Impacts of cloud radiative processes on the convective and stratiform rainfall associated with Typhoon Fitow (2013)

分类： 地球科学 >> 大气科学 提交时间： 2022-03-02

徐慧燕

摘要： The three-dimensional Weather Research and Forecasting (WRF) model is used to conduct sensitivity experiments during the landfall?of Typhoon Fitow (2013) to examine the impacts of cloud radiative processes on thermal balance. The vertical profiles of heat budgets, vertical velocity?and stability were?analyzed?to examine the physical processes responsible?for cloud radiative effects on?surface rainfall?for Typhoon Fitow (2013). The inclusion?of clouds reduced radiative cooling?in ice and liquid cloud layers via reducing outgoing radiation. The suppressed radiative cooling?reduces from ice cloud layers to liquid cloud layers. This was conducive to enhancing instability.?The decreased?instability was associated with the reduced?upward motions. The reduced upward motion led to?the decreased vertical mass convergence.?As a result, heat divergence was weakened to warm the atmosphere, this effects and the suppressed radiative cooling jointly?suppressed?net condensation and rainfall.?Furthermore, the reduced rainfall due to the cloud radiative effects was mainly associated with the reduced convective and stratiform rainfall. The reduced convective rainfall was associated with the reduced net condensation, whilst the reduced?stratiform rainfall was related to the constraint hydrometeor convergence.

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