Translated Titles

Effects of Condensation Heating and Surface Fluxes on the Development of a South China Mesoscale Convective System (MCS)


蒙偉光(Wei-Guang Meng);李江南(Jiang-Nan Li);王安宇(An-Yu Wang);馮瑞權(Soi-Kun Fong);古志明(Chi-Meng Ku);閆敬華(Jing-Hya Yan)

Key Words

凝結加熱 ; 地表通量 ; 中尺度對流系統MCS ; 華南暴雨 ; 數值模擬 ; condensation heating ; surface fluxes ; mesoscale convective system MCS ; South China heavy rainfall ; numerical simulation



Volume or Term/Year and Month of Publication

21卷4期(2005 / 08 / 01)

Page #

368 - 376

Content Language


Chinese Abstract


English Abstract

A sensitive numerical simulation study is carried out to investigate the effects of condensation heating and surface fluxes on the development of a South China MCS that occurred during 23~24 May 1998. Results reveal that: (1) Condensation heating plays an important role in the development of MCS. In every different stage, without condensation heating, MCS precipitation is significantly reduced, and quickly dissipates; (2) Condensation heating demonstrates most importantly during the early development stages of MCS vortex, as the vortex develops stronger, the condensation heating effects reduces; (3) By affecting the MCS development processes, condensation heating also influences the formation of MCS mesoscale environment structure features such as low-level jet (mLLJ), upper-level divergence; (4) By changing the antecedent environmental circulation, the surface fluxes also play an important role in the development of MCS. Because of the surface heating, pressure declines over the heavy rainfall and MCS happening regions, which results in the intensification of southerly flows from the ocean along the South China coastline areas, and leads to the enhancement of horizontal convergence and increase of vapor amount in the lower layer. All these make the atmosphere becoming more unstable and more favorable for the convection.

Topic Category 基礎與應用科學 > 大氣科學