Role of mineral aerosol as a reactive surface in the global troposphere
Identifieur interne : 000E05 ( Main/Exploration ); précédent : 000E04; suivant : 000E06Role of mineral aerosol as a reactive surface in the global troposphere
Auteurs : Frank J. Dentener ; Gregory R. Carmichael ; Yang Zhang ; Jos Lelieveld ; Paul J. CrutzenSource :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 1996-10-20.
Abstract
A global three‐dimensional model of the troposphere is used to simulate the sources, abundances, and sinks of mineral aerosol and the species involved in the photochemical oxidant, nitrogen, and sulfur cycles. Although the calculated heterogeneous removal rates on mineral aerosol are highly uncertain, mainly due to poorly known heterogeneous reaction rates, the reaction of SO2 on calcium‐rich mineral aerosol is likely to play an important role downwind of arid source regions. This is especially important for regions in Asia, which are important and increasing emitters of sulfur compounds. Our results indicate that the assumption that sulfate aerosol follows an accumulation mode size distribution, is particularly in Asia likely to overestimate the sulfate aerosol climate‐cooling effect. An even larger fraction of gas phase nitric acid may be associated with and neutralized by mineral aerosol. Interactions of N2O5, O3, and HO2‐radicals with dust are calculated to affect the photochemical oxidant cycle, causing ozone decreases up to 10% in and nearby the dust source areas. Comparison of these results with limited available measurements indicates that the proposed reactions can indeed take place, although due to a lack of measurements a rigorous evaluation is not possible at this time.
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DOI: 10.1029/96JD01818
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Crutzen</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:09474D71E23C2CDB80C94237CAC602A6ED57393B</idno><date when="1996" year="1996">1996</date><idno type="doi">10.1029/96JD01818</idno><idno type="url">https://api.istex.fr/document/09474D71E23C2CDB80C94237CAC602A6ED57393B/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">000A88</idno><idno type="wicri:Area/Main/Curation">000A76</idno><idno type="wicri:Area/Main/Exploration">000E05</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Exploration">000E05</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Role of mineral aerosol as a reactive surface in the global troposphere</title><author wicri:is="90%"><name sortKey="Dentener, Frank J" sort="Dentener, Frank J" uniqKey="Dentener F" first="Frank J." last="Dentener">Frank J. Dentener</name></author><author wicri:is="90%"><name sortKey="Carmichael, Gregory R" sort="Carmichael, Gregory R" uniqKey="Carmichael G" first="Gregory R." last="Carmichael">Gregory R. Carmichael</name></author><author wicri:is="90%"><name sortKey="Zhang, Yang" sort="Zhang, Yang" uniqKey="Zhang Y" first="Yang" last="Zhang">Yang Zhang</name></author><author wicri:is="90%"><name sortKey="Lelieveld, Jos" sort="Lelieveld, Jos" uniqKey="Lelieveld J" first="Jos" last="Lelieveld">Jos Lelieveld</name></author><author wicri:is="90%"><name sortKey="Crutzen, Paul J" sort="Crutzen, Paul J" uniqKey="Crutzen P" first="Paul J." last="Crutzen">Paul J. Crutzen</name></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Atmospheres</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1996-10-20">1996-10-20</date><biblScope unit="volume">101</biblScope><biblScope unit="issue">D17</biblScope><biblScope unit="page" from="22869">22869</biblScope><biblScope unit="page" to="22889">22889</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">09474D71E23C2CDB80C94237CAC602A6ED57393B</idno><idno type="DOI">10.1029/96JD01818</idno><idno type="ArticleID">96JD01818</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">A global three‐dimensional model of the troposphere is used to simulate the sources, abundances, and sinks of mineral aerosol and the species involved in the photochemical oxidant, nitrogen, and sulfur cycles. Although the calculated heterogeneous removal rates on mineral aerosol are highly uncertain, mainly due to poorly known heterogeneous reaction rates, the reaction of SO2 on calcium‐rich mineral aerosol is likely to play an important role downwind of arid source regions. This is especially important for regions in Asia, which are important and increasing emitters of sulfur compounds. Our results indicate that the assumption that sulfate aerosol follows an accumulation mode size distribution, is particularly in Asia likely to overestimate the sulfate aerosol climate‐cooling effect. An even larger fraction of gas phase nitric acid may be associated with and neutralized by mineral aerosol. Interactions of N2O5, O3, and HO2‐radicals with dust are calculated to affect the photochemical oxidant cycle, causing ozone decreases up to 10% in and nearby the dust source areas. Comparison of these results with limited available measurements indicates that the proposed reactions can indeed take place, although due to a lack of measurements a rigorous evaluation is not possible at this time.</div></front></TEI><affiliations><list></list><tree><noCountry><name sortKey="Carmichael, Gregory R" sort="Carmichael, Gregory R" uniqKey="Carmichael G" first="Gregory R." last="Carmichael">Gregory R. Carmichael</name><name sortKey="Crutzen, Paul J" sort="Crutzen, Paul J" uniqKey="Crutzen P" first="Paul J." last="Crutzen">Paul J. Crutzen</name><name sortKey="Dentener, Frank J" sort="Dentener, Frank J" uniqKey="Dentener F" first="Frank J." last="Dentener">Frank J. Dentener</name><name sortKey="Lelieveld, Jos" sort="Lelieveld, Jos" uniqKey="Lelieveld J" first="Jos" last="Lelieveld">Jos Lelieveld</name><name sortKey="Zhang, Yang" sort="Zhang, Yang" uniqKey="Zhang Y" first="Yang" last="Zhang">Yang Zhang</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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