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Chemical characterization of stratus cloudwater and its role as a vector for pollutant deposition in a Los Angeles pine forest

Waldman, Jed M. and Munger, J. William and Jacob, Daniel J. and Hoffmann, Michael R. (1985) Chemical characterization of stratus cloudwater and its role as a vector for pollutant deposition in a Los Angeles pine forest. Tellus B, 37B (2). pp. 91-108. ISSN 0280-6509. https://resolver.caltech.edu/CaltechAUTHORS:20150818-100954821

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Abstract

Highly concentrated, acidic stratus cloudwater was monitored as it intercepted a pine forest (Henninger Flats) 25 km northeast of Los Angeles. Observed pH values ranged from 2.06 to 3.87 for over 100 samples collected in 1982 and 1983 with a median value below pH 3. The ratio of nitrate/sulfate in cloudwater samples was between 1.5 and 2: rainwater at the same site had a ratio of approximately 1. The solute deposition accompanying several light. spring rains (summing to ~1 % of annual rainfall) was a disproportionate fraction of the annual total: H^+. NO_3 and SO _4^2 were -20% or more. Based on a reasonable estimate of fog precipitation, deposition of sulfate, nitrate and free acidity due to intercepting stratus clouds may be of comparable magnitude as that due to the incident rainfall at Henninger Flats. Cloudwater that had deposited on local pine needles was collected. It was in general more concentrated than ambient cloudwater but with comparable acidity. Enrichment of K^+ and Ca^(2+) in those samples and in throughfall is believed to be due to leaching from foliar surfaces. Injury to sensitive plant tissue has been noted in the literature when prolonged exposure to this severe kind of micro-environment has been imposed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1600-0889.1985.tb00058.xDOIArticle
http://www.tellusb.net/index.php/tellusb/article/view/15001PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:This journal is published under the terms of the Creative Commons Attribution 4.0 International (CC-BY 4.0) License. Manuscript received June 25; in final form December 4. 1984. We are grateful to the Los Angeles Fire Department Forestry Bureau for allowing us to conduct our field monitoring at Henninger Flats and to the Rangers at the site for their assistance. This research has been supported by a contract with the California Air Resources Board (Contract No. A2-048-32), with additional support from the Coordinating Research Council.
Funders:
Funding AgencyGrant Number
California Air Resources Board (CARB)A2-048-32
Issue or Number:2
Record Number:CaltechAUTHORS:20150818-100954821
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150818-100954821
Official Citation:WALDMAN, J. M., MUNGER, J. W., JACOB, D. J. and HOFFMANN, M. R. (1985), Chemical characterization of stratus cloudwater and its role as a vector for pollutant deposition in a Los Angeles pine forest. Tellus B, 37B: 91–108. doi: 10.1111/j.1600-0889.1985.tb00058.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59692
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Aug 2015 22:29
Last Modified:03 Oct 2019 08:49

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