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
2期
356-370
,共15页
喻自凤%梁旭东%余晖%Johnny C. L. CHAN
喻自鳳%樑旭東%餘暉%Johnny C. L. CHAN
유자봉%량욱동%여휘%Johnny C. L. CHAN
中尺度涡旋%低气压%热带%非绝热加热%案例%光伏效应%雷达图像%观测数据
中呎度渦鏇%低氣壓%熱帶%非絕熱加熱%案例%光伏效應%雷達圖像%觀測數據
중척도와선%저기압%열대%비절열가열%안례%광복효응%뢰체도상%관측수거
mesoscale vortex%tropical depression%heavy rain%potential vorticity
An observational analysis of satellite blackbody temperature （TBB） data and radar images suggests that the mesoscale vortex generation and merging process appeared to be essential for a tropical-depression-related heavy rain event in Shanghai, China. A numerical simulation reproduced the observed mesoscale vortex generation and merging process and the corresponding rain pattern, and then the model outputs were used to study the related dynamics through diagnosing the potential vorticity （PV） equation. The tropical depression （TD） was found to weaken first at lower levels and then at upper levels due to negative horizontal PV advection and diabatic heating effects. The meso-vortices developed gradually, also from the lower to the upper levels, as a result of positive horizontal PV advection and diabatic heating effects in the downshear left quadrant of the TD. One of these newly-generated vortices, V1, replaced the TD ultimately, while the other two, V2 and V3, merged due to the horizontal PV advection process. Together with the redevelopment of V1, the merging of V2 and V3 triggered the very heavy rain in Shanghai.
