Elemental composition of organic aerosol: The gap between ambient and laboratory measurements
Name
Heald_Elemental composition.pdf
Size
992.99 KB
Format
Adobe PDF
Checksum (MD5)
b2f96b04a83032e9ec07dac623e746a5
Author(s)
Chen, Qi
Heald, Colette L.
Jimenez, Jose L.
Canagaratna, Manjula R.
Zhang, Qi
He, Ling-Yan
Huang, Xiao-Feng
Campuzano-Jost, Pedro
Palm, Brett B.
Poulain, Laurent
Date Issued
May 2015
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Chen, Qi, Colette L. Heald, Jose L. Jimenez, Manjula R. Canagaratna, Qi Zhang, Ling-Yan He, Xiao-Feng Huang, et al. “Elemental Composition of Organic Aerosol: The Gap Between Ambient and Laboratory Measurements.” Geophysical Research Letters 42, no. 10 (May 22, 2015): 4182–4189. © 2015 American Geophysical Union
Version
Final published version
Abstract
A large data set including surface, aircraft, and laboratory observations of the atomic oxygen-to-carbon (O:C) and hydrogen-to-carbon (H:C) ratios of organic aerosol (OA) is synthesized and corrected using a recently reported method. The whole data set indicates a wide range of OA oxidation and a trajectory in the Van Krevelen diagram, characterized by a slope of −0.6, with variation across campaigns. We show that laboratory OA including both source and aged types explains some of the key differences in OA observed across different environments. However, the laboratory data typically fall below the mean line defined by ambient observations, and little laboratory data extend to the highest O:C ratios commonly observed in remote conditions. OA having both high O:C and high H:C are required to bridge the gaps. Aqueous-phase oxidation may produce such OA, but experiments under realistic ambient conditions are needed to constrain the relative importance of this pathway.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1002/2015gl063693
