南京市不同季节大气亚微米颗粒物化学组分在线观测研究  

On-line measurements of atmospheric submicron aerosol particle composition during different seasons in Nanjing

作　　者：胡丙鑫 汤莉莉[1,3] 张宁红[4] 张运江[1,5,6] 蒋磊[1,2] 崔玉航 花艳[1,2] 杨笑笑[1,2] HU Bingxin TANG Lili ZHANG Ninghong ZHANG Yunjiang JIANG Lei CUI Yuhang HUA Yan YANG Xiaoxiao(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology（ CICAEET）, Nanjing University of Information Science ＆ Technology, Nanjing 210044 Jiangsu Key Laboratory of Atmospheric Environmental Monitoring and Pollution Control, Nanjing 210044 Jiangsu Environmental Monitoring Center,Nanjing 210036 Jiangsu Department of Environmental Protection, Nanjing 210036 INERIS, Verneuil en Halatte 60550 Laboratoire des Sciences du Climat et l＇Environnement, CNRS-CEA-UVSQ, Gif sur Yvette 91191)

机构地区：[1]南京信息工程大学江苏省大气环境与装备技术协同创新中心,南京210044 [2]江苏省大气环境监测与污染控制高技术研究重点实验室,南京210044 [3]江苏省环境监测中心,南京210036 [4]江苏省环境保护厅,南京210036 [5]INERIS [6]Laboratoire des Sciences du Climat et l'Environnement,CNRS-CEA-UVSQ

出　　处：《环境科学学报》2017年第3期853-862,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重大研究计划(No.D0512;91544231);江苏省环保科研课题(No.2015017);江苏省环境监测科研基金项目(No.1016;1202)共同资助~~

摘　　要：本研究利用Aerodyne气溶胶化学组分监测仪在典型冬季重污染(12月)和夏季(8月)时期分别对南京城市大气非难熔性亚微米细颗粒物(NR-PM1)进行连续在线观测.结果表明,NR-PM1的组分平均贡献为(8月,12月):有机物(51.8%,44%)、硝酸盐(12.8%,23%)、硫酸盐(20.9%,13%)、铵盐(14%,16.8%)、氯化物(0.5%,3.2%).硝酸盐和硫酸盐在8月和12月呈现不同的日变化,如硝酸盐在12月白天呈现增加趋势,表明白天光化学作用对硝酸盐形成起主导作用;12月高浓度的硫酸盐在较高相对湿度的夜间被观测到,而8月在午后出现峰值,这表明在12月和8月硫酸盐的形成可能分别被液相生成和气相光化学作用驱动.8月臭氧污染期间,硝酸盐通过非均相反应在夜间快速形成,日出后,SO_2-4和氧化态有机气溶胶(OOA)同时增加表明二次气溶胶的形成;12月霾污染期间,二次无机组分和具有较高氧化度的OOA逐渐增加.Real-time compositional measurements of atmospheric submicron aerosol particle（ NR-PM1） were conducted in urban Nanjing during heavy pollution episodes in December and August 2013 using an Aerodyne Aerosol Chemical Speciation Monitor. NR-PM1 compositions were organics（ 51.8%and 44%）,nitrate（ 12.8% and 23%）,sulfate（ 20.9% and 13%）,ammonium（ 14% and 16.8%）,and chloride（ 0.5% and 3.2%） in December and August,respectively. The secondary inorganic aerosols,e.g.,sulfate and nitrate,showed quite different diurnal variations in December and August. For example,nitrate presented a gradual increase during daytime in December,suggesting that daytime photochemistry played a more important role in nitrate formation. The high concentration of sulfate was mainly observed under highly relative humidity（ RH） conditions during nighttime in December,but it showed a significant noon peak during daytime in August. This means that the sulfate formation might be driven by RH-dependent pathway in December and gas-phase photochemical processing in August,respectively. During ozone pollution episodes in August,oxygenated OA（ OOA） showed a significant enhancement along with sulfate during daytime,indicating regional influence on secondary aerosol formation. Both secondary inorganic and OOA presented a significant enhancement during heavy pollution episodes in December,highlighting the importance of regional secondary aerosols in the formation of severe pollution episodes in Nanjing.

关 键 词：ACSM 大气亚微米颗粒物 日变化 相对湿度 

分 类 号：X513[环境科学与工程—环境工程]