【摘要】 利用1980—2015年NCEP/NCAR逐日再分析资料和广西80个地面气象站资料,采用Lamb-Jenkinson方法对广西区域霾过程的大气环流进行分型,并探讨高低空环流型配置与区域霾过程的关系。结果表明:当地面东南风型、高空西风型时,广西出现霾过程的频率最高;地面东风型配合高空西风型对年霾过程的贡献最大,地面东南风型配合高空西风型主要出现在冷暖气流转换的春季、地面低压型配合高空高压脊型出现在西太平洋副热带高压明显加强、地面处于弱低压环境场的夏季、地面东风型配合高空西风型出现在环流稳定平直的秋季、地面东风型配合高空高压脊型出现在环流经向度明显增强的冬季,霾过程具有冬季多发、夏季少发的特点。近36年来,地面东风型配合高空高压脊型是广西霾过程呈偏多趋势的主导环流型。更多还原

【Abstract】 By using the reanalysis grid data from 1980 to 2015 provided by NCEP/NCAR(National Centers for Environmental Prediction),the surface weather data of 80 stations in Guangxi,and the LambJenkinson atmospheric circulation classification method,we analyze the regular patterns of regional haze events and corresponding atmospheric circulation characteristics.The results show that the probability of hazes is the greatest while the circulation is the southeast wind type at the sea-level pressure field and west wind type at 500 hPa.The pattern with the east wind type at sea-level pressure field and the west wind type at 500 hPa makes the maximum contribution to the annual total hazes.The pattern of the southeast wind type at sea level and the west wind type at 500 hPa mainly occurs in spring,the transition period of cold air and warm air.The pattern of the cyclone type at sea level and the anticyclone type at 500 hPa mainly occurs in summer with the significantly strengthened western Pacific High and weak low-pressure on the ground.The pattern of the easterly type at sea level and west wind type at 500 hPa occurs in autumn with stable and straight circulation.The pattern of the easterly wind at sea level and anticyclone type at 500 hPa mainly occurs in winter with significantly increasing meridional circulation.The probability of hazes is the highest in winter,the lowest in summer.In the past 36 years,the haze contribution rate of east wind type at sea level and the anticyclone type at 500 hPa is increasing,which is the dominant circulation pattern for the trend of more-than-normal hazes in the Guangxi.更多还原