闽赣地区一次区域性浓雾过程特征和成因分析  

Characteristics and Causes of A Regional Dense Fog in Fujian-Jiangxi Regions

作　　者：宗晨 李睿 林智琛 李长顺 李玲 Zong Chen;Li Rui;Lin Zhichen;Li Changshun;Li Ling(Fujian Meteorological Service Center,Fuzhou 350008,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Fujian Atmospheric Detection Technology Support Center,Fuzhou 350008,China)

机构地区：[1]福建省气象服务中心,福建福州350008 [2]福建省农林大学,福建福州350002 [3]福建省大气探测技术保障中心,福建福州350008

出　　处：《气象与减灾研究》2024年第4期253-261,共9页Meteorology and Disaster Reduction Research

基　　金：福建省气象局开放式研究基金项目(编号:2020KX06);福建省气象局业务类科研专项项目(编号:2023Y01);福建省气象局开放式研究基金项目(编号:2022KJ02).

摘　　要：利用地面气象观测资料、L波段探空资料和NCEP再分析资料,对2019年4月6日闽赣地区一次区域性浓雾天气过程的大尺度环流背景、边界层温湿特征及形成维持机制进行分析。结果表明:闽赣地区高空纬向气流与低层西南偏西暖湿气流叠加,配合地面弱高压均压场,共同构成了此次区域性浓雾过程的有利环流条件。雾区上空较强的双层逆温,不仅为浓雾形成和维持提供了稳定的大气层结,还促进了近地层水汽的持续积累。低层暖平流与贴地层弱冷平流的垂直配置,叠加夜间辐射降温作用,是浓雾形成的关键热力因素;同时,中低层稳定的下沉气流进一步维持了双层逆温结构。低层西南偏西暖湿气流的水汽输送为此次浓雾的形成和维持提供了充足的水汽来源。Based on the ground meteorological observation data,L-band sounding data,and NCEP reanalysis data,the atmospheric circulation background,boundary layer characteristics and the formation and maintenance mechanism of a regional mountainous dense fog event on 6 April 2019 in Fujian-Jiangxi Province were analyzed.The results show that high-altitude zonal airflow,combined with low-altitude warm and humid airflow from the southwest to west in the Fujian-Jiangxi region,was mutually configured with the weak high-pressure equalizing field on the ground,establishing stable atmospheric circulation background conditions favorable for mountainous dense fog.During the dense fog event,a strong double-layer inversion over the affected area created stable atmospheric stratification,facilitating fog formation and maintenance.At the same time,this was also one of the important reasons why water vapor could continuously converge in the near-surface layer.The interaction of warm advection in the lower atmosphere with weak cold advection near the surface,along with nocturnal radiative cooling,provided essential thermal conditions for dense fog formation.Additionally,the combined influence of stable sinking airflow at mid-to-low levels played a crucial role in the formation and maintenance of the double-layer inversion.The transport of water vapor in the low-altitude southwest-to-west warm and humid airflow contributed to favorable moisture conditions for the formation and maintenance of this dense fog event.

关 键 词：浓雾 闽赣地区 成因分析 逆温层 大气环流背景 

分 类 号：P426.41[天文地球—大气科学及气象学]