成都市PM2.5污染特征及其与地面气象要素的关系分析  

Characteristics of PM2.5 and Its Relationship with Ground Meteorological Elements in Chengdu

作　　者：曹杨 王晨曦 赵晓莉 刘炜桦 CAO Yang;WANG Chenxi;ZHAO Xiaoli;LIU Weihua(Sichuan Meteorological Disasters Prevention Technology Center,Chengdu 610072,China;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China)

机构地区：[1]四川省气象灾害防御技术中心,四川成都610072 [2]高原与盆地暴雨旱涝灾害四川省重点实验室,四川成都610072

出　　处：《中低纬山地气象》2020年第4期59-64,共6页Mid-low Latitude Mountain Meteorology

基　　金：高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJQN2019021):基于神经网络的空气质量预报优化方法研究。

摘　　要：为了解成都市PM 2.5污染特征及其与地面气象要素的关系,利用环境空气质量监测资料和地面气象观测资料,分析了PM 2.5质量浓度的季节、月和日变化特征,并分不同空气质量等级分析空气质量与地面气象要素的关系。结果表明:PM 2.5质量浓度具有明显的季节、月和日变化特征,且成都市区6个监测站的变化趋势比较一致;成都市相对湿度较大,地面风速较小,约62%的样本分布在相对湿度80%~100%,约85%的样本分布在地面风速0~2 m·s-1,地面风速对成都市PM 2.5的水平输送、扩散、稀释不利;降水对PM 2.5的清除量随PM 2.5初始浓度、降雨持续时间和累积降雨量增加而增大。The air-quality data and ground meteorological data were adopted to analyze the pollution characteristics of PM 2.5 in Chengdu and its relationship with ground meteorological elements in seasonal,monthly and daily variation.The result shows that the PM 2.5 concentration differs in seasonal,monthly and diurnal variation,and the variation trend of six(6)monitoring stations is consistent.About 62%of the PM 2.5 is distributed in a humidity range of 80~100%,and about 85%of it is in a wind speed of 0~2 m·s-1.The ground wind speed is unfavorable to the horizontal transport,diffusion and dilution of PM 2.5 in Chengdu.The precipitation removal of PM 2.5 is increasing as its original concentration become larger,and cumulative rainfall duration become longer.

关 键 词：成都市 PM 2.5 地面气象要素 空气质量等级 

分 类 号：X513[环境科学与工程—环境工程] X16