摘要
基于常规气象观测资料和PM_(2.5)浓度资料,分析了2019年1月10—14日天津市东丽区出现的一次持续性雾霾天气特征及其成因。结果表明:此次雾霾天气具有明显的阶段性特征,高空平直西风环流、中层暖脊和地面弱气压场为此次雾霾天气出现提供了有利的天气形势。轻雾和霾阶段,能见度变化更易受到相对湿度的影响;而雾阶段,能见度变化更易受到风速的影响。PM_(2.5)浓度与地面气象因子关系密切,与能见度、风速负相关,与相对湿度正相关。当其他气象条件稳定,且周边地区污染物浓度较高时,近地面风向转变,对本地区雾霾的出现起到关键性作用。
Based on conventional meteorological observation data and PM_(2.5) concentration data,the characteristics and causes of persistent fog and haze weather occurring from January 10 to 14,2019,in Dongli District of Tianjin were analyzed.The results show that the fog and haze weather has obvious phase characteristics.The general circulation,including upper-level straight stable westerly circulation,middle-level warm ridge,and weakened surface pressure,provides favorable synoptic conditions for the fog and haze weather.Visibility is more susceptible to relative humidity during light fog and haze stages,while at the fog stage,it is more susceptible to wind speed.PM_(2.5) concentration and surface meteorological elements are closely related.PM_(2.5) concentration is negatively correlated with visibility and wind speed and positively correlated with relative humidity.When other meteorological conditions are stable and the concentration of pollutants is high in the surrounding areas,the change of wind direction near the ground plays a key role in the occurrence of fog and haze in this region.
作者
史珺
赵玉洁
SHI Jun;ZHAO Yu-jie(Meteorological Service in Dongli District of Tianjin,Tianjin 300300,China)
出处
《气象与环境学报》
2021年第5期8-12,共5页
Journal of Meteorology and Environment
基金
天津市科技兴海项目(KJXH2013-18)资助。
关键词
雾霾天气
阶段性特征
能见度
Fog and haze weather
Phase characteristics
Visibility
