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Volume 21 Issue 6

Nov.  2004

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2004 >  21(6): 909-922

A Mesoscale Analysis of Heavy Rain Caused by Frontal and Topographical Heterogeneities on Taiwan Island

  • 1.

    Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Chinese Academy of Science, P. O. Box 2861 (7), Beijing,100085,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101


doi: 10.1007/BF02663597

  • The prevailing mesoscale model MM5 (V3) is used to simulate a heavy rain case caused by interaction between a move-in front and topographical heterogeneities on Taiwan Island. It is found that both thermodynamic and dynamic fields along the front are heterogeneous in time and space. The heterogeneity becomes more significant as the effect of topography is added on. The heterogeneous distribution of physical variables along the front is the main reason for the heterogeneous frontal rain band; the optimum cooperation of the low level and upper level jet is another reason for the development of the rain band.Topography can strengthen the rainfall and causes extremely heavy rain cells. Updraft induced by topography extends to a rather low level, while the uplifted air by frontal circulation can reach to higher levels.The quasi-steady topographic circulation overlaps the frontal circulation when the front moves over Taiwan Island; the advantageous cooperation of various mesoscale conditions causes the large upward velocity on the windward side of the island.
  • [1] FU Danhong, GUO Xueliang, 2006: A Cloud-resolving Study on the Role of Cumulus Merger in MCS with Heavy Precipitation, ADVANCES IN ATMOSPHERIC SCIENCES, 23, 857-868.  doi: 10.1007/s00376-006-0857-9
    [2] GAO Shanhong, LIN Hang, SHEN Biao, FU Gang, 2007: A Heavy Sea Fog Event over the Yellow Sea in March 2005: Analysis and Numerical Modeling, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 65-81.  doi: 10.1007/s00376-007-0065-2
    [3] ZHOU Yang, JIANG Jing, Youyu LU, and HUANG Anning, 2013: Revealing the effects of the El Nio-Southern oscillation on tropical cyclone intensity over the western North Pacific from a model sensitivity study, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 1117-1128.  doi: 10.1007/s00376-012-2109-5
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    [8] Xiangzhou SONG, Dexing WU, Xiaohui XIE, 2019: Tides and Turbulent Mixing in the North of Taiwan Island, ADVANCES IN ATMOSPHERIC SCIENCES, 36, 313-325.  doi: 10.1007/s00376-018-8098-2
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    • Manuscript History

    Manuscript received: 10 November 2004
    Manuscript revised: 10 November 2004
    通讯作者: 陈斌, bchen63@163.com
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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    A Mesoscale Analysis of Heavy Rain Caused by Frontal and Topographical Heterogeneities on Taiwan Island

    • 1. Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Chinese Academy of Science, P. O. Box 2861 (7), Beijing,100085,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing,211101
    • Manuscript received: 2004-11-10
    • Manuscript revised: 2004-11-10

    Abstract: The prevailing mesoscale model MM5 (V3) is used to simulate a heavy rain case caused by interaction between a move-in front and topographical heterogeneities on Taiwan Island. It is found that both thermodynamic and dynamic fields along the front are heterogeneous in time and space. The heterogeneity becomes more significant as the effect of topography is added on. The heterogeneous distribution of physical variables along the front is the main reason for the heterogeneous frontal rain band; the optimum cooperation of the low level and upper level jet is another reason for the development of the rain band.Topography can strengthen the rainfall and causes extremely heavy rain cells. Updraft induced by topography extends to a rather low level, while the uplifted air by frontal circulation can reach to higher levels.The quasi-steady topographic circulation overlaps the frontal circulation when the front moves over Taiwan Island; the advantageous cooperation of various mesoscale conditions causes the large upward velocity on the windward side of the island.

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