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Spatial Variations of Acid Precipitation in Southern California

Liljestrand, Howard M. and Morgan, James J. (1981) Spatial Variations of Acid Precipitation in Southern California. Environmental Science and Technology, 15 (3). pp. 333-339. ISSN 0013-936X.

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Wet-precipitation-only samplers were used to collect acid . precipitation at nine sites in the Los Angeles basin of southern California during the 1978-1979 hydrolog1c year. Concentrations of the major cations (H^+, NH_4^+, Na^+, K^+, Ca_2^+, and Mg_2^+) and the major anions (Cl^-, NO_3^-, and SO_4^(2-)) as well as trace species were determined. The relative importances of natural and anthropogenic sources were calculated by a chemical balance. Variations of sea salt, soil dust, NH_4^+, SO_4^(2-), and NO_3^- contributions agreed with source ~istributions, scavenging, and advection patterns. The nitrate to non-sea-salt sulfate equivalent ratio varied from 0.4 near coastal stationary sources to 2.8 in rural mountain areas with a precipitation-weighted average ratio of 1.1. Equilibrium models are used to relate the chemical composition of rain water with P_(SO)_2, P_(NH)_3, P_(NO)_2, P_(NO), and P_(HNO)_3 during precipitation. Mass-balance calculations indicate that less than 2% of the anthropogenic emissions of NO_x and SO_x in southern California are locally scavenged on an annual basis.

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Additional Information:© 1981 American Chemical Society. Received for review July 14, 1980. Accepted October 20, 1980. This study was partially supported by a Du Pont Environmental Grant, the Ford/Exxon Research Program, an institutional grant from the Department of Energy, an equipment grant from Hewlett-Packard, and the State of California Air Resources Board.
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Ford/Exxon Research ProgramUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
California Air Resources BoardUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20160526-142716350
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Official Citation:Spatial variations of acid precipitation in southern California Howard M. Liljestrand and James J. Morgan Environmental Science & Technology 1981 15 (3), 333-339 DOI: 10.1021/es00085a010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67404
Deposited By: Ruth Sustaita
Deposited On:26 May 2016 21:45
Last Modified:03 Oct 2019 10:05

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