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
Murphy, Shane M.
Flagan, Richard C.
Seinfeld, John H.
MetadataShow full item record
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.
Geophysical Research Letters, Vol. 37, L21807The article of record as published may be located at http://dx.doi.org/10.1029/2010GL044951
Showing items related by title, author, creator and subject.
Speciation of Organic Aerosols in the Tropical Mid-Pacific and their Relationship to Light Scattering Crahan, Kathleen K.; Hegg, Dean A.; Covert, David S.; Reid, Jeffrey S.; Kehlif, Djmal; Brooks, Barbara J.; Jonsson, Haflidi (2004);Although the importance of the aerosol contribution to the global radiative budget has been recognized, the forcings of aerosols in general, and specifically the role of the organic component in these forcings, still ...
McAtee, Michael D. (1987-12);The effects of synoptic waves on the dynamics of planetary waves are investigated using normal mode analysis. Initialized analyses of the Navy Operational Global Atmospheric Prediction System (NOGAPS) for 19 days between ...
Kereki, Laszlo (Monterey, California. Naval Postgraduate School, 1998-06-01);This study was written with an aim to suggest a security policy approach for Hungary after becoming a member of NATO. The formulation of the country's security policy started with examination of security threats in general ...