Enhanced secondary organic aerosol formation due to water uptake by fine particles

被引：168

作者：

Hennigan, Christopher J. ^{[1
]}

Bergin, Michael H. ^{[1
,2
]}

Dibb, Jack E. ^{[3
]}

Weber, Rodney J. ^{[2
]}

机构：

[1] Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[3] Univ New Hampshire, Inst Study Earth Oceans & Space, Climate Change Res Ctr, Durham, NH 03824 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 18期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1029/2008GL035046

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This study characterizes the partitioning behavior of a significant fraction of the ambient organic aerosol through simultaneous measurements of gas and particle water-soluble organic carbon (WSOC). During the summer in Atlanta, WSOC gas/particle partitioning showed a strong RH dependence that was attributed to particulate liquid water. At elevated RH levels (>similar to 70%), a significant increase in WSOC partitioning to the particle phase was observed and followed the predicted water uptake by fine particles. The enhancement in particle-phase partitioning translated to increased median particle WSOC concentrations ranging from 0.3-0.9 mu g C m(-3). The results provide a detailed overview of the WSOC partitioning behavior in the summertime in an urban region dominated by biogenic emissions, and indicate that secondary organic aerosol formation involving partitioning to liquid water may be a significant aerosol formation route that is generally not considered.

引用

页数：5

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