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Seasonal and Spatial Characteristics of Formic and Acetic Acids Concentrations in the Southern California Atmosphere

Nolte, Christopher G. and Solomon, Paul A. and Fall, Theresa and Salmon, Lynn G. and Cass, Glen R. (1997) Seasonal and Spatial Characteristics of Formic and Acetic Acids Concentrations in the Southern California Atmosphere. Environmental Science and Technology, 31 (9). pp. 2547-2553. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20160614-135826641

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Abstract

Formic and acetic acids measurements made during the year 1986 are reported for eight sites in the Los Angeles basin and one remote offshore site. Formic and acetic acids concentrations measured in marine air upwind of the Los Angeles area over an 8-month period average 1.4 and 0.6 ppb, respectively, while concentrations within the Los Angeles urban area average 2.7−5.8 ppb formic acid and 2.9−4.2 ppb acetic acid. Average formic and acetic acids concentrations exceed average HNO_3 and HCl concentra tions, making them the most abundant gas phase acids in the southern California atmosphere throughout the year. Formic and acetic acids concentrations near the coast change in proportion to changes in atmospheric dilution potential, as would be expected if formic and acetic acids were emitted directly from widespread area sources such as motor vehicle traffic. Downwind of Los Angeles, formic and acetic acids concentrations peak during the summer photochemi cal smog season, and concentration changes track both changes in atmospheric oxidant concentrations and markers for heterogeneous conversion within clouds or fog. Formic and acetic acids concentrations thus appear to arise both from direct emissions and from atmospheric chemical production, with the relative importance of these pathways varying spatially over the area surveyed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es960954iDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es960954iPublisherArticle
Additional Information:© 1997 American Chemical Society. Received for review November 12, 1996. Revised manuscript received May 12, 1997. Accepted May 20, 1997. Publication Date (Web): August 28, 1997. The data acquisition phase of this research was supported by the California Air Resources Board under agreement A4-144-32. Data interpretation was supported by the Electric Power Research Institute under agreement R3189-03.
Funders:
Funding AgencyGrant Number
California Air Resources BoardA4-144-32
Electric Power Research Institute (EPRI)R3189-03
Issue or Number:9
Record Number:CaltechAUTHORS:20160614-135826641
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160614-135826641
Official Citation:Seasonal and Spatial Characteristics of Formic and Acetic Acids Concentrations in the Southern California Atmosphere Christopher G. Nolte, Paul A. Solomon, Theresa Fall, Lynn G. Salmon, and Glen R. Cass Environmental Science & Technology 1997 31 (9), 2547-2553 DOI: 10.1021/es960954i
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67924
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Jun 2016 21:16
Last Modified:03 Oct 2019 10:09

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