热带气象学报2017，Vol.33Issue(3)：375-385,11.DOI:10.16032/j.issn.1004-4965.2017.03.009
两个不同季节台风引发广西特大暴雨的水汽和螺旋度对比分析
COMPARATIVE ANALYSIS OF MOISTURE AND HELICITY DURING EXTRAORDINARY STORMS CAUSED BY TWO TYPHOONS IN DIFFERENT SEASONS
摘要
Abstract
By using the dataset of CM A-STI Tropical Cyclone Optimal Tracks,the NCEP/NCAR reanalysis data,Guangxi regional automatic weather stations observation data and precipitation data provided by China Meteorological Data Sharing Service,typhoons Haiyan(1330) and Ramasun(1409),which caused extraordinary rainstorms in Guangxi,were analyzed.The results showed that the cold air effect was obvious on the late-autumn typhoon Haiyan,while the summer typhoon Ramasun was influenced by the southwest monsoon.Due to the southwest monsoon,the transfer of water vapor was stronger with Ramasun,which affected Guangxi,than with Haiyan,and the water vapor transfer of Haiyan was totally dependent on its circulation.On the contrary,in terms of dynamic conditions,Haiyan was stronger than Ramasun,its maximum value of the helicity center was also greater,and its moisture convergence layers were thicker over Guangxi.The rains beginning in the eastern boundary of Guangxi started to decrease after reaching the maximum input,and the transfer of water vapor from output transformed into input and began to increase suddenly,while the strongest periods of rainfall occurred around the time when the water vapor input of the southern boundary peaked.The positive helicity center had good corresponding relationship with the heavy rainfall area and were at least six hours in advance,so that the helicity can be used as an important reference factor in forecasting torrential rain caused by typhoons.关键词
特大暴雨/冷空气/西南季风/水汽输送/水汽收支/相对风暴螺旋度Key words
extraordinary storm/cold air/southwest monsoon/transfer of water vapor/moisture budget/helicity分类
天文与地球科学引用本文复制引用
卢小丹,王黎娟,刘国忠,姚学民..两个不同季节台风引发广西特大暴雨的水汽和螺旋度对比分析[J].热带气象学报,2017,33(3):375-385,11.基金项目
中国气象局华南区域气象中心科技攻关项目(GRMC2014M13) （GRMC2014M13）
广西自然科学基金项目(2014GXNSFAA118299)共同资助 （2014GXNSFAA118299）
