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

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Frontiers of Earth Science 2022年第4期16卷 1052-1060页

作者： Huiyan XU Dengrong ZHANG Zhejiang Provincial Key Laboratory of Urban Wetlands and Regional Change Hangzhou Normal UniversityHangzhou 311121China

The three-dimensional Weather Research and Forecasting(WRF)model was used to conduct sensitivity experiments during the landfall of Typhoon Fitow(2013)to examine the impacts of cloud radiative processes on thermal *** 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 by reducing outgoing *** suppressed radiative cooling reduced from the ice cloud layers to liquid cloud *** was conducive to reducing *** decreased instability was associated with the reduced upward *** reduced upward motion led to a decreased vertical mass ***,heat divergence was weakened to warm the *** with suppressed radiative cooling,these effects jointly suppressed net condensation and ***,the reduced rainfall due to the cloud radiative effects were mainly associated with the reduced convective and stratiform *** reduced convective rainfall was associated with the reduced net condensation,while the reduced stratiform rainfall was related to the constraint of hydrometeor convergence.

关键词： heat budget radiative cooling heat divergence latent heat release typhoon

Potential Vorticity Structure and Inversion of the Cyclogenesis Over the Yangtze River and Huaihe River Valleys

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Advances in Atmospheric Sciences 2007年第1期24卷 44-54页

作者：赵兵科吴国雄姚秀萍 Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030 Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 China Meteorological Administration Training CenterBeijing 100081

In this paper, the potential vorticity structure and inversion of the cyclogenesis over the Yangtze River and Huaihe River valleys during 21 23 June 2003 are investigated with a potential vorticity （PV） framework. The cyclogenesis is manifested by a lower-tropospheric PV anomaly over the Yangtze River and Huaihe River valleys at early stages mainly due to latent heat release, which greatly affects the evolution of the associated lower-tropospheric geopotential height and wind fields as demonstrated by piecewise PV inversion. At later stages, an upper-tropospheric PV anomaly develops, resulting in the growth of ridges over the cyclone in both the upstream and downstream, which provide a favorable background field for the low-level cyclone development. But the effect of a surface thermal anomaly always impedes the development of the cyclone to different extents during this cyclogenesis. It is further demonstrated that the position and the strength of the PV anomaly are closely related to the low-level cyclone development, and the lower-tropospheric PV anomaly seems to constitute the most significant feature, for instance, contributing about 60% to the low-level jet （LLJ）.

关键词： potential vorticity anomaly potential vorticity inversion latent heat release low-level jet,cyclogenesis

ANALYSIS OF THE WESTWARD EXTENSION OF WESTERN PACIFIC SUBTROPICAL HIGH DURING A HEAVY RAIN PERIOD OVER SOUTHERN CHINA IN JUNE 2005

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Journal of Tropical Meteorology 2008年第2期14卷 93-96页

作者：司东徐海明温敏何金海 Department of Atmospheric Sciences Nanjing University of Information Science & Technology State Key Laboratory of severe Weather Chinese Academy of Meteorological Sciences

The NCEP/NCAR II daily mean reanalysis data and observed precipitation data are employed to investigate the westward extension of the western Pacific subtropical high (WPSH) during the heavy rain period over the southern China in June 2005. Results show that there may exist a relationship between the east-west shift of the WPSH and the process of a southern China heavy rain. The analysis indicates that the vertical motion in the WPSH area is mainly caused by the latent heat release of monsoon rain belts on its northern and southern sides. The vertical motion could cause the accumulation of air mass in the center and west of the WPSH, which leads to its strengthening. The appearance of the northern and southern monsoon rain belts could not only enhance the WPSH by strengthening the descending draft, but also excite the development of positive vorticity and restrict the WPSH's movement in the north-south direction. Moreover, the Indian monsoon rainfall to the west of the WPSH may excite the development of anticyclonic vorticity on its eastern side, which leads to the westward extension of the WPSH.

关键词： western pacific subtropical high heavy rain vertical motion latent heat release

The Impact of the Eastward Propagation of Convective Systems over the Tibetan Plateau on the Southwest Vortex Formation in Summer

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Atmospheric and Oceanic Science Letters 2010年第1期3卷 51-57页

作者： FU Shen-Ming SUN Jian-Hua ZHAO Si-Xiong LI Wan-Li Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100084 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Cold andAridRegions Environmental andEngineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

Based on the temperature of the black body (TBB),station observed and NCEP reanalysis data,the impacts of the eastward propagation of convective cloud systems over the Tibetan Plateau on the southwest vortex (SWV) formation that occurred at 1800 UTC on 29 June 2003 are analyzed by using the Zwack-Okossi (Z-O) equation to diagnose the thermal and dynamic *** is found that,in summer,severe convective activities often occur over the Tibetan Plateau due to the abundant supply of *** convective cloud near the east edge of the plateau could move eastward with a shortwave trough in the *** divergent center that is induced by latent heat release,which is associated with severe convective activities,moves out with the convective cloud and contributes to the low level decompression which is favorable for the formation of plateau edge cyclogenesis (PEC).The Z-O equation indicates that,in this case,the latent heat release and convergence are the two most important factors for SWV formation,which amounts to about 42% and 15% of the term TOTAL,*** is implied that the thermal process effect was more important than the dynamic process during SWV formation.

关键词： Tibetan Plateau southwest vortex convective system temperature of the black body latent heat release plateau edge cyclogenesis