海温对0907号热带气旋“天鹅”入海后强度变化影响的数值模拟研究  

NUMERICAL STUDY ON THE EFFECT OF SEA SURFACE TEMPERATURE ON INTENSITY CHANGE IN TROPICAL CYCLONE GONI(0907) RE-ENTERING THE SEA

作　　者：陈国民[1] 曾智华[1] 曹庆 

机构地区：[1]中国气象局上海台风研究所/中国气象局台风预报技术开放实验室,上海200030 [2]上海海洋气象台,上海201300

出　　处：《热带气象学报》2013年第6期984-992,共9页Journal of Tropical Meteorology

基　　金：国家973项目(2009CB421504);国家自然科学基金项目(40875039;40921160381;40730948;41275067)共同资助

摘　　要：运用WRF模式对0907号热带气旋"天鹅"进行84 h过程的数值模拟,研究海温的变化对"天鹅"登陆入海后强度变化的影响。结果表明,模式较好重现了"天鹅"再次进入南海后复杂曲折的移动路径及强度再度增强的过程;"天鹅"再次入海后强度变化对海温非常敏感,而路径对海温并不敏感,北部湾较高的海温是造成"天鹅"入海后再增强的重要原因之一;在模式中提高(降低)海温时,使"天鹅"入海后中心西南侧的低层热量通量增强(减弱),表面风速随之加强(减弱),边界层入流和垂直上升运动相应增强(减弱),进而促进(抑制)整个气旋中心附近(特别是中心西南侧)对流发展,最后导致"天鹅"入海后强度的再增强。The impacts of different sea surface temperature （SST） on intensity change in tropical cyclone Goni （0907） are investigated using 84-hour WRF model simulation. Results show that the 4-km WRF model reproduces reasonably well the erratic track and reintensification of Goni when it enters Beibu Gulf. Goni＇s intensity is very sensitive to the SST but the track is not when it enters sea, and the high SST of Beibu Gulf is one of the key factors for Goni＇s reintensification. After increasing （reducing） the model＇s SST, the low-level heat flux will enhance （weaken） in the southwest of the center, the surface wind speed will also strengthen （decrease） with it. As a result, the boundary-layer inflow and ascending movement will intensify （reduce）, promoting （restraining） the convection near the TC center （especially at southwest）, finally resulting in the reintensification when Goni re-enters the sea.

关 键 词：天气学 “天鹅” 入海再增强 数值模拟 海温 

分 类 号：P444[天文地球—大气科学及气象学]