
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| 引用本文： | 张翔,武亮,皇甫静亮,范广洲,黄荣辉.西北太平洋季风槽的季节和年际变化特征及其与热带气旋生成大尺度环境因子的联系[J].气候与环境研究,2017,22(4):418-434. |
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| 作者姓名： | 张翔 武亮 皇甫静亮 范广洲 黄荣辉 |
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| 作者单位： | 成都信息工程大学大气科学学院, 成都 610225,中国科学院大气物理研究所季风系统研究中心, 北京 100190,中国科学院大气物理研究所季风系统研究中心, 北京 100190,成都信息工程大学大气科学学院, 成都 610225,中国科学院大气物理研究所季风系统研究中心, 北京 100190 |
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| 基金项目： | 国家重点基础研究发展规划项目2014CB953902，国家自然科学基金41475077、41461164005、41230527、41375065 |
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| 摘 要： | 利用ERA-Interim再分析资料分析了夏秋季西北太平洋季风槽的气候特征以及季节和年际变化特征及其对西北太平洋热带气旋和台风(TCs)生成大尺度环境因子的影响。研究结果表明了西北太平洋季风槽有很明显的季节变化,在6~7月,季风槽和强对流活动区在5°N~15°N的南海和西北太平洋西侧上空,并逐渐东伸;到了8~9月,季风槽和强对流活动区向北移动、并向东扩展,一般位于10°N~20°N的南海和西北太平洋西侧、中部上空,有的年份可东伸到西北太平洋东侧,强度加强;到了10~11月,季风槽迅速减弱,并成为涡旋,强对流活动区也向南移和向西收缩。同时,研究还表明了西北太平洋季风槽有明显的年际变化。在季风槽强的年份,季风槽和强对流活动区可以从南海经西北太平洋西侧和中部东伸到西北太平洋的东侧上空;而在季风槽弱的年份,季风槽和强对流活动区主要位于南海和西北太平洋西侧和中部上空,季风槽强度的年际变化对它的季节变化也有重要影响。此外,研究还表明了随着季风槽的季节和年际变化,西北太平洋TCs生成的大尺度环境因子分布也发生很明显的变化。
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| 关 键 词： | 西北太平洋 季风槽 季节变化 年际变化 |
| 收稿时间： | 2016/3/30 0:00:00 |
Seasonal and Interannual Variability of the Western North Pacific Monsoon Trough and Its Relationship to Large-Scale Environmental Factors |
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| ZHANG Xiang,WU Liang,HUANGFU Jingliang,FAN Guangzhou and HUANG Ronghui.Seasonal and Interannual Variability of the Western North Pacific Monsoon Trough and Its Relationship to Large-Scale Environmental Factors[J].Climatic and Environmental Research,2017,22(4):418-434. |
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| Authors: | ZHANG Xiang WU Liang HUANGFU Jingliang FAN Guangzhou and HUANG Ronghui |
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| Institution: | School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225,Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190,Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190,School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225 and Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Abstract: | The seasonal and interannual variability of boreal summer and autumn monsoon trough in the western North Pacific (WNP) and their influence on the large-scale environmental factors of tropical cyclone (TC) formation are examined using the ERA-Interim reanalysis data during 1979-2012. The results suggest that a pronounced seasonal variability of monsoon trough over the WNP is shown. During June-July, the monsoon trough and deep convection over the South China Sea (SCS) and the western WNP in the 5°N-15°N latitudinal band, and are extended eastward. In August and September, the monsoon trough and deep convection shift toward the north and extend eastward and are located over the SCS and the western and central Pacific in the 10°N-20°N latitudinal band. In October and November, the weakened monsoon trough retreats westward and southward. There is an interannual variability in the monsoon trough over the WNP, During the strong (weak) monsoon trough years, the monsoon trough extends eastward (retreats westward). Seasonal monsoon trough activity is influenced by interannual monsoon trough variability. The change of large-scale environmental factors coincides with seasonal and interannual variability of the monsoon trough. |
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| Keywords: | Western North Pacific Monsoon trough Seasonal variation Interannual variation |
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