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中国春季典型降水异常及相联系的大气水汽输送
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国家自然科学基金资助项目40625014、40221503, 优秀国家重点实验室研究项目基金40523001, 国家重点基础研究发展规划项目2006CB403603


Atmospheric Water Vapor Transport and Corresponding Typical Anomalous Spring Rainfall Patterns in China
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    摘要:

    利用经验正交函数分解方法, 揭示了中国春季典型降水异常型的分布特征, 讨论了对应的水汽输送场和大尺度环流形势。结果表明, 降水异常的前三个模态对应的异常水汽输送源地都与气候平均源地存在差异。第一模态中, 降水大值区位于华南沿海, 伴随西太平洋副高的加强以及东亚西风急流的西南向移动, 水汽主要来源于菲律宾和中国南海地区; 第二模态中, 降水大值区位于长江中下游地区, 西太平洋副高及东亚西风急流均较气候平均位置偏北, 水汽主要来源于赤道西太平洋, 同时赤道印度洋的西风水汽输送也为降水提供了部分水汽; 第三模态中, 降水中心位于黄淮流域, 500 hPa高压异常中心北移至日本海附近, 同时东亚西风急流大大减弱, 水汽源地位于中纬度西北太平洋。在气候平均态下, 来自青藏高原南缘的西风水汽输送是中国春季降水的重要水汽源地之一, 但与此输送带对应的异常输送, 在与前三个降水异常典型模态所对应的水汽输送异常场中均没有体现。

    Abstract:

    The atmospheric water vapor transports associated with typical anomalous spring rainfall patterns have been investigated using NCEP/NCAR, ERA40 monthly mean reanalysis data and precipitation data of 160 stations in China during 1951-1999. Results show that origins of water vapor supply related to anomalous rainfall patterns are different from the climate mean situation. In anomalous pattern 1, with a heavier rainbelt along the South China coast, the main moisture comes from the Philippine Sea and the adjacent South China Sea. The background large-scale circulation changes include the intensification of the western Pacific subtropical high (WPSH) and the southwest shift of the East Asian jet stream (EAJS). In anomalous pattern 2, with a main rainbelt along the middle and lower reaches of the Yangtze River, the origins of water vapor supply contain the western tropical Pacific and the tropical Indian Ocean. Both the WPSH and the EAJS move to the north of their normal position. In anomalous pattern 3, a rainy region is located in the Huaihe River valley. The moisture originates from the northwestern Pacific. The 500-hPa anticyclone anomaly moves to northeastern China and the EAJS is weaker than its normal condition. Although water vapor transport along the southern edge of the Tibetan Plateau is one of the main branches in the climate mean pattern, none of the typical water vapor transport related to typical anomalous rainfall reflects this water vapor flow.

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张洁,周天军,宇如聪,等.中国春季典型降水异常及相联系的大气水汽输送.大气科学,2009,33(1):121~134 ZHANG Jie,ZHOU Tianjun,YU Rucong,et al.Atmospheric Water Vapor Transport and Corresponding Typical Anomalous Spring Rainfall Patterns in China.Chinese Journal of Atmospheric Sciences (in Chinese),2009,33(1):121~134

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  • 在线发布日期: 2012-04-19
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