Substantial secondary organic aerosol formation in a coniferous forest: observations of both day- and nighttime chemistry

Lee, Alex K. Y.; Abbatt, Jonathan P. D.; Leaitch, W. Richard; Li, Shao-Meng; Sjostedt, Steve J.; Wentzell, Jeremy J. B.; Liggio, John; Macdonald, Anne Marie

doi:10.5194/acp-16-6721-2016

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Substantial secondary organic aerosol formation in a coniferous forest: observations of both day- and nighttime chemistry

2016
By Lee, Alex K. Y. ; Abbatt, Jonathan P. D. ; Leaitch, W. Richard ; ...
Source: Atmospheric Chemistry and Physics, 16(11), 6721-6733

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Details:

Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Lee, Alex K. Y. ; Abbatt, Jonathan P. D. ; Leaitch, W. Richard ; Li, Shao-Meng ; Sjostedt, Steve J. ; ... More +

Lee, Alex K. Y. ; Abbatt, Jonathan P. D. ; Leaitch, W. Richard ; Li, Shao-Meng ; Sjostedt, Steve J. ; Wentzell, Jeremy J. B. ; Liggio, John ; Macdonald, Anne Marie Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSL (Chemical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSL (Chemical Sciences Laboratory) Less -
Description:

Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region in Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of aerosol mass spectrometry (AMS) measurement identified two types of BSOA (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation of monoterpenes and perhaps sesquiterpenes. The temporal variations of BSOA-1 and BSOA-2 can be explained by gas–particle partitioning in response to ambient temperature and the relative importance of different oxidation mechanisms between day and night. While BSOA-1 arises from gas-phase ozonolysis and nitrate radical chemistry at night, BSOA-2 is likely less volatile than BSOA-1 and consists of products formed via gas-phase oxidation by OH radical and ozone during the day. Organic nitrates produced through nitrate radical chemistry can account for 22–33 % of BSOA-1 mass at night. The mass spectra of BSOA-1 and BSOA-2 have higher values of the mass fraction of m/z 91 (f91) compared to the background organic aerosol. Using f91 to evaluate BSOA formation pathways in this unpolluted, forested region, heterogeneous oxidation of BSOA-1 is a minor production pathway of BSOA-2.
Keywords:

[+]

Aerosols Atmospheric Chemistry Forests And Forestry
Source:

Atmospheric Chemistry and Physics, 16(11), 6721-6733
DOI:

https://doi.org/10.5194/acp-16-6721-2016
Document Type:

Journal Article
Place as Subject:

Whistler (B.C.)
License:

https://creativecommons.org/licenses/by/3.0/
Rights Information:

CC BY
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:47d5557a930fd22de9a5ebbb614a88048d0924945a6b75c13d93415028405f79
Download URL:

https://repository.library.noaa.gov/view/noaa/51320/noaa_51320_DS1.pdf
File Type:

	Supplemental text	pdf
	Machine readable version (XML)	xml

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