Evolutional Characteristics of Electric Field in a Mesoscale Convective System
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Abstract:
Combining the radar, satellite, lightning positioning system data, etc, the characteristics and evolution of cloudtoground lightning and the electric field of the Mesoscale Convective System (MCS) in Nanjing on 5 June 2009 are analyzed. Positive cloudtoground lightning played a dominant role in the developing stage of MCS; negative cloudtoground flashes are dominant in the mature stage; positive flashes are relatively frequent over the stratiform cloud areas in the extinction stage. This process of the electric field evolution can be divided into four stages, and the evolution and characteristics of the electric field in convective areas are analyzed. The electric field of MCS over the convective area is simulated with the quasinormal distribution model. It is found that the simulated electric field accords with observation, and the quasinormal distribution model can response to slight changes in the electric field.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.