Constraining the contribution of organic acids and AMS m/z 44 to the organic aerosol budget: On the importance of meteorology, aerosol hygroscopicity, and region
Author
Sorooshian, Armin
Murphy, Shane M.
Hersey, Scott
Bahreini, Roya
Jonsson, Haflidi
Flagan, Richard C.
Seinfeld, John H.
Date
2010Metadata
Show full item recordAbstract
Airborne measurements in regions of varying meteorology
and pollution are used to quantify the contribution
of organic acids and a mass spectral marker for oxygenated
aerosols, m/z 44, to the total organic aerosol budget.
Organic acids and m/z 44 separately are shown to exhibit
their highest organic mass fractions in the vicinity of
clouds. The contribution of such oxygenated species is
shown to increase as a function of relative humidity,
aerosol hygroscopicity (and decreasing organic mass
fraction), and is typically greater off the California coast
versus the continental atmospheres studied. Reasons
include more efficient chemistry and partitioning of organic
acid precursors with increasing water in the reaction
medium, and high aqueous‐phase processing times in
boundary layers with higher cloud volume fractions. These
results highlight the importance of secondary organic
aerosol formation in both wet aerosols and cloud droplets.
Description
Geophysical Research Letters, Vol. 37, L21807
The article of record as published may be located at http://dx.doi.org/10.1029/2010GL044951
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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