A STUDY ON THE APPLICATION OF FY-2E CLOUD DRIFT WIND HEIGHT REASSIGNMENT IN NUMERICAL FORECAST OF TYPHOON CHANTHU(1003) TRACK  

作　　者：李昊睿 丁伟钰 薛纪善 陈子通 高郁东 

机构地区：[1]Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,CMA [2]Chinese Academy of Meteorological Sciences

出　　处：《Journal of Tropical Meteorology》2015年第1期34-42,共9页热带气象学报（英文版）

基　　金：Specialized Science Project for Public Welfare Industries(Metrological Sector)(GYHY201206010,GYHY201406009);Science and Technology Planning Project for Guangdong Province(2012A061400012);Program for the 12th Five-Year Economic Development(2012BAC22B00);Natural Science Foundation of China(41075083);Program for Integration and Application of Key Meteorological Techniques from CMA(CMAGJ2012M36);Project from Guangdong Meteorological Bureau(2013A04)

摘　　要：In this paper, we first analyzed cloud drift wind(CDW) data distribution in the vertical direction, and then reassigned the height of every CDW in the research domain in terms of background information, and finally, conducted contrast numerical experiments of assimilating the CDW data before and after reassignment to examine the impacts on the forecast of the track of Typhoon Chanthu(1003) from 00:00(Coordinated Universal Time) 21 July to 00:00 UTC23 July, 2010. The analysis results of the CDW data indicate that the number of CDWs is mainly distributed in the midand upper-troposphere above 500 h Pa, with the maximum number at about 300 h Pa. The height reassigning method mentioned in this work may update the height effectively, and the CDW data are distributed reasonably and no obvious contradiction occurs in the horizontal direction after height reassignment. After assimilating the height-reassigned CDW data, especially the water vapor CDW data, the initial wind field around Typhoon Chanthu(1003) became more reasonable, and then the steering current leading the typhoon to move to the correct location became stronger. As a result, the numerical track predictions are improved.In this paper, we first analyzed cloud drift wind（CDW） data distribution in the vertical direction, and then reassigned the height of every CDW in the research domain in terms of background information, and finally, conducted contrast numerical experiments of assimilating the CDW data before and after reassignment to examine the impacts on the forecast of the track of Typhoon Chanthu（1003） from 00：00（Coordinated Universal Time） 21 July to 00：00 UTC23 July, 2010. The analysis results of the CDW data indicate that the number of CDWs is mainly distributed in the midand upper-troposphere above 500 h Pa, with the maximum number at about 300 h Pa. The height reassigning method mentioned in this work may update the height effectively, and the CDW data are distributed reasonably and no obvious contradiction occurs in the horizontal direction after height reassignment. After assimilating the height-reassigned CDW data, especially the water vapor CDW data, the initial wind field around Typhoon Chanthu（1003） became more reasonable, and then the steering current leading the typhoon to move to the correct location became stronger. As a result, the numerical track predictions are improved.

关 键 词：height reassignment cloud drift wind variational assimilation typhoon track GRAPES 

分 类 号：P456.7[天文地球—大气科学及气象学]