An Analysis of the Eddy Kinetic Energy Budget of a Southwest Vortex during Heavy Rainfall over South China
An Analysis of the Eddy Kinetic Energy Budget of a Southwest Vortex during Heavy Rainfall over South China
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DOI：
10.1080/16742834.2009.11446791
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发表时间：
2009-01
影响因子：
2.3
通讯作者：
Fu Shenming;Sun Jianhua;Zhao Sixiong;Liang Wan-li
中科院分区：
文献类型：
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作者：
Fu Shenming;Sun Jianhua;Zhao Sixiong;Liang Wan-li
利用美国国家环境预报中心/美国国家大气研究中心（NCEP/NCAR）1°×1°分辨率的6小时再分析资料，计算了引起广西华南暴雨的西南低涡（SWV）的涡动动能（EKE）收支。结果表明：（1）西南涡是一种副热带涡旋，兼有热带涡旋和温带涡旋的特征。(b)在研究的情况下，大尺度环流和其他扰动场有助于形成和发展的SWV。(c)当西南气流从弱的大尺度环流EKE区向强的大尺度环流EKE区移动时，西南气流的EKE增大，反之亦然。(d)次网格过程和摩擦耗散是SWV EKE的主要汇，对SWV的衰减有贡献。(e)残差项（RES）和总量（EKE方程中除RES外的所有右侧项的综合效应）的变化趋势几乎相同，这使得EKE保持在一个温和的方式变化。(f)550 ~ 850 hPa的EKE增强最强，对应于西南涡的垂直拉伸。
Abstract Based on the 6-hour-interval reanalysis data with 1°×1° resolution from the National Center for Environmental Prediction/the National Center for Atmospheric Research (NCEP/NCAR), the eddy kinetic energy (EKE) budget of a southwest vortex (SWV) that caused heavy rainfall in Guangxi over South China (from 1200 UTC 11 to 0000 UTC 13 June) is calculated. The results are as follows: (a) The SWV is a kind of subtropical vortex, with characteristics of both an extratropical vortex and a tropical vortex. (b) In the case examined, large-scale circulation and other perturbation fields contributed to the formation and development of the SWV. (c) When the SWV moved from weak large-scale circulation EKE areas to strong ones, the EKE of the SWV increased, and vice versa. (d) Sub-grid processes and frictional dissipation were the main sinks of the SWV EKE, which contributed to the decay of the SWV. (e) The residual term (RES) and the Total (composite effect of all right hand side (rhs) terms except the RES in the EKE equation) varied almost in the same tendency, which kept the EKE varying in a moderate way. (f) The EKE between 550 hPa and 850 hPa increased most intensively, corresponding to the vertical stretching of the SWV.