气象2017，Vol.43Issue(6)：686-695,10.DOI:10.7519/j.issn.1000-0526.2017.06.005
台风灿鸿造成浙江东北部大暴雨地形作用的数值模拟研究
Numerical Simulation of Topographic Effect on Heavy Rainfall in Northeastern Zhejiang Caused by Typhoon Chan-Hom
摘要
Abstract
In this article,the non-hydrostatic WRF V3 .6 .1 (Weather Research and Forecast)model is used to simulate Typhoon Chan-Hom at high resolution with three nests.The model can well simulate the de-velopment and evolution of Typhoon Chan-Hom as well as the precipitation that it brought to the northeast of Zhejiang.Observation data indicate that the topographic friction convergence and lifting under northeast air flow make the strong convective systems gather in the northwest of the typhoon eye in the vicinity of Zhejiang,with a lot of convective cloud cluster in the convective systems.This is an important reason for the record-breaking rainfall in northeastern Zhejiang.The control simulation also captures these features. The precipitation system is consistent with orientation of topography,i.e.the rainfall increases on the windward side.The sensitivity experiments show that topography in the northeast area of Zhejiang plays an important role in the increment of the typhoon rainfall.By lowering the terrain,the small-scale convec-tive systems get reduced apparently.Meanwhile,the rainfall in northeastern Zhejiang weakens obviouslyas well.Thus,topography can impact the structure and evolution of these convective systems,causing the abnormal changes of precipitation.Of more importance is that Typhoon Chan-Hom maintained the highly symmetric structure in the vicinity of Zhejiang,with the typical eyewall and warm core structure.关键词
台风/对流系统/地形/轴对称切向风Key words
typhoon/convective system/topography/axial symmetry tangential wind分类
天文与地球科学引用本文复制引用
段晶晶,钱燕珍,周福,方艳莹,郭建民..台风灿鸿造成浙江东北部大暴雨地形作用的数值模拟研究[J].气象,2017,43(6):686-695,10.基金项目
宁波市自然科学基金项目(2016A610208)、宁波市科技局项目(2014C50024)和国家自然科学基金项目(41405051)共同资助 （2016A610208）
