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Water-soluble organic aerosol in the Los Angeles Basin and outflow regions: Airborne and ground measurements during the 2010 CalNex field campaign

Duong, Hanh T. and Sorooshian, Armin and Craven, Jill S. and Hersey, Scott P. and Metcalf, Andrew R. and Zhang, Xiaolu and Weber, Rodney J. and Jonsson, Haflidi and Flagan, Richard C. and Seinfeld, John H. (2011) Water-soluble organic aerosol in the Los Angeles Basin and outflow regions: Airborne and ground measurements during the 2010 CalNex field campaign. Journal of Geophysical Research D, 116 (D21). Art. No. D00V04. ISSN 0148-0227. http://resolver.caltech.edu/CaltechAUTHORS:20111219-141325461

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Abstract

A particle-into-liquid sampler coupled to a total organic carbon analyzer (PILS-TOC) quantified particulate water-soluble organic carbon (WSOC) mass concentrations during the May 2010 deployment of the Center for Interdisciplinary Remotely Piloted Aircraft Studies (CIRPAS) Twin Otter in the CalNex field study. WSOC data collected during 16 flights provide the first spatiotemporal maps of WSOC in the San Joaquin Valley, Los Angeles Basin, and outflow regions of the Basin. WSOC was consistently higher in concentration within the Los Angeles Basin, where sea breeze transport and Basin topography strongly influence the spatial distribution of WSOC. The highest WSOC levels were associated with fire plumes, highlighting the importance of both primary and secondary sources for WSOC in the region. Residual pollution layers enriched with WSOC are observed aloft up to an altitude of 3.2 km and the highest WSOC levels for each flight were typically observed above 500 m. Simultaneous ground WSOC measurements during aircraft overpasses in Pasadena and Riverside typically exhibit lower levels, especially when relative humidity (RH) was higher aloft suggestive of the influence of aerosol-phase water. This points to the underestimation of the radiative effects of WSOC when using only surface measurements. Reduced aerosol-phase water in the eastern desert outflow region likely promotes the re-partitioning of WSOC to the gas phase and suppression of processes to produce these species (partitioning, multiphase chemistry, photolytic production); as a result, WSOC is reduced relative to sulfate (but not as much as nitrate) as aerosol is advected from the Basin to the outflows.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2011JD016674 DOIArticle
http://www.agu.org/pubs/crossref/2011/2011JD016674.shtmlPublisherArticle
ORCID:
AuthorORCID
Sorooshian, Armin0000-0002-2243-2264
Metcalf, Andrew R.0000-0003-0385-1356
Jonsson, Haflidi0000-0003-3043-1074
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2011 by the American Geophysical Union. Received 3 August 2011; revised 21 September 2011; accepted 25 September 2011; published 18 November 2011. This work was supported by NOAA grant NA 09 OAR 4310128. Surface WSOC measurements were supported by the NSF under grants ATM‐0931492 and ATM‐0802237.
Funders:
Funding AgencyGrant Number
National Oceanic and Atmospheric Administration (NOAA)NA 09 OAR 4310128
NSFATM-0931492
NSFATM-0802237
Subject Keywords:CalNex; WSOC; organic aerosol; urban aerosol
Record Number:CaltechAUTHORS:20111219-141325461
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20111219-141325461
Official Citation:Duong, H. T., A. Sorooshian, J. S. Craven, S. P. Hersey, A. R. Metcalf, X. Zhang, R. J. Weber, H. Jonsson, R. C. Flagan, and J. H. Seinfeld (2011), Water-soluble organic aerosol in the Los Angeles Basin and outflow regions: Airborne and ground measurements during the 2010 CalNex field campaign, J. Geophys. Res., 116, D00V04, doi:10.1029/2011JD016674.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28524
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Dec 2011 22:31
Last Modified:02 May 2017 22:05

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