乌鲁木齐一次重污染过程及其边界层特征分析  

Boundary Layer Characteristics of a Continuous Heavy Pollution in Urumqi

作　　者：黄秋霞 赵克明 艾克代·沙拉木 柳宏英 叶尔克江·霍依哈孜 HUANG Qiuxia;ZHAO Keming;Aikedai Salamu;LIU Hongying;Erkejiang Hoyhazi(Changji Meteorological Bureau,Changji 831100,China;Xinjiang Meteorological Observatory,Urumqi 830002,China;Meteorological Bureau of Kizilsu Kirgiz Autonomous Prefecture,Artux 845350,China)

机构地区：[1]昌吉州气象局,新疆昌吉831100 [2]新疆气象台,新疆乌鲁木齐830002 [3]克州气象局,新疆阿图什845350

出　　处：《沙漠与绿洲气象》2023年第3期93-98,共6页Desert and Oasis Meteorology

基　　金：新疆维吾尔自治区自然基金面上项目(2020D01A99);昌吉回族自治州科技项目(2020S03);新疆气象局中亚大气科学研究基金(CASS201719)。

摘　　要：针对2020年1月5—17日乌鲁木齐出现的重污染天气,利用乌鲁木齐的探空站资料和地面常规气象数据计算了最大混合层高度、平均风速、逆温特性、边界层通风量、能见度、相对湿度等,对最大混合层高度、能见度、相对湿度与PM2.5质量浓度进行了相关性分析,并利用Hysplit后向气团轨迹模式分析污染形成源。结果表明:此次重污染天气过程大气层结较为稳定,主要表现为逆温层厚(平均577 m)、逆温强度大(平均1.7℃/100 m)、最大混合层高度低(平均400 m);边界层通风量对局地空气质量影响显著;PM2.5质量浓度与相对湿度呈弱的正相关,与能见度呈指数相关;Hysplit后向气团轨迹模式分析得出此次污染过程以局地排放为主要形成源。In view of the heavy pollution weather in Urumqi from January 5 to 17,2020,the maximum mixing layer height,average wind speed,inversion characteristics,boundary layer ventilation volume,visibility and relative humidity were calculated by using the sounding station and ground conventional data of Urumqi,and the correlation between the maximum mixing layer height,visibility,relative humidity and PM_(2.5)concentration were analyzed.The source of pollution was analyzed by Hysplit model.The results showed that the atmospheric stratification was relatively stable in this heavy pollution weather process,and the main causes of heavy pollution were the thickness of inversion layer(average577 m),high intensity(average 1.7℃/100 m)and low mixed layer height(average 400 m).The influence of boundary layer ventilation on local air quality was significant.PM_(2.5)concentration had a weak positive correlation with relative humidity and an exponential correlation with visibility.The analysis of Hysplit model showed that local emission was the main source of the pollution process.

关 键 词：最大混合层高度 边界层通风量 相对湿度 能见度 后向气团轨迹模式 

分 类 号：P458.11[天文地球—大气科学及气象学]