The Energy Budget of a Southwest Vortex With Heavy Rainfall over South China |
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| Authors: | FU Shenming SUN Jianhu ZHAO Sixiong and LI Wanli |
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| Institution: | 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 eastward
propagating southwest vortex (SWV) associated with heavy rainfall over
southern China (11--13 June 2008). The results show that kinetic energy (KE)
generation and advection were the most important KE sources, while friction
and sub-grid processes were the main KE sinks. There was downward conversion
from divergent to rotational wind KE consistent with the downward stretching
of SWVs. The Coriolis force was important for the formation and maintenance
of the SWV. Convergence was also an important factor for maintenance, as was
vertical motion during the mature stage of the SWV and the formation stage
of a newly formed vortex (vortex B). The conversion from available potential
energy (APE) to KE of divergent wind can lead to strong convection. Vertical
motion influenced APE by dynamical and thermal processes which had opposite
effects. The variation of APE was related to the heavy rainfall and
convection; in this case, vertical motion with direct thermal circulation
was the most important way in which APE was released, while latent heat
release and vertical temperature advection were important for APE
generation. |
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| Keywords: | southwest vortex kinetic energy available potential energy |
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