气溶胶相氧化过程对α-蒎烯光氧化和臭氧氧化SOA生成的影响
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- 英文论文题名：Influence of aerosol-phase oxidation on SOA formation from the ozonolysis and OH-oxidation of α-pinene
- 论文作者：楚碧武 ; 贺泓
- 英文论文作者：Biwu Chu ; Hong He ; State Key Joint Laboratory of Environment Simulation and Pollution Control ; Research Center for Eco-Environment Sciences ; Chinese Academy of Sciences ; Center for Excellence in Urban Atmospheric Environment ; Institute of Urban Environment ; Chinese Academy of Sciences
- 年：2016
- 作者机构：环境模拟与污染控制国家重点联合实验室中国科学院生态环境研究中心;中国科学院城市大气环境研究卓越创新中心中国科学院城市环境研究所;
- 论文关键词：二次有机气溶胶 ; 气溶胶相氧化 ; 活性氧物种 ; a-蒎烯
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X513
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：123k
- 原文格式：D
- 会议级别：全国
摘要
二次有机气溶胶(SOA)是大气细颗粒物的重要组成[1],但由于其生成机制不清,导致模型模拟和观测数据之间存在较大偏差[2,3]。除了浓度之外,SOA的氧化程度也被低估[1,4]。气溶胶相的氧化过程可能对SOA的生成和氧化程度有重要影响。本研究利用一个9m3的烟雾箱,模拟了在不同气溶胶种子存在条件下,a-蒎烯光氧化和臭氧氧化体系中SOA的生成量和氧化程度变化。实验结果表明,相对于硫酸铵气溶胶种子,含铁硫酸盐种子的存在将通过Fenton反应等在气溶胶相产生活性氧物种(ROS)。这些ROS和气相氧化生成的SOA产物反应,在提高SOA的氧化性的同时,降低SOA的产率。这两种效应的相对大小在不同的氧化体系中存在明显差异,在a-蒎烯光氧化体系中主要表现为降低SOA产率,而在臭氧氧化体系中主要表现为提高SOA氧化程度。气溶胶相的氧化过程可能是SOA氧化程度被低估的主要原因之一。
To investigate the effects of sulfate seed aerosols on secondary organic aerosol(SOA) formation from the ozonolysis and OH-oxidation of a-pinene,a series of experiments were carried out using a 9 m3 smog chamber.Under similar conditions,less SOA with a higher oxidation degree was generated from both ozonolysis and OH-oxidation experiments in the presence of ferrous or ferric sulfate seed aerosols compare to that in the presence of ammonia sulfate.These findings may be explained by metal-mediated aerosol-phase oxidation of organics.The different degrees of the mass decreasing and oxidation level increasing between the ozonolysis and OH-oxidation experiments may be resulted in the different chemical composition and oxidation level of the generated SOA from gas-phase reaction in the two systems.These results would help to explain the high O/C ratio of organics in ambient particles that thus far cannot be reproduced in laboratory and model studies.
To investigate the effects of sulfate seed aerosols on secondary organic aerosol(SOA) formation from the ozonolysis and OH-oxidation of a-pinene,a series of experiments were carried out using a 9 m3 smog chamber.Under similar conditions,less SOA with a higher oxidation degree was generated from both ozonolysis and OH-oxidation experiments in the presence of ferrous or ferric sulfate seed aerosols compare to that in the presence of ammonia sulfate.These findings may be explained by metal-mediated aerosol-phase oxidation of organics.The different degrees of the mass decreasing and oxidation level increasing between the ozonolysis and OH-oxidation experiments may be resulted in the different chemical composition and oxidation level of the generated SOA from gas-phase reaction in the two systems.These results would help to explain the high O/C ratio of organics in ambient particles that thus far cannot be reproduced in laboratory and model studies.
引文
[1]Jimenez JL,Canagaratna MR,Donahue NM,et al.Science,2009,326(5959):1525-1529
[2]Volkamer R,Jimenez JL,San Martini F,et al.Geophysical Research Letters,2006,33(17):
[3]Wang S,Xing J,Chatani S,et al.Atmos Environ,2011,45(35):6347-6358
[4]Ng NL,Canagaratna MR,Zhang Q,et al.Atmos Chem Phys,2010,10(10):4625-4641
[2]Volkamer R,Jimenez JL,San Martini F,et al.Geophysical Research Letters,2006,33(17):
[3]Wang S,Xing J,Chatani S,et al.Atmos Environ,2011,45(35):6347-6358
[4]Ng NL,Canagaratna MR,Zhang Q,et al.Atmos Chem Phys,2010,10(10):4625-4641