Effects of Asymmetric Latent Heating on Typhoon Movement Crossing Taiwan: The Case of Morakot (2009) with Extreme Rainfall
Effects of Asymmetric Latent Heating on Typhoon Movement Crossing Taiwan: The Case of Morakot (2009) with Extreme Rainfall
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DOI：
10.1175/jas-d-11-0346.1
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发表时间：
2012-11
影响因子：
3.1
通讯作者：
Chung‐Chieh Wang;H. Kuo;Y. Chen;H. Huang;Chao Hsuan Chung;K. Tsuboki
中科院分区：
文献类型：
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作者：
Chung‐Chieh Wang;H. Kuo;Y. Chen;H. Huang;Chao Hsuan Chung;K. Tsuboki
摘要2009年8月6-9日，莫拉克台风袭击台湾，造成近50年来最大降雨量（近3000 mm）和最严重的损失。台风-季风气流与中尺度对流的相互作用、季风气流的水汽供应以及风暴移动速度的缓慢是造成这次暴雨破纪录的主要原因。对台风路径的分析显示，虽然转向气流的速度确实很慢，但在8月8日登陆后降雨量最大的时期，其移动速度仍超过台风移动速度约5 km h − 1。本研究利用解云风暴模拟器（CReSS）研究一场缓慢移动的风暴离开台湾后向西北偏北方向移动的动力学。在3公里网格下的控制模拟结果与观测结果比较，包括路径、慢速、不对称降水型、中尺度对流和台湾地区的降水分布。敏感性试验减少MOI.
AbstractTyphoon Morakot struck Taiwan during 6–9 August 2009, and it produced the highest rainfall (approaching 3000 mm) and caused the worst damage in the past 50 yr. Typhoon–monsoon flow interactions with mesoscale convection, the water vapor supply by the monsoon flow, and the slow moving speed of the storm are the main reasons for the record-breaking precipitation. Analysis of the typhoon track reveals that the steering flow, although indeed slow, still exceeded the typhoon moving speed by approximately 5 km h−1 (1 km h−1 = 0.28 m s−1) during the postlandfall period on 8 August, when the rainfall was the heaviest. The Cloud-Resolving Storm Simulator (CReSS) is used to study the dynamics of the slow storm motion toward the north-northwest upon leaving Taiwan. The control simulations with 3-km grid size compare favorably with the observations, including the track, slow speed, asymmetric precipitation pattern, mesoscale convection, and rainfall distribution over Taiwan. Sensitivity tests with reduced moi...