冬季PM2.5中含碳气溶胶的污染特征——长江三角洲地区一次区域重污染过程分析

被引:13
作者
沙丹丹 [1 ]
王红磊 [1 ]
朱彬 [1 ]
林旭 [2 ]
郭婷 [3 ]
施双双 [1 ]
蒋琳 [1 ]
李月娥 [1 ]
机构
[1] 南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室
[2] 杭州市环境监测中心站
[3] 蚌埠市气象局
基金
国家重点研发计划;
关键词
长三角地区; PM2.5; 区域重污染过程; OC; EC; 源解析;
D O I
暂无
中图分类号
X513 [粒状污染物];
学科分类号
摘要
2015年1月16~26日长江三角洲(以下简称长三角)地区出现了一次持续区域性重污染过程,为研究重污染过程期间含碳气溶胶的区域分布特征及其来源.使用中流量采样器分别对南京、苏州和临安1月13~28日PM2.5进行了连续采样,并使用Model 2001A热/光碳分析仪分析了样品中的有机碳(OC)和元素碳(EC)含量.结果表明:长江三角洲地区冬季重污染过程中以PM2.5污染为主,南京、苏州、临安PM2.5的平均浓度分别为176.84,176.65,158.07μg/m3,是清洁天的1.91、2.01和2.97倍.含碳气溶胶是PM2.5的重要组成部分,总碳(TC,TC=OC+EC)占PM2.5的比例分别为南京(18%)、苏州(21%)、临安(23%).轻度污染天和中/重度污染天,长三角地区PM2.5中OC的平均浓度分别为20.75,32.64μg/m3,为清洁天的1.66和2.61倍;EC的平均浓度分别为5.41,8.87μg/m3,为清洁天的2.06和3.37倍.污染过程中不同碳组分的变化特征不同.一次有机碳(POC)、二次有机碳(SOC)、焦炭(Char-EC)的浓度随着污染程度的加剧而不断上升;烟炱(Soot-EC)随着污染程度变化较小.4个采样时段中,OC、EC浓度峰值出现于15:00~20:40时段.污染期间,长三角地区含碳气溶胶的主要来源为燃煤和机动车尾气,同时还有部分生物质燃烧源的影响,柴油车尾气的影响较弱.清洁天,影响长三角地区的气团主要来自于海洋上空,气团较为清洁,碳气溶胶来源简单;污染天气团主要来自于我国西北地区及长三角周边省份,受到外来输送与本地源排放的影响,使得碳气溶胶来源变得相对复杂.
引用
收藏
页码:3611 / 3622
页数:12
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