2016年11月4日华北地区大范围平流雾过程分析

Analysis of Large-Scale Advection Fog Process in North China on November 4, 2016

摘要: 本文利用空间分辨率为1˚ × 1˚，时间分辨率为6小时的NCEP资料，对2016年11月04日华北地区发生的一次大范围平流雾过程进行分析。结果表明：1) 此次过程中高空为西北或偏西气流，850 hPa为弱暖区偏西或偏南气流控制，地面形势场较弱；2) 本次大雾过程期间近地面层具有逆温结构；3) 近地面层弱辐合上升运动十分有利于逆温层的维持，为雾的维持提供了良好的辐合机制，使得该地区持续保持在高湿状态，对于大雾长时间维持具有重要作用。

Abstract: This article analyzes a large-scale advection fog process that occurred in the North China region on November 4, 2016, using NCEP data with a spatial resolution of 1˚ × 1˚ and a temporal resolution of 6 hours. The results indicate that: 1) During this process, the upper atmosphere was dominated by northwest or westward airflow, and 850 hPa was controlled by weak warm zone westward or southward airflow, resulting in a weaker ground situation field; 2) During this heavy fog process, there was an inversion structure in the near surface layer; 3) The weak convergence and upward movement in the near surface layer is very beneficial for maintaining the inversion layer, providing a good convergence mechanism for maintaining fog and keeping the region in a high humidity state, which plays an important role in the long-term maintenance of heavy fog.