鄂尔多斯市夏秋季黑碳气溶胶时间演变特征及其来源解析  

Temporal Evolution and Source Appointment of Black Carbon Aerosol in Ordos During Summer and Autumn 2019

作　　者：孔祥晨[1,2,3] 张连霞 张彩云 王红磊[3] 许晶[1] 郑佳锋[2] KONG Xiang-chen;ZHANG Lian-xia;ZHANG Cai-yun;WANG Hong-lei;XU Jing;ZHENG Jia-feng(Ordos Meteorological Bureau of Inner Mongolia,Ordos 017010,China;School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610000,China;Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044.China)

机构地区：[1]鄂尔多斯市气象局,鄂尔多斯017010 [2]成都信息工程大学大气科学学院,成都610000 [3]南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室,南京210044

出　　处：《环境科学》2022年第7期3439-3450,共12页Environmental Science

基　　金：江苏省自然科学基金项目(BK20180801);国家自然科学基金项目(41805096)。

摘　　要：使用AE-33于2019年8月12日至10月4日观测了黑碳(BC)浓度,结合PM、污染气体和气象要素数据、HYSPLIT模式、PSCF和CWT模式,分析了BC的时间演变特征、潜在来源及其主要影响区域.结果表明,ρ(BC)平均值为882 ng·m^(-3),占PM_(2.5)的质量分数为6.08%.ρ(BC)主要集中在200~1000 ng·m^(-3),占总样本数的55.9%.在不同BC浓度范围内,均是以BC_(液态)为主,平均占比为86%.BC和PM_(2.5)浓度的日变化均为单峰型分布,峰值分别位于08:00和10:00,峰值浓度分别增加了24.3%和47.2%.BC_(固态)的日变化为双峰型分布,峰值分别位于08:00和20:00,BC_(液态)的日变化为单峰型分布,峰值位于08:00.BC与NO_(2)的相关性较好,与SO_(2)的相关性较弱,说明BC受交通源的影响较大,受工业源的影响较小.影响鄂尔多斯市的主导气团可分为4类,南部气团(35.6%)、局地气团(26.9%),西北气团(18.8%)和东北气团(18.7%).鄂尔多斯市对下游地区的影响主要分为东北气团(40.9%)、西北气团(30.4%)和东南气团(28.7%).BC的CWT高值区主要位于南部的延安-铜川-宝鸡-汉中一带和吕梁-临汾-三门峡-南阳一带,为两条狭长的传输带,权重浓度超过1400 ng·m^(-3).BC的CWT高值影响区主要集中在乌海-巴彦淖尔-包头-呼和浩特一带,权重浓度超过900ng·m^(-3).BC的远距离输送影响范围可至南部的榆林-延安-铜川-宝鸡一带,东部的朔州-大同-北京一带和东北部的锡林郭勒盟-兴安盟-呼伦贝尔一带.In this study,black carbon(BC)aerosols were continuously observed using a seven-channel aethalometer(AE-33)in Ordos from August 12 to October 4,2019;using this data combined with article matter(PM),pollutant gas,and meteorological element data;a HYSPLIT model;and potential source contribution function(PSCF)and concentration-weighted trajectory(CWT)models,we analyzed the temporal evolution and potential source appointment and main influence areas of BC.The results showed that the average ofρ(BC)was 882 ng·m^(-3),accounting for 6.08%of PM_(2.5).Theρ(BC)was mainly concentrated at 200-1000 ng·m^(-3),accounting for 55.9%of the total samples.In different BC mass concentration ranges,BC_(liquid) was the mainstay,with an average proportion of 86%.The diurnal variations in BC and PM_(2.5)showed unimodal distributions,with peaks at 08:00 and 10:00,respectively,and peak concentrations increased by 24.3%and 47.2%,respectively.The diurnal variation in BC_(solid) showed a bimodal distribution,with peaks at 08:00 and 20:00,respectively.The diurnal variation in the BC_(liquid) showed a unimodal distribution with a peak at 08:00.The strong correlation between BC and NO_(2) indicated a greater impact of vehicle emissions on BC concentration,whereas the weak correlation between BC and SO_(2) indicated a lower impact of industrial emissions on BC concentration.The dominant air masses affecting the Ordos could be divided into four categories.The southern air masses(35.6%)had the highest mass concentration of atmospheric pollutants,followed by the local air masses(26.9%)and the northwest air masses(18.8%),and the northeast air masses(18.7%)had the lowest mass concentration of pollutants.The influence of the Ordos on the downstream areas was mainly divided into the northeast air masses(40.9%),the northwest air masses(30.4%),and the southeast air masses(28.7%).High CWT value areas of BC were mainly located in the southern Yan’an-Tongchuan-Baoji-Hanzhong areas and Lvliang-Linfen-Sanmenxia-Nanyang areas.They were two long and narrow

关 键 词：鄂尔多斯 黑碳(BC) 气溶胶 潜在来源 日变化 

分 类 号：X513[环境科学与工程—环境工程]