The Energy Budget of a Southwest Vortex With Heavy Rainfall over South China |
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| Authors: | FU Shenming SUN Jianhu ZHAO Sixiong LI Wanli |
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| Affiliation: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | ![]()
Energy budgets were analyzed to study the development of an eastwardpropagating southwest vortex (SWV) associated with heavy rainfall oversouthern China (11--13 June 2008). The results show that kinetic energy (KE)generation and advection were the most important KE sources, while frictionand sub-grid processes were the main KE sinks. There was downward conversionfrom divergent to rotational wind KE consistent with the downward stretchingof SWVs. The Coriolis force was important for the formation and maintenanceof the SWV. Convergence was also an important factor for maintenance, as wasvertical motion during the mature stage of the SWV and the formation stageof a newly formed vortex (vortex B). The conversion from available potentialenergy (APE) to KE of divergent wind can lead to strong convection. Verticalmotion influenced APE by dynamical and thermal processes which had oppositeeffects. The variation of APE was related to the heavy rainfall andconvection; in this case, vertical motion with direct thermal circulationwas the most important way in which APE was released, while latent heatrelease and vertical temperature advection were important for APEgeneration. |
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| Keywords: | southwest vortex kinetic energy available potential energy |
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