贵州山区一次锋面雾的数值模拟及形成条件诊断分析

利用中尺度模式系统WRF对2008-02-20—21贵州山区出现的一次锋面大雾进行了数值模拟研究,模拟大雾出现的区域与实况比较一致。利用数值模拟的高分辨率产品对锋面雾的形成条件进行了分析,结果表明:WRF模式对此次大雾的发生区域以及生成过程具有较好的数值模拟能力;贵州处在南支槽前西南气流控制下,中低层偏南气流强盛,为大雾的发生提供了有利的背景;静止锋的稳定维持和贴地逆温层的存在是雾发生的关键因素。

Numerical Simulation of a Front Fog in Guizhou and Diagnostic Analysis of Formation Condition

Based on NCEP data the front fog occurring in Guizhou between 20th -21st, Feb. ,2008 was simulated by using mesoscale model WRF. Formation conditions of frontal fog were analyzed by using numerical products. Results show that the location and formation of the simulated frontal fog are in accordance with the real situation. Guizhou is under of southwest air current before southern trough and the south airflow is intensive, which is provide with favorable background for fog occurring. The stable maintenance of stationary front and near - surface inversion layer are key factors of fog occurring.