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The Chemistry and Physics of Acid Fogs, Clouds and Haze Aerosol

Hoffmann, Michael R. and Waldman, Jed M. and Munger, J. William and Jacob, Daniel J. (1986) The Chemistry and Physics of Acid Fogs, Clouds and Haze Aerosol. In: Aerosols : Research, Risk Assessment, and Control Strategies. Lewis Publishers , Chelsea, MI, pp. 121-149. ISBN 0873710517.

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The chemistry of fogs, clouds, dew and rain at selected locations in California bas been observed over the last several years. Fog and cloud water in southern California often has extremely low pH values (i.e., 1.7 ≤ pH ≤ 4) and extremely high concentrations of sulfate, nitrate, ammonium ion and trace metals. A representative set of values reported by Waldman et al and Munger et al are given in Table I along with values reported for other sites around the world. Of special interest are the high values observed for SO_4^(2-), NO_3-, S(IV), CH_2O, Fe, Mn, Pb and Cu in fog water. These values and their time-dependent changes as shown in Figures 1 and 2 indicate that fogs provide a very reactive environment for the accumulation of HNO_3 and H_25O_4. Concomitant incorporation of NH_3 gas and calcareous dust into the droplet phase neutralizes some of the acidity.

Item Type:Book Section
Hoffmann, Michael R.0000-0001-6495-1946
Jacob, Daniel J.0000-0002-6373-3100
Additional Information:© 1986 Lewis Publishers. We are grateful to the California Air Resources Board, the National Center for Atmospheric Research, and the U.S. Environmental Protection Agency for their support of the research described above. In particular we would like to thank Dr. J. Calvert, Dr. M. Dodge, Dr. J. Holmes, Dr. D. Lawson, Dr. R. Papetti and Mr. E. Fujita for their assistance in making this research possible.
Funding AgencyGrant Number
California Air Resources Board (CARB)UNSPECIFIED
National Center for Atmospheric Research (NCAR)UNSPECIFIED
Environmental Protection Agency (EPA)UNSPECIFIED
Record Number:CaltechAUTHORS:20150825-091210618
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59874
Deposited By: Ruth Sustaita
Deposited On:25 Aug 2015 21:11
Last Modified:09 Mar 2020 13:18

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