A diagnostic study on heavy rainfall induced by Typhoon Utor (2013) in South China: 1. Rainfall asymmetry at landfall
A diagnostic study on heavy rainfall induced by Typhoon Utor (2013) in South China: 1. Rainfall asymmetry at landfall
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2013年台风“尤特”华南地区强降雨诊断研究：1、登陆时降雨不对称
DOI：
10.1002/2015jd024646
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发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
yuqing wang
中科院分区：
文献类型：
--
作者：
weiguang meng;yuqing wang
2013年8月11日袭击菲律宾后，台风“尤特”于8月14日第二次登陆华南地区，并带来强降雨，登陆后造成大面积损失。与乌托尔相关的强降雨包括三个主要事件：登陆时降雨、内核区登陆后降雨以及西南季风气流增强引起的登陆后降雨。第 1 部分使用地表中观网观测和高分辨率欧洲中期天气预报中心中期再分析 (ERA-Interim) 数据对登陆时的降雨进行分析和诊断。结果表明，乌托尔接近并在华南南部沿海登陆时，处于深层（200~850hPa）东偏东北风垂直风切变（VWS）环境中，强降雨多发生在其西南象限的下切变中。在对流可用势能适中、低层VWS适中的有利环境下，尤托尔西南象限发现了由内陆向北对流层中下层干空气入侵引发的地表冷池。锋生和准平衡、地转 Q 向量诊断都表明，地表冷冷附近的准平衡强迫有助于增强乌托尔西南象限的对流。结论是，环境VWS和由此产生的地表冷池动力学对尤托尔在华南南部沿海登陆时的降雨不对称性起着重要作用。
After striking the Philippines on 11 August 2013, Typhoon Utor made its second landfall over southern South China on 14 August and brought heavy rainfall, causing widespread damages after its landfall. The heavy rainfall associated with Utor includes three main episodes: rainfall at landfall, postlandfall rainfall in the inner core region, and postlandfall rainfall induced by the intensification of southwesterly monsoon flow. In part 1 the rainfall at landfall is analyzed and diagnosed using the surface mesonet observations and the high‐resolution European Centre for Medium‐Range Weather Forecasting Interim reanalysis (ERA‐Interim) data. Results show that when Utor approached and made landfall over the southern coast of South China, it was embedded in a deep‐layer (200–850 hPa) easterly northeasterly vertical wind shear (VWS) environment with heavy rainfall mostly occurring downshear left in its southwestern quadrant. Under a favorable environment with moderate convective available potential energy and moderate low‐level VWS, a surface cold pool was found in the west‐southwestern quadrants of Utor triggered by the middle‐lower tropospheric dry air intrusion from inland to the north. Both frontogenesis and quasi‐balanced, ageostrophic Q‐vector diagnostics demonstrate that the quasi‐balanced forcing near the surface cold cool contributed to the enhancement of convection in the west‐southwestern quadrants of Utor. It is concluded that the environmental VWS and the consequent surface cold pool dynamics play an important role in rainfall asymmetry in Utor when it made landfall over the southern coast of South China.
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