Journal article
Mineral dust is a sink for chlorine in the marine boundary layer
Atmospheric environment (1994), Vol.41(34), pp.7166-7179
2007
DOI: 10.1016/j.atmosenv.2007.05.047
Abstract
Dust particles affect the budgets of important traces gases by providing a surface on which heterogeneous reactions can occur. The uptake of soluble species on dust alters the physical, chemical, and optical properties and the overall ability of dust to act as cloud condensation and ice nuclei. It is commonly assumed that all measured chloride in particulate filter samples is associated with sea-salt particles and any chloride in dust occurs as the result of internal mixtures of sea-salt and dust particles, formed by cloud processing. Here we show high temporal resolution data demonstrating the direct uptake of chlorine by dust via heterogeneous reaction with HCl(g). This reaction added significant amounts of chlorine to the dust particles during a major dust storm, representing 4–9% of the individual dust particle mass. Up to 65±4% of the dust particles contained chlorine due to this heterogeneous reaction during the dust front. Ignoring this process leads to an overestimation of sea-salt concentrations from bulk measurements, and an underestimation of the degree of sea-salt aging. The uptake of chloride will change the pH and hygroscopic properties of the dust and thus can influence the budgets of other reactive gases. Including this heterogeneous process in atmospheric measurements and chemical transport models will improve our ability to predict the atmosphere's composition and radiation budget with greater accuracy.
Details
- Title: Subtitle
- Mineral dust is a sink for chlorine in the marine boundary layer
- Creators
- Ryan C Sullivan - Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0314, USASergio A Guazzotti - Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0314, USADavid A Sodeman - Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0314, USAYouhua Tang - Center for Global and Regional Environmental Research, University of Iowa, Iowa City, IA 52242, USAGregory R Carmichael - Center for Global and Regional Environmental Research, University of Iowa, Iowa City, IA 52242, USAKimberly A Prather - Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0314, USA
- Resource Type
- Journal article
- Publication Details
- Atmospheric environment (1994), Vol.41(34), pp.7166-7179
- DOI
- 10.1016/j.atmosenv.2007.05.047
- ISSN
- 1352-2310
- eISSN
- 1873-2844
- Publisher
- Elsevier Ltd
- Language
- English
- Date published
- 2007
- Academic Unit
- Civil and Environmental Engineering; Nursing; Chemical and Biochemical Engineering
- Record Identifier
- 9984003434002771
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