大气科学进展(英文版)
大氣科學進展(英文版)
대기과학진전(영문판)
ADVANCES IN ATMOSPHERIC SCIENCES
2010年
3期
552-561
,共10页
余锦华%谈哲敏%Yuqing WANG
餘錦華%談哲敏%Yuqing WANG
여금화%담철민%Yuqing WANG
垂直风切变%强热带风暴%不对称%降雨量%强度%TRMM卫星%作者%降水分布
垂直風切變%彊熱帶風暴%不對稱%降雨量%彊度%TRMM衛星%作者%降水分佈
수직풍절변%강열대풍폭%불대칭%강우량%강도%TRMM위성%작자%강수분포
vertical wind shear%tropical storm%rainfall distribution
The effects of environmental vertical wind shear (VWS) on the intensity and rainfall asymmetries in Tropical Storm (TS) Bilis (2006) have been analyzed based on TRMM/TMI-estimated surface rainfall data, QuikSCAT wind fields, 850- and 200-hPa winds of the NCEP-NCAR reanalysis, precipitation data at 5-min intervals from automatic weather stations over mainland China, and the best track data of TS Bilis (2006). The results show that the simultaneous and 6-hour-lagged correlation coefficients between VWS and storm intensity (the minimum central sea level pressure) are 0.59145 and 0.57438 (P 〈0.01), respectively. The averaged VWS was found to be about 11 m s-1 and thus suppressed the intensification of Bilis (2006). Distribution of precipitation in Bilis (2006) was highly asymmetric. The azimuthally-averaged rainfall rate in the partial eyewall, however, was smaller than that in a major outer rainband. As the storm intensified, the major rainband showed an unusual outward propagation. The VWS had a great impact on the asymmetric distribution of precipitation. Consistent with previous modeling studies, heavy rainfall generally occurred downshear to downshear-left of the VWS vector both near and outside the eyewall, showing a strong wavenumber-one asymmetry, which was amplified as the VWS increased.