白云机场一次大雾伴雷暴天气数值模拟  

Numerical Simulation of a Heavy Fog Event along with Thunderstorm in Baiyun Airport

作　　者：吴风波 李岩松 

机构地区：[1]民航中南空中交通管理局气象中心,广州510406

出　　处：《气象科技》2016年第2期297-304,共8页Meteorological Science and Technology

摘　　要：2014年3月12日广州白云机场出现了一次持续性大雾伴雷暴天气,本文利用常规资料和WRF模式进行综合分析。研究表明,低层偏南暖湿气流为大雾形成提供了充足的水汽和有利的风场条件,近地面充足的水汽、逆温层的稳定存在是本次大雾过程长时间维持的主要原因。伴随冷锋南下的偏北风使得逆温层、大气饱和状态破坏,是持续性大雾消散的动力因子。WRF模式模拟的地面水汽含量的空间分布、逐小时高度-时间序列图,对大雾生成、维持和消散的预警预报具有一定的参考性。此次雷暴发生在高空槽、切变线和地面锋面相配合的环流形势下,850hPa切变线配合地面锋面共同抬升触发雷暴。A continuous heavy fog event along with a thunderstorm process in Guangzhou Baiyun Airport on 12 March 2014 is investigated by using the conventional observation data and WRF model simulation. The results show that the low-level southerly warm and wet flow provided sufficient moisture and wind conditions for the formation of this fog process; the sufficient moisture and the long-time inversion on the near surface layer were the main causes for the durative heavy fog. The inversion and the atmospheric saturation state were destroyed by the north wind moving down along with the cold front, which was the dynamic factor of the heavy fog disperses. The spatial distribution and hourly height-time sequence diagram of water vapor content simulated by WRF can be used as references for forecasting the formation, maintenance, and dissipation of heavy fogs. The thunderstorm occurred under the background of high trough, shear line, and surface front, which was triggered by the combined action of 850 hPa shear line and the surface front.

关 键 词：广州白云机场 WRF模拟 大雾 雷暴 水汽含量 

分 类 号：P426.4[天文地球—大气科学及气象学]