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张文龙, 崔晓鹏, 董剑希. 对流层中层中尺度对流涡旋在台风榴莲(2001)生成中的作用——模拟诊断分析[J]. 大气科学, 2010, 34(1): 45-57. DOI: 10.3878/j.issn.1006-9895.2010.01.05
引用本文: 张文龙, 崔晓鹏, 董剑希. 对流层中层中尺度对流涡旋在台风榴莲(2001)生成中的作用——模拟诊断分析[J]. 大气科学, 2010, 34(1): 45-57. DOI: 10.3878/j.issn.1006-9895.2010.01.05
ZHANG Wenlong, CUI Xiaopeng, DONG Jianxi. The Role of Middle Tropospheric Mesoscale Convective Vortex in the Genesis of Typhoon Durian (2001)—Diagnostic Analysis of Simulated Data[J]. Chinese Journal of Atmospheric Sciences, 2010, 34(1): 45-57. DOI: 10.3878/j.issn.1006-9895.2010.01.05
Citation: ZHANG Wenlong, CUI Xiaopeng, DONG Jianxi. The Role of Middle Tropospheric Mesoscale Convective Vortex in the Genesis of Typhoon Durian (2001)—Diagnostic Analysis of Simulated Data[J]. Chinese Journal of Atmospheric Sciences, 2010, 34(1): 45-57. DOI: 10.3878/j.issn.1006-9895.2010.01.05

对流层中层中尺度对流涡旋在台风榴莲(2001)生成中的作用——模拟诊断分析

The Role of Middle Tropospheric Mesoscale Convective Vortex in the Genesis of Typhoon Durian (2001)—Diagnostic Analysis of Simulated Data

  • 摘要: 本文基于PSU/NCAR MM5中尺度模式对台风榴莲 (2001) 生成过程成功的数值模拟, 利用模式输出的较高时空分辨率资料, 对台风榴莲生成过程中对流层中层中尺度对流涡旋 (MCV) 的作用进行了诊断分析。结果表明, 中层MCV在台风榴莲生成中的作用有三个重要方面: 第一, 中尺度组织化作用: 伴随中层MCV的垂直次级环流圈, 使得区域内的积云对流热塔趋向于逐步在中心区域集中, 热塔相互之间容易发生相互作用, 通过合并过程有些热塔得到加强, 而有些趋于消亡。同时, 热塔聚集后的群体效应反馈作用又使得中层MCV加强或维持, 进一步促进热塔的合并以及向轴对称化发展; 第二, 存贮效应: 因为中层MCV的生命史比积云对流热塔长, 能够将消亡对流热塔所携带的热量、 水汽、 涡度加以存贮和保留, 使得中层MCV区域向有利于TC生成的方向发展, 最终成为TC环流的 “胚胎”; 第三, 中层MCV与对流层低层的槽 (涡旋) 以及对流热塔之间通过相互作用, 共同实现中低层系统的垂直耦合。

     

    Abstract: Based on the successful numerical simulation of typhoon Durian (2001) with the PSU/NCAR nonhydrostatic mesoscale model (MM5), the authors diagnose the contributions of middle tropospheric mesoscale convective vortex (MCV) to the Durian's genesis using the high resolution data (6 km) produced by MM5. The results show that the MCV have three important performances. First, playing the role of mesoscale organization system, the second vertical cycle of MCV transports the convective hot towers to the central area of MCV, making the hot towers have the trend to contest or merge each other, so that some hot towers become stronger or died. The feedback of the collective effect of hot towers makes the MCV intensify or maintain, and the MCV further pushes the assembling, merging and axisymmetrization of hot towers. Second, playing the role of memory system, because the MCV have the longer life time than individual hot tower, the MCV can reserve the heat, moisture, and vorticity left by the died hot towers, which will make the MCV area favorable to the TC genesis, and ultimately become the ‘embryo’ of Durian. Third, the MCV, the low tropospheric trough (vortex), and the hot towers conduct together the vertical uniformization between the lower and middle tropospheric systems through their interaction.

     

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