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气象:2019,45(10):1402-1414
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南海台风苗柏对一次梅雨暴雨加强影响的模拟试验
陈有利,钱燕珍,段晶晶,徐迪峰,郭建民
(宁波市气象台,宁波 315012)
Numerical Simulation of Typhoon Merbok Effect on Rainstorm During Meiyu Period
CHEN Youli,QIAN Yanzhen,DUAN Jingjing,XU Difeng,GUO Jianmin
(Ningbo Meteorological Observatory, Ningbo 315012)
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投稿时间:2018-01-26    修订日期:2019-05-10
中文摘要: 利用云图资料、再分析资料和自动站加密资料对2017年6月13日前后浙江梅雨暴雨的成因进行分析,发现此次暴雨过程与低层偏东风和西南气流带来充沛的水汽和能量有很大关系,而1702号台风苗柏对西南气流的输送有重要作用。为了验证“苗柏”的作用,使用WRF模式对此次过程进行了模拟试验,并做了“苗柏”强度增强一倍、强度减弱一半、去掉“苗柏”的敏感性试验,结果表明:“苗柏”及其登陆减弱后的残留云系,有利于偏南风的维持和加强,使得冷暖空气在浙江汇合,南北风交汇处梯度增大,辐合加强。“苗柏”的存在增强了西南急流水汽输送,西南急流的左侧伴随有散度辐合中心,而在高空急流的右侧有散度的辐散,有利于垂直运动的发生,是强降水产生的主要原因。敏感性试验表明台风强度越强,西南暖湿气流输送越明显,辐合越强,越有利于垂直运动发展,对流发展更旺盛,降水也更强。
Abstract:Based on the dense observation data, satellite images and reanalysis data, the reasons of Meiyu heavy rainfall in Zhejiang on 13 June 2017 are analyzed. The results show that low-level easterly and southwest winds could bring significant water vapor and energy, and Typhoon Merbok had an important role on the southwest air transport. The non-hydrostatic WRF V3.6.1 model was used to simulate heavy rainfall at high resolution with two nests. The sensitivity experiments show that Typhoon Merbok can enhanced south wind transport to Zhejiang, making the northeastern and southeastern flows meet in Zhejiang. The gradient of the north and south winds increased obviously, which made convergence streng-thened obviously. Meantime, “Merbok” enhanced the water vapor transport. A convergence in the left side of the mid-low-level southwest wind was accompanied by a divergence on the right side of the upper-level jet. This was conducive to the occurrence of vertical motion, promoting the increase of rainstorm. Sensitivity experiments show that the stronger the typhoon, the more water vapor transport in southwest flow, the stronger convergence, the more conducive to the development of vertical motion and convection, and the heavier the precipitation.
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基金项目:宁波市科技局项目(2014C50024和2015F1020)、浙江省预报员专项项目(2017YBY03)、宁波市气象局青年项目(NBQX2017002C)和宁波市自然科学基金项目(2018A610210)共同资助
引用文本:
陈有利,钱燕珍,段晶晶,徐迪峰,郭建民,2019.南海台风苗柏对一次梅雨暴雨加强影响的模拟试验[J].气象,45(10):1402-1414.
CHEN Youli,QIAN Yanzhen,DUAN Jingjing,XU Difeng,GUO Jianmin,2019.Numerical Simulation of Typhoon Merbok Effect on Rainstorm During Meiyu Period[J].Meteor Mon,45(10):1402-1414.