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The free radical chemistry of cloud droplets and its impact upon the composition of rain
Abstract
Calculations are presented that simulate the free radical chemistries of the gas phase and aqueous phase within a warm cloud during midday. It is demonstrated that in the presence of midday solar fluxes the heterogeneous scavenging of OH and HO 2 from the gas phase by cloud droplets can represent a major source of free radicals to cloud water, provided the accommodation or sticking coefficient for these species impinging upon water droplets is ≥10−4. The aqueous‐phase HO 2 radicals are found to be converted to H 2 O 2 by aqueous‐phase chemical reactions at a rate that suggests that this mechanism could produce a significant fraction of the H 2 O 2 found in cloud droplets. The rapid oxidation of sulfur species dissolved in cloudwater by this free‐radical‐produced H 2 O 2 as well as by aqueous‐phase OH radicals could conceivably have a significant impact upon the chemical composition of rain.
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Citations
Cited by
Heterogeneous chemistry and tropospheric ozone
Jacob, D. (2000) · Atmospheric Environment · doi:10.1016/s1352-2310(99)00462-8 · Cited by 1,289
Madronich, S. (1987) · Journal of Geophysical Research: Atmospheres · doi:10.1029/jd092id08p09740 · Cited by 804
Methane sulfonic acid in the marine atmosphere
Saltzman, E. S., Savoie, D. L., Zika, R. G., & Prospero, J. M. (1983) · Journal of Geophysical Research: Oceans · doi:10.1029/jc088ic15p10897 · Cited by 262
Sensitivity of tropospheric oxidants to global chemical and climate change
Thompson, A. M., Stewart, R. W., Owens, M. A., & Herwehe, J. A. (1989) · Atmospheric Environment (1967) · doi:10.1016/0004-6981(89)90001-2 · Cited by 102
Warneck, P. (1991) · Fresenius' Journal of Analytical Chemistry · doi:10.1007/bf00322434 · Cited by 50
Metadata
- Authors
- Chameides, W. L., & Davis, D. D.
- Venue
- Journal of Geophysical Research: Oceans
- Publisher
- American Geophysical Union (AGU)
- Published
- 1982-06-20
- Volume
- 87
- Issue
- C7
- Pages
- 4863-4877
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W1970652095
- Cited by
- 392
- References
- 0
- FWCI
- 24.70
- Type
- journal article
- Language
- en
- Open access
- closed
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- Chameides, W. L., & Davis, D. D. (1982). The free radical chemistry of cloud droplets and its impact upon the composition of rain. Journal of Geophysical Research: Oceans. https://doi.org/10.1029/jc087ic07p04863
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