Sulfate and nitrate chemistry in cumuliform clouds: Fid-Bau Portal

Fachinformationsdienst BAUdigital

A platform for research: civil engineering, architecture and urbanism

Sulfate and nitrate chemistry in cumuliform clouds

Hegg, D́ean A. / Hobbs, Peter V.

Abstract Analyses of chemical measurements in and around cumuliform clouds in the western portion of Washington State indicate that for the 13 cases studied the mean sulfate production was 0.9 μg m⁻³ with an uncertainty of 0.5 μg m⁻³. Mean nitrate production in the clouds did not differ significantly from zero at the 90% confidence level. Nitrite concentrations in the cloud water (up to 0.19 ppm) appeared to be greater than can be explained by the absorption of $NO x$ and HNO2. The following mean values and standard deviations were obtained for scavenging coefficients between cloud base and a few hundred meters above cloud base: $0.6 ± 0.2$ for sub-μm aerosol, $0.7 ± 0.4$ for sulfate, $0.9 ± 0.2$ for particulate nitrate, $0.9 ± 0.2$ for gaseous nitrate, and $0.9 ± 0.1$ for total nitrate. Comparisons of the measurements of sulfate production and the pH of the cloud water for four of the cumulus clouds with values obtained from an adiabatic, Lagrangian parcel model suggest that the measurements are explicable in terms of currently accepted aqueous SO2 oxidation mechanisms.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Sulfate and nitrate chemistry in cumuliform clouds

Hegg, D́ean A. / Hobbs, Peter V.

Abstract Analyses of chemical measurements in and around cumuliform clouds in the western portion of Washington State indicate that for the 13 cases studied the mean sulfate production was 0.9 μg m⁻³ with an uncertainty of 0.5 μg m⁻³. Mean nitrate production in the clouds did not differ significantly from zero at the 90% confidence level. Nitrite concentrations in the cloud water (up to 0.19 ppm) appeared to be greater than can be explained by the absorption of $NO x$ and HNO2. The following mean values and standard deviations were obtained for scavenging coefficients between cloud base and a few hundred meters above cloud base: $0.6 ± 0.2$ for sub-μm aerosol, $0.7 ± 0.4$ for sulfate, $0.9 ± 0.2$ for particulate nitrate, $0.9 ± 0.2$ for gaseous nitrate, and $0.9 ± 0.1$ for total nitrate. Comparisons of the measurements of sulfate production and the pH of the cloud water for four of the cumulus clouds with values obtained from an adiabatic, Lagrangian parcel model suggest that the measurements are explicable in terms of currently accepted aqueous SO2 oxidation mechanisms.

Sulfate and nitrate chemistry in cumuliform clouds

Hegg, D́ean A. / Hobbs, Peter V.

Abstract Analyses of chemical measurements in and around cumuliform clouds in the western portion of Washington State indicate that for the 13 cases studied the mean sulfate production was 0.9 μg m⁻³ with an uncertainty of 0.5 μg m⁻³. Mean nitrate production in the clouds did not differ significantly from zero at the 90% confidence level. Nitrite concentrations in the cloud water (up to 0.19 ppm) appeared to be greater than can be explained by the absorption of $NO x$ and HNO2. The following mean values and standard deviations were obtained for scavenging coefficients between cloud base and a few hundred meters above cloud base: $0.6 ± 0.2$ for sub-μm aerosol, $0.7 ± 0.4$ for sulfate, $0.9 ± 0.2$ for particulate nitrate, $0.9 ± 0.2$ for gaseous nitrate, and $0.9 ± 0.1$ for total nitrate. Comparisons of the measurements of sulfate production and the pH of the cloud water for four of the cumulus clouds with values obtained from an adiabatic, Lagrangian parcel model suggest that the measurements are explicable in terms of currently accepted aqueous SO2 oxidation mechanisms.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Document information

Title:

Sulfate and nitrate chemistry in cumuliform clouds

Contributors:

Hegg, D́ean A. (author) / Hobbs, Peter V. (author)

Published in:

Atmospheric Environment ; 20 ; 901-909

Publication date:

1985-10-07

Size:

9 pages

ISSN:

DOI:

https://doi.org/10.1016/0004-6981(86)90274-X

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Cloud chemistry , sulfate chemistry , nitrate chemistry

Similar titles

Simulation of Sulfate and Nitrate Chemistry in Power Plant Plumes

Karamchandani, Prakash / Seigneur, Christian | Taylor & Francis Verlag | 1999

Measurements of sulfate production in natural clouds

Hegg, Dean A. / Hobbs, Peter V. | Elsevier | 1982

Aqueous phase sulfate production in clouds in eastern China

Shen, Xinhua / Lee, Taehyoung / Guo, Jia et al. | Elsevier | 2012

Tropospheric Sulfate and Nitrate Formation in the Presence of Dust

Zhang, Y. / Carmichael, G. R. / Air and Waste Management Association | British Library Conference Proceedings | 1992

Near-infrared spectroscopic study of basic aluminum sulfate and nitrate

Kloprogge, J. T. / Ruan, H. / Frost, R. L. | British Library Online Contents | 2001