Characterization of a large biogenic secondary organic aerosol event from eastern Canadian forests

被引：109

作者：

Slowik, J. G. ^{[1
]}

Stroud, C. ^{[2
]}

Bottenheim, J. W. ^{[2
]}

Brickell, P. C. ^{[2
]}

Chang, R. Y. -W. ^{[1
]}

Liggio, J. ^{[2
]}

Makar, P. A. ^{[2
]}

Martin, R. V. ^{[3
,4
]}

Moran, M. D. ^{[2
]}

Shantz, N. C. ^{[1
,2
]}

Sjostedt, S. J. ^{[1
]}

van Donkelaar, A. ^{[3
]}

Vlasenko, A. ^{[1
,2
]}

Wiebe, H. A. ^{[2
]}

Xia, A. G. ^{[2
]}

Zhang, J. ^{[2
]}

Leaitch, W. R. ^{[2
]}

Abbatt, J. P. D. ^{[1
]}

机构：

[1] Univ Toronto, Dept Chem, Toronto, ON M5S 1A1, Canada

[2] Environm Canada, Sci & Technol Branch, Toronto, ON, Canada

[3] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS, Canada

[4] Harvard Smithsonian Ctr Astrophys, Atom & Mol Phys Div, Cambridge, MA 02138 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2010年 / 10卷 / 06期

关键词：

POSITIVE MATRIX FACTORIZATION; CLOUD CONDENSATION NUCLEI; MULTISCALE GEM MODEL; MASS-SPECTROMETER; MEXICO-CITY; HIGH-RESOLUTION; ALPHA-PINENE; PHOTOCHEMICAL OXIDATION; SOURCE APPORTIONMENT; LIGHT-SCATTERING;

D O I：

10.5194/acp-10-2825-2010

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Measurements of aerosol composition, volatile organic compounds, and CO are used to determine biogenic secondary organic aerosol (SOA) concentrations at a rural site 70 km north of Toronto. These biogenic SOA levels are many times higher than past observations and occur during a period of increasing temperatures and outflow from Northern Ontario and Quebec forests in early summer. A regional chemical transport model approximately predicts the event timing and accurately predicts the aerosol loading, identifying the precursors as monoterpene emissions from the coniferous forest. The agreement between the measured and modeled biogenic aerosol concentrations contrasts with model underpredictions for polluted regions. Correlations of the oxygenated organic aerosol mass with tracers such as CO support a secondary aerosol source and distinguish biogenic, pollution, and biomass burning periods during the field campaign. Using the Master Chemical Mechanism, it is shown that the levels of CO observed during the biogenic event are consistent with a photochemical source arising from monoterpene oxidation. The biogenic aerosol mass correlates with satellite measurements of regional aerosol optical depth, indicating that the event extends across the eastern Canadian forest. This regional event correlates with increased temperatures, indicating that temperature-dependent forest emissions can significantly affect climate through enhanced direct optical scattering and higher cloud condensation nuclei numbers.

引用

页码：2825 / 2845

页数：21

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