渤海一次后倾槽强对流天气的成因分析

The Cause Analysis About a Strong Convective Weather of Backward-tilting Trough in Bohai Sea

基于NECP再分析资料,使用WRF模式、海浪模型对2015年8月3日渤海地区强对流天气过程进行数值模拟。指出主要成因为:中低层大尺度辐合抬升与高层强辐散呈垂直耦合状态,有利于强上升运动的发展;低空急流的增温增湿进一步加大了高低空的温湿差;海面中尺度低压辐合系统是触发机制;海表温度较高海域的海气湍流输送为强对流的发生提供了边界层的热力和水汽条件。

Based on the NECP reanalysis data, a strong convective weather process on August 3, 2015 in Bohai sea was simulated and analyzed by WRF model of marine meteorological numerical prediction and wave model. The main causes include： the large-scale convergence uplift in middle-low level and strong divergence at the upper level are in a state of vertical coupling, promoting the development of strong upward movement; the wanning and humidifying function of lower level jet further increase the gap between high and low air of temperature and humidity; the surface mesoscale low pressure system is the trigger mechanism of the strong convection; the place where the sea surface temperature is higher, because of air-sea turbulence, the lower atmosphere gets a lots of warm and moist air and provides the heat and water vapor of boundary layer for the occurrence of strong convection.