石嘴山市大气颗粒物变化特征及潜在源区分析  

Analysis of the variation characteristics and potential source areas of atmospheric particulate matter in Shizuishan City

作　　者：李媛[1] 张芙蓉 LI Yuan;ZHANG Furong(School of Ecology and Environment,Ningxia University,Yinchuan Ningxia 750021)

机构地区：[1]宁夏大学生态环境学院,宁夏银川750021

出　　处：《环境污染与防治》2022年第8期1061-1067,共7页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.12062023);宁夏回族自治区重点研发项目(No.2016KJHM31);宁夏大学大学生创新创业训练计划项目(No.G2020107490035)。

摘　　要：在揭示石嘴山市2019—2020年大气颗粒物浓度随时间变化规律的基础上,采用混合单粒子拉格朗日综合轨迹(HYSPLIT)模型模拟每天4个时刻的气团后向轨迹,并按季节进行轨迹聚类及潜在源贡献因子(PSCF)分析,确定大气颗粒物的输送路径及潜在污染源区的贡献。结果显示:(1)在月变化层面,细颗粒物(PM_(2.5))、可吸入颗粒物(PM_(10))的月均质量浓度总体均呈现“W”型变化规律,PM_(2.5)的3个峰值分别出现在1月、5月和12月,PM_(10)在1月、4月、5月、11月明显高于其他月份。PM_(2.5)/PM_(10)在1月、12月相对较高,在4月、5月相对低值。在季节变化层面,PM_(2.5)和PM_(10)的季均浓度由高到低依次为冬季、春季、秋季、夏季,PM_(2.5)/PM_(10)表现为冬季高、春季低、夏秋季居中的变化特点;(2)石嘴山市气流轨迹存在明显的季节差异,冬季PM_(2.5)、PM_(10)以西北及东南方向的局地近距离污染输送为主,春季PM_(10)以西北方向的长距离输送为主;(3)在污染最重的冬季,对PM_(2.5)贡献大的区域主要位于内蒙古西南部、宁夏北部、甘肃东部及陕西西部地区,对PM_(10)贡献大的区域集中在内蒙古南部、陕西西北部。On the basis of revealing the variation law of atmospheric particulate matter concentration with time in Shizuishan City in 2019-2020,Hybrid Single Particle Lagrangian Integrated Trajector(HYSPLIT)model was used to simulate the backward trajectory of 4 moments per day,and the trajectory clustering and potential source contribution function(PSCF)analysis were carried out according to the season to determine the transport path and potential source areas of atmospheric particulate matter.The results showed that:(1)at the monthly chage level,the monthly average mass concentrations of PM_(2.5) and PM_(10) showed a“W”pattern of change trend.The three peaks of PM_(2.5) appeared in January,May and December respectively,and PM_(10) was significantly higher in January,April,May and November than that in other months.PM_(2.5)/PM_(10) was relatively high in January and December,and relatively low in April and May.At the seasonal change level,the seasonal average concentrations of PM_(2.5) and PM_(10) from high to low in the order of winter,spring,autumn and summer.PM_(2.5)/PM_(10) showed the characteristics of high in winter,low in spring,and middle in summer and autumn;(2)there were obvious seasonal differences in air flow trajectory in Shizuishan City.In winter,PM_(2.5) and PM_(10) were mainly transported from the northwest and southeast in surrounding area,and the transportation distance was short.In spring,PM_(10) was mainly transported from the northwest,and the transportation distance was long.(3)In the most polluted winter,the areas that contributed significantly to PM_(2.5) were mainly located in the southwest of Inner Mongolia,the north of Ningxia,the east of Gansu and the west of Shaanxi.The areas that contributed dgreatly to PM_(10) were concentrated in the south of Inner Mongolia and the northwest of Shaanxi.

关 键 词：大气颗粒物 后向轨迹 潜在源区 聚类分析 

分 类 号：X513[环境科学与工程—环境工程]