Why do organic aerosols exist? Understanding aerosol lifetimes using the two-dimensional volatility basis set

被引：95

作者：

Donahue, N. M. ^{[1
]}

Chuang, W. ^{[1
]}

Epstein, S. A. ^{[1
]}

Kroll, J. H. ^{[2
,3
]}

Worsnop, D. R. ^{[4
,5
]}

Robinson, A. L. ^{[1
]}

Adams, P. J. ^{[1
]}

Pandis, S. N. ^{[1
,6
]}

机构：

[1] Carnegie Mellon Univ, Ctr Atmospher Particle Studies, Pittsburgh, PA 15217 USA

[2] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

[3] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

[4] Aerodyne Res Inc, Billerica, MA 01821 USA

[5] Univ Helsinki, Dept Phys, FI-00014 Helsinki, Finland

[6] Univ Patras, Dept Chem Engn, GR-26500 Patras, Greece

来源：

ENVIRONMENTAL CHEMISTRY | 2013年 / 10卷 / 03期

基金：

美国国家科学基金会;

关键词：

ALPHA-PINENE; TROPOSPHERIC CHEMISTRY; ATMOSPHERIC AEROSOLS; PHASE; OXIDATION; OH; MASS; FUNCTIONALIZATION; FRAGMENTATION; PARTICLES;

D O I：

10.1071/EN13022

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Organic aerosols play a critical role in atmospheric chemistry, human health and climate. Their behaviour is complex. They consist of thousands of organic molecules in a rich, possibly highly viscous mixture that may or may not be in phase equilibrium with organic vapours. Because the aerosol is a mixture, compounds from all sources interact and thus influence each other. Finally, most ambient organic aerosols are highly oxidised, so the molecules are secondary products formed from primary emissions by oxidation chemistry and possibly non-oxidative association reactions in multiple phases, including gas-phase oxidation, aqueous oxidation, condensed (organic) phase reactions and heterogeneous interactions of all these phases. In spite of this complexity, we can make a strong existential statement about organic aerosol: They exist throughout the troposphere because heterogeneous oxidation by OH radicals is more than an order of magnitude slower than comparable gas-phase oxidation.

引用

页码：151 / 157

页数：7

共 50 条

[1] Gas-phase tropospheric chemistry of volatile organic compounds .1. Alkanes and alkenes [J].