基于示踪物监测的生物质燃烧对浙江省大气细颗粒物影响研究  

Study on the impact of biomass combustion on PM_(2.5)in Zhejiang based on tracer monitoring

作　　者：晁娜 王琼真 蒋琦清 孙琴琴 季政权 徐晓飞 顾震宇 CHAO Na;WANG Qiongzhen;JIANG Qiqing;SUN Qinqin;JI Zhengquan;XU Xiaofei;GU Zhenyu(Eco-Environment Science Research&Design Institute of Zhejiang Province,Hangzhou Zhejiang 310007;Key Laboratory of Environmental Pollution Control Technology of Zhejiang,Hangzhou Zhejiang 310007;Zhejiang Ecological and Environmental Monitoring Center,Hangzhou Zhejiang 310012;Zhejiang Lin’an Atmospheric Background National Observation and Research Station,Hangzhou Zhejiang 311300)

机构地区：[1]浙江省生态环境科学设计研究院,浙江杭州310007 [2]浙江省环境污染控制技术研究重点实验室,浙江杭州310007 [3]浙江省生态环境监测中心,浙江杭州310012 [4]浙江临安大气成分本底国家野外科学观测研究站,浙江杭州311300

出　　处：《环境污染与防治》2024年第12期1788-1794,1803,共8页Environmental Pollution & Control

基　　金：浙江省自然科学基金探索项目(No.LY22D050001);中央引导地方科技发展资金项目(No.2023ZY1024)。

摘　　要：于2019年9月至2020年8月在浙江省11个地市同步采集大气细颗粒物(PM_(2.5))样品,测定PM_(2.5)中生物质燃烧典型示踪物——左旋葡聚糖(LG)及K^(+)的浓度,分析生物质燃烧对PM_(2.5)的影响。结果表明,浙江LG年均质量浓度为43.3 ng/m^(3),LG的季均浓度为冬季>春季>秋季>夏季,衢州、丽水LG浓度偏高,海岛舟山LG浓度最低。LG浓度与气温相关性最强,气温高于25℃时LG浓度较低;气温低于18℃时LG浓度较高;当气温介于18~25℃时,LG浓度受相对湿度影响明显,当相对湿度高于90%时LG浓度会明显下降。大多样品LG/K^(+)小于1,表明浙江省生物质燃烧以农作物残余物燃烧为主。根据示踪物简化模型估算,生物质燃烧源对浙江省PM_(2.5)中有机碳(OC)的平均贡献为8.5%,冬季贡献率高达16.3%。研究结果将为浙江省PM_(2.5)污染防控措施的制定提供决策支撑。Atmospheric fine particulate matter(PM_(2.5))samples were collected simultaneously from 11 cities in Zhejiang from September 2019 to August 2020.The concentrations of levoglucosan(LG)and K^(+),two typical tracers of biomass burning,in PM_(2.5)were measured to analyze the impact of biomass burning on PM_(2.5).The results showed that the annual average mass concentration of LG in Zhejiang was 43.3 ng/m^(3).The seasonal average concentrations of LG were winter>spring>autumn>summer,with higher concentrations in Quzhou and Lishui,and the lowest concentration in the island city of Zhoushan.The concentration of LG had the strongest correlation with temperature;LG concentrations were lower when the temperature was above 25℃and higher when the temperature was below 18℃.When the temperature was between 18-25℃,LG concentrations were significantly influenced by relative humidity,with a marked decrease when the relative humidity exceeded 90%.The LG/K^(+)ratios of most samples were less than 1,indicating that biomass burning in Zhejiang primarily consisted of crop residue combustion.Based on the simplified tracer model estimation,the average contribution of biomass burning sources to organic carbon(OC)in PM_(2.5)of Zhejiang was 8.5%,with a contribution rate as high as 16.3%in winter.The research findings would provide decision support for the formulation of PM_(2.5)pollution prevention and control measures in Zhejiang.

关 键 词：生物质燃烧 左旋葡聚糖 时空分布 气象参数 K^(+) 有机碳 浙江 

分 类 号：X513[环境科学与工程—环境工程]