Comparison of parameterized nitric acid rainout rates using a coupled stochastic-photochemical tropospheric model

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Comparisonofparameterizednitricacidrainoutratesusingacoupledstochasticphotochemicaltroposphericmodel.pdf (719.55 KB)

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https://agupubs.onlinelibrary.wiley.com/doi/10.1029/JD094iD04p05219

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https://doi.org/10.1029/JD094iD04p05219
 http://hdl.handle.net/11603/35030

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UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0002-7829-0920

Date

1989-04-20

Type of Work

journal articles
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Citation of Original Publication

Stewart, Richard W., Anne M. Thompson, Melody A. Owens, and Jerold A. Herwehe. “Comparison of Parameterized Nitric Acid Rainout Rates Using a Coupled Stochastic-Photochemical Tropospheric Model.” Journal of Geophysical Research: Atmospheres 94, no. D4 (1989): 5219–26. https://doi.org/10.1029/JD094iD04p05219.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

A major tropospheric loss of soluble species such as nitric acid (HNO₃) results from scavenging by water droplets. Several theoretical formulations have been advanced which relate an effective time independent loss rate for soluble species to statistical properties of precipitation such as the wet fraction and length of a precipitation cycle. There is not enough data available on trace species concentrations to test the computational results of alternative loss rate models against observations. Therefore in this paper, various “effective” loss rates that have been proposed are compared with the results of detailed time dependent model calculations carried out over a seasonal time scale. The model which we have developed for this purpose is a stochastic precipitation model coupled to a tropospheric photochemical model. The results of numerous time dependent seasonal model runs are used to derive numerical values for the nitric acid residence time for several assumed sets of precipitation statistics. These values are then compared with the results obtained by utilizing theoretical “effective” loss rates in time independent models.