气象2016，Vol.42Issue(3)：305-313,9.DOI:10.7519/j.issn.1000-0526.2016.3.005
“灿鸿”台风造成浙江东北部大暴雨成因分析
Analysis on Causes for the Severe Rainfall in Northeastern Zhejiang Induced by Typhoon Chan-Hom (1509)
摘要
Abstract
This paper analyzes the cause of the extremely heavy rainfall in northeastern Zhejiang induced by Typhoon Chan-Hom (1509)from 10 to 11 July 2015 by using conventional observation,AWS data,satel-lite and NECP reanalysis data.The results show that under the effect of the special terrain in northeast of Zhejiang,strong intensity and wild impaction of Chan-Hom meeting with the long-time northeast airflow contributed for this heavy rain process.During the early stage of the Chan-Hom impact,this area was in a state of convective instability.Besides,the abundant water vapor,low-level convergence and upper-level divergence provided a beneficial condition for the heavy rainfall.In the rainstorm areas,the MPV1 changed from negative to positive at low level,leading to an increase of vertical vorticity.The long-time mainte-nance of the highθse energy region at 925 hPa also benefited the updraft.The long-time transportation of water vapor was not only favorable for Chan-Hom’s maintenance,but also beneficial to the formation of the heavy rainfall.There was a positive correlation of 6-12 h in advance for the increasing and decreasing of the heavy rainfall with the vapor transportation,surface convergence zone andθse at 925 hPa.And the special topography enhanced the heavy rainfall supported by the northeast airflow because of the effects of the upslope and terrain convergence,which were formed by the trumpet-shaped terrain of Hangzhou Bay, Siming Mountain,elongated northeast-southwest Xiangshan Harbor and its southern mountains.关键词
台风灿鸿/大暴雨/对流不稳定/东北气流/地形Key words
Typhoon Chan-Hom/extremely heavy rainfall/convective instability/northeast airflow/to-pography分类
天文与地球科学引用本文复制引用
周福,钱燕珍,方艳莹,顾小丽,王毅..“灿鸿”台风造成浙江东北部大暴雨成因分析[J].气象,2016,42(3):305-313,9.基金项目
中国气象局气象关键技术集成与应用项目（CMAGJ2013M21）和宁波市科技局项目（2014C50024）共同资助 （）
