On the Source of Organic Acid Aerosol Layers above Clouds
Author
Sorooshian, Armin
Brechtel, Fred J.
Jonsson, Haflidi
Feingold, Graham
Seinfeld, John H.
Lu, Miao-Ling
Flagan, Richard C.
Date
2007Metadata
Show full item recordAbstract
During the July 2005 Marine Stratus/Stratocumulus
Experiment (MASE) and the August-September 2006 Gulf
of Mexico Atmospheric Composition and Climate Study
(GoMACCS), the Center for Interdisciplinary Remotely-Piloted
Aircraft Studies (CIRPAS) Twin Otter probed aerosols
and cumulus clouds in the eastern Pacific Ocean off the
coast of northern California and in southeastern Texas,
respectively. An on-board particle-into-liquid sampler (PILS)
quantified inorganic and organic acid species with e5-
min time resolution. Ubiquitous organic aerosol layers above
cloud with enhanced organic acid levels were observed
in both locations. The data suggest that aqueousphase
reactions to produce organic acids, mainly oxalic
acid, followed by droplet evaporation is a source of elevated
organic acid aerosol levels above cloud. Oxalic acid is
observed to be produced more efficiently relative to sulfate
as the cloud liquid water content increases, corresponding
to larger and less acidic droplets. As derived from
large eddy simulations of stratocumulus under the conditions
of MASE, both Lagrangian trajectory analysis and diurnal
cloudtop evolution provide evidence that a significant
fraction of the aerosol mass concentration above cloud
can be accounted for by evaporated droplet residual particles.
Methanesulfonate data suggest that entrainment of free
tropospheric aerosol can also be a source of organic acids
above boundary layer clouds.
Description
Environ. Sci. Technol., 41 (13), pp 4647-4654
The article of record as published may be located at http://dx.doi.org/ 10.1021/es0630442
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
Related items
Showing items related by title, author, creator and subject.
-
On the Link Between Ocean Biota Emissions, Aerosol, and Maritime Clouds: Airborne, Ground, and Satellite Measurements off the Coast of California
Sorooshian, Armin; Padro, Luz T.; Nenes, Athanasios; Feingold, Graham; McComiskey, Allison; Hersey, Scott P.; Gates, Harmony; Jonsson, Haflidi H.; Miller, Steven D.; Stephens, Graeme L.; Flagan, Richard C.; Seinfeld, John H. (2009);Surface, airborne, and satellite measurements over the eastern Pacific Ocean off the coast of California during the period between 2005 and 2007 are used to explore the relationship between ocean chlorophyll a, aerosol, ... -
Composition and hygroscopicity of the Los Angeles Aerosol: CalNex
Hersey, Scott P.; Craven, Jill S.; Metcalf, Andrew R.; Lin, Jack; Lathem, Terry; Suski, Kaitlyn J.; Cahill, John F.; Duong, Hanh T.; Sorooshian, Armin; Jonsson, Haflidi H.; Shiraiwa, Manabu; Zuend, Andreas; Nenes, Athanasios; Prather, Kimberly A.; Flagan, Richard C.; Seinfeld, John H. (2013);Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the ... -
Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis
Wang, Jian; Collins, Don; Covert, David; Elleman, Robert; Ferrare, Richard A.; Gasparini, Roberto; Jonsson, Haflidi; Ogren, John; Sheridan, Patrick; Tsay, Si-Chee (2006);Aerosol size distributions were measured by a Scanning Mobility Particle Sizer (SMPS) on board the CIRPAS Twin Otter aircraft during 16 flights at the Southern Great Plains (SGP) site in northern central Oklahoma as part ...