南宁浓雾的天气形势及边界层特征  

Synoptic Situation and Boundary Layer Features of Dense Fog in Nanning

作　　者：李渝平 黄莉 白龙 Li Yuping;Huang Li;Bai Long(Nanning Meteorological Bureau,Nanning 530022,China)

机构地区：[1]南宁市气象局,广西南宁530022

出　　处：《防灾科技学院学报》2018年第1期82-88,共7页Journal of Institute of Disaster Prevention

基　　金：广西气象局重点项目(桂气科201302);南宁市科技局项目(20153257);南宁市气象局科研与技术开发项目(南气科201601)

摘　　要：利用常规观测资料及NCEP的FNL 1°×1°再分析资料,对2001—2015年南宁市能见度不足200m的浓雾天气的形成机理及边界层特征开展研究。研究结果表明:南宁市浓雾天气的形成背景可分为纬向西风波动型、槽后西北气流型、槽前西南气流型、副热带高压后部回流型等4种类型;平流浓雾发生时地面出现弱辐合线,可分为锋前暖区型和南风辐合型;辐射浓雾发生时地面受冷高压脊或者均压场控制;边界层特征主要表现在1000~925h Pa气层,按其特征可分为逆温型、等温型和湿层型。Based on conventionally observational data and NCEP 1°x 1°reanalysis data(FNL),we study the forming mechanism and boundary layer characteristics of dense fog with a less than 200 m visibility in Nanning from 2001 to 2015.As the results show,there are 4 types of 500 hPa circulation,which are the zonal westerlies waves'type,the northwest air flow in the rear of trough type,the southwest air flow in front of the trough type,the backflow in the bottom to the rear of subtropical anticyclone type respectively.The weak surface convergence line occurs during the advection dense fog,which is categorized into the forefront warm zone pattern and southerly wind velocity convergence pattern.When radiation dense fog occurs,cold high pressure ridge or uniform pressure occupies the area.The boundary layer characteristics mainly appear at the level of 1000-925 hPa,which are classified into temperature inversion type,isothermal type,and humid layer type.

关 键 词：南宁 浓雾 天气形势 地面气压场 边界层 

分 类 号：P426.41[天文地球—大气科学及气象学]