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A dynamic model for the production of H^+NO_3^−, and SO_4^(2−) in urban fog

Jacob, Daniel J. and Hoffmann, Michael R. (1983) A dynamic model for the production of H^+NO_3^−, and SO_4^(2−) in urban fog. Journal of Geophysical Research C, 88 (C11). pp. 6611-6621. ISSN 0148-0227. doi:10.1029/JC088iC11p06611.

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The chemical composition of nighttime urban fog has been investigated using a hybrid kinetic and equilibrium model. Extremely high acidity may be imparted to the droplets by condensation and growth on acidic condensation nuclei or by in situ S(IV) oxidation. Important oxidants of S(IV) were found to be O_2 as catalyzed by Fe(III) and Mn(II), H_2O_2, and O_3. Formation of hydroxymethanesulfonate ion (HMSA) via the nucleophilic addition of HSO_3^− to CH_2O(I) significantly increased the droplet capacity for S(IV) but did not slow down the net S(IV) oxidation rate leading to fog acidification. Gas phase nitric acid, ammonia, and hydrogen peroxide were scavenged efficiently, although aqueous phase hydrogen peroxide was depleted rapidly by reduction with S(IV). Nitrate production in the aqueous phase was found to be dominated by HNO_3 gas phase scavenging. Major aqueous phase species concentrations were controlled primarily by condensation, evaporation, and pH.

Item Type:Article
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URLURL TypeDescription
Jacob, Daniel J.0000-0002-6373-3100
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1983 American Geophysical Union. Received October 4, 1982; revised April 14, 1983; accepted April 14, 1983.
Issue or Number:C11
Record Number:CaltechAUTHORS:20150820-073729013
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Official Citation:Jacob, D. J., and M. R. Hoffmann (1983), A dynamic model for the production of H+ NO3 −, and SO4 2− in urban fog, J. Geophys. Res., 88(C11), 6611–6621, doi:10.1029/JC088iC11p06611.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59781
Deposited By: Ruth Sustaita
Deposited On:20 Aug 2015 15:52
Last Modified:10 Nov 2021 22:25

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