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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1.南京信息工程大学大气科学学院/西藏自治区气象台;2.南京信息工程大学大气科学学院;3.国家气候中心

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Interannual Variations of Midsummer Precipitation in the Yarlung Zangbo River Valley Area and Its Relationship with Circulation
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1.Academy of Atmospheric Sciences, Nanjing University of information science and technology/Meteorological station of Tibet Autonomous Region;2.Meteorological station of Tibet Autonomous Region;3.Academy of Atmospheric Sciences, Nanjing University of information science and technology;4.National Climate Center

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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环流的联系。结果表明:(1)近57 a来雅江河谷盛夏降水无显著线性趋势,降水主要以3-4 a左右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—东南亚异常反气旋水汽通量输送和水汽在高原腹地辐合上升的动力过程是盛夏降水年际的主要原因。(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。

    Abstract:

    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 in the past 57 years (1961-2017), Synthesis, correlation analysis and other methods, analyzed the interannual variation characteristics of summer precipitation in the region and its possible causes. The results show that: (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 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 interannual oscillations of midsummer precipitation. main reason. (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 the 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 the South Asia high pressure provide the dynamic conditions for the water vapor to rise and rise in the plateau hinterland.

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  • 收稿日期:2020-10-10
  • 最后修改日期:2020-12-11
  • 录用日期:2021-03-30
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