一次海风锋触发的强对流天气分析

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Plateau Meteorology
Plateau Meteorology ›› 2010, Vol. 29 ›› Issue (5) : 1261-1269.

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Abstract

Using the automatic meteorological observation data and Doppler radar data, a wide severe convective weather rarely happened in Jiangsu Province on June 5, 2009 is compositely analyzed. And the development process of the sea breeze front was simulated by the WRFV3 model. The results show that the sea breeze front caused thetransfigurationfrontogenesis due to the ground irregular heating and the temperature and humiditydifferences betweenthe land and sea triggered and strengthen the severe convective weather. The convective cloud begin to develop according to the convergence when it enters into the front area, and spreads to the front along the average wind. Due to the forced by the east airflow, the moving path of sea breeze front departed from the main echo, some convective cells were triggered and the new MCS were organized at its back in the process of the sea breeze front moving. The simulated results show that the sea breeze front has important effect on triggering and intensifying the convective process, the convective cells develop strong, the convergencein the low level and vertical velocity inside the convective cells obviously enhanced when it move near the sea breeze front. In addition, under the helpful temperature and humidity conditions, the thunderstorm outflow can strengthen updraft.

Key words

Severe convection / Sea breeze front / Dynamical structure / Trigger mechanism

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