| 雅鲁藏布江河谷盛夏降水年际变化及其与环流的联系 |
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| 引用本文： | 边巴卓嘎,赤曲,周顺武,吴萍,孙阳.雅鲁藏布江河谷盛夏降水年际变化及其与环流的联系[J].大气科学学报,2022,45(3):469-479. |
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| 作者姓名： | 边巴卓嘎 赤曲 周顺武 吴萍 孙阳 |
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| 作者单位： | 南京信息工程大学 气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心, 江苏 南京 210044;西藏自治区气象台, 西藏 拉萨 850000;国家气候中心, 北京 100081 |
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| 基金项目： | 国家重点研发计划项目（2018YFC1505705）；国家自然科学基金资助项目（41801017；42030611；42165005）；第二次青藏高原综合科学考察研究项目（2019QZKK0208；2019QZKK0106） |
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| 摘 要： | 基于近57 a （1961—2017年）西藏雅鲁藏布江中游河谷地区（简称雅江河谷）4个站（拉萨、日喀则、泽当和江孜）盛夏（7—8月）月平均降水和同期NCEP/NCAR再分析资料，采用合成、相关分析等统计诊断方法，分析了雅江河谷盛夏降水的年际变化特征及其与大气环流的联系。结果表明：1）近57 a雅江河谷盛夏降水无显著线性趋势，降水主要以3～4 a显著周期的年际振荡为主。2）雅江河谷盛夏降水年际波动与区域内水汽收支的变化直接相关，其中印度半岛-东南亚异常反气旋引起的水汽输送通量和水汽在高原腹地辐合上升的动力过程是盛夏降水年际变化的主要原因。3）对流层中低层印度半岛-东南亚异常反气旋环流是该地区盛夏降水年际异常的重要水汽输送通道，该通道将西太平洋、南海和孟加拉湾等地水汽不断输送到高原，期间西太副高和伊朗高压等大尺度系统异常对水汽输送过程起到了重要作用，同时高原盛夏季风低压和南亚高压异常给水汽在高原腹地辐合抬升提供了动力条件。
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| 关 键 词： | 雅鲁藏布江河谷 盛夏降水 年际变化 水汽输送 大气环流 |
| 收稿时间： | 2020/10/10 0:00:00 |
| 修稿时间： | 2021/3/30 0:00:00 |
Interannual variations of midsummer precipitation in the Yarlung Zangbo River valley area and its relationship with circulation |
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| BIANBA Zhuog,CHI Qu,ZHOU Shunwu,WU Ping,SUN Yang.Interannual variations of midsummer precipitation in the Yarlung Zangbo River valley area and its relationship with circulation[J].大气科学学报,2022,45(3):469-479. |
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| Authors: | BIANBA Zhuog CHI Qu ZHOU Shunwu WU Ping SUN Yang |
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| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science & Technology, Nanjing 210044, China;Meteorological Observatory of Tibet Autonomous Region, Lhasa 850000, China;National Climate Centre, Beijing 100081, China |
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| Abstract: | In this study, based on the average precipitation of the summer (July-August) and the NCEP/NCAR atmospheric circulation data of four stations (Lhasa, Shigatse, Zedang and Jiangzi) in the middle reaches of the Yarlung Zangbo River in the hinterland of the Tibet Plateau over the past 57 years (1961-2017), synthesis, correlation analysis and other methods are used to analyze the interannual variation characteristics of summer precipitation in the region, along with its possible causes.The results show the following:1) There is no significant linear trend in the summer precipitation in the region during the past 57 years, and the interannual oscillations of the significant period around 3 a are dominant.2) The interannual variation of summer precipitation in the region is directly related to the amount of the water vapor budget in the region.The anomalous anti-cyclonic water vapor flux transport in the Indian Peninsula-Southeast Asia and the dynamic process of water vapor in the plateau hinterland are the main reasons for the interannual oscillations of midsummer precipitation.3) The troposphere in the bottom of the Indian Peninsula-Southeast Asia anomalous anticyclonic circulation is an important water vapor transport channel for the interannual anomalies of midsummer precipitation in the region.The channel continuously transports water vapor to the plateau in the western Pacific, South China Sea and Bay of Bengal.During this period, large-scale system anomalies, such as the West Pacific subtropical high and the Iranian high pressure, played an important role in the water vapor transport process.At the same time, the plateau and the summer monsoon low pressure and South Asia high pressure provided the dynamic conditions for the water vapor to rise and rise in the plateau hinterland. |
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| Keywords: | Yarlung Zangbo River valley midsummer precipitation interannual variations water vapor transport atmospheric circulation |
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