The photochemistry of carbon monoxide in the stratosphere and mesosphere evaluated from observations by the Microwave Limb Sounder on the Aura satellite
Identifieur interne : 001B54 ( Main/Exploration ); précédent : 001B53; suivant : 001B55The photochemistry of carbon monoxide in the stratosphere and mesosphere evaluated from observations by the Microwave Limb Sounder on the Aura satellite
Auteurs : K. Minschwaner [États-Unis] ; G. L. Manney [États-Unis] ; N. J. Livesey [États-Unis] ; H. C. Pumphrey [Royaume-Uni] ; H. M. Pickett [États-Unis] ; L. Froidevaux [États-Unis] ; A. Lambert [États-Unis] ; M. J. Schwartz [États-Unis] ; P. F. Bernath [Canada, Royaume-Uni] ; K. A. Walker [Canada] ; C. D. Boone [Canada]Source :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 2010-07-16.
Abstract
The photochemical production and loss rates for carbon monoxide (CO) in the stratosphere and mesosphere are evaluated using measurements from the Aura Microwave Limb Sounder (MLS) and the Atmospheric Chemistry Experiment‐Fourier Transform Spectrometer (ACE‐FTS). The distributions of reactive trace gases involved in the photochemistry of CO, including OH, CH4, O(1D), Cl, as well as temperatures for calculating reaction rates, are either directly observed or constrained from observations. We map the CO net production and loss as a function of pressure (10–0.02 hPa, about 30–75 km altitude), latitude (approximately ±70°), and season. The results indicate that photochemical loss dominates over production for nearly all conditions considered here. A minimum photochemical loss lifetime of about 10 days occurs near the 2 hPa pressure level, and it follows the region of maximum sunlight exposure. At high latitudes during winter, the CO lifetime is generally longer than 30 days. Time scales become much shorter in spring, however, when CO lifetimes can be 15–20 days poleward of 60° latitude in the upper stratosphere. On the basis of these results, CO is a suitable tracer during autumn to spring above the 0.1 hPa pressure level but not in the upper stratosphere near 1 hPa.
Url:
DOI: 10.1029/2009JD012654
Affiliations:
- Canada, Royaume-Uni, États-Unis
- Nouveau-Mexique, Ontario, Écosse
- Toronto, Édimbourg
- Université d'Édimbourg, Université de Toronto
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Livesey</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Microwave Atmospheric Science Team, Jet Propulsion Laboratory, California Institute of Technology, California, Pasadena</wicri:regionArea><wicri:noRegion>Pasadena</wicri:noRegion></affiliation></author><author><name sortKey="Pumphrey, H C" sort="Pumphrey, H C" uniqKey="Pumphrey H" first="H. C." last="Pumphrey">H. C. Pumphrey</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Geoscience, University of Edinburgh, Edinburgh</wicri:regionArea><placeName><settlement type="city">Édimbourg</settlement><region type="country">Écosse</region><settlement type="city">Édimbourg</settlement></placeName><orgName type="university">Université d'Édimbourg</orgName></affiliation></author><author><name sortKey="Pickett, H M" sort="Pickett, H M" uniqKey="Pickett H" first="H. M." last="Pickett">H. M. Pickett</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Microwave Atmospheric Science Team, Jet Propulsion Laboratory, California Institute of Technology, California, Pasadena</wicri:regionArea><wicri:noRegion>Pasadena</wicri:noRegion></affiliation></author><author><name sortKey="Froidevaux, L" sort="Froidevaux, L" uniqKey="Froidevaux L" first="L." last="Froidevaux">L. Froidevaux</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Microwave Atmospheric Science Team, Jet Propulsion Laboratory, California Institute of Technology, California, Pasadena</wicri:regionArea><wicri:noRegion>Pasadena</wicri:noRegion></affiliation></author><author><name sortKey="Lambert, A" sort="Lambert, A" uniqKey="Lambert A" first="A." last="Lambert">A. 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Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2010-07-16">2010-07-16</date><biblScope unit="volume">115</biblScope><biblScope unit="issue">D13</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">D1213ED728757D54543293297938D9F918B49D42</idno><idno type="DOI">10.1029/2009JD012654</idno><idno type="ArticleID">2009JD012654</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">The photochemical production and loss rates for carbon monoxide (CO) in the stratosphere and mesosphere are evaluated using measurements from the Aura Microwave Limb Sounder (MLS) and the Atmospheric Chemistry Experiment‐Fourier Transform Spectrometer (ACE‐FTS). The distributions of reactive trace gases involved in the photochemistry of CO, including OH, CH4, O(1D), Cl, as well as temperatures for calculating reaction rates, are either directly observed or constrained from observations. We map the CO net production and loss as a function of pressure (10–0.02 hPa, about 30–75 km altitude), latitude (approximately ±70°), and season. The results indicate that photochemical loss dominates over production for nearly all conditions considered here. A minimum photochemical loss lifetime of about 10 days occurs near the 2 hPa pressure level, and it follows the region of maximum sunlight exposure. At high latitudes during winter, the CO lifetime is generally longer than 30 days. Time scales become much shorter in spring, however, when CO lifetimes can be 15–20 days poleward of 60° latitude in the upper stratosphere. On the basis of these results, CO is a suitable tracer during autumn to spring above the 0.1 hPa pressure level but not in the upper stratosphere near 1 hPa.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Nouveau-Mexique</li><li>Ontario</li><li>Écosse</li></region><settlement><li>Toronto</li><li>Édimbourg</li></settlement><orgName><li>Université d'Édimbourg</li><li>Université de Toronto</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Minschwaner, K" sort="Minschwaner, K" uniqKey="Minschwaner K" first="K." last="Minschwaner">K. Minschwaner</name></noRegion><name sortKey="Froidevaux, L" sort="Froidevaux, L" uniqKey="Froidevaux L" first="L." last="Froidevaux">L. Froidevaux</name><name sortKey="Lambert, A" sort="Lambert, A" uniqKey="Lambert A" first="A." last="Lambert">A. Lambert</name><name sortKey="Livesey, N J" sort="Livesey, N J" uniqKey="Livesey N" first="N. J." last="Livesey">N. J. Livesey</name><name sortKey="Manney, G L" sort="Manney, G L" uniqKey="Manney G" first="G. L." last="Manney">G. L. Manney</name><name sortKey="Manney, G L" sort="Manney, G L" uniqKey="Manney G" first="G. L." last="Manney">G. L. Manney</name><name sortKey="Minschwaner, K" sort="Minschwaner, K" uniqKey="Minschwaner K" first="K." last="Minschwaner">K. Minschwaner</name><name sortKey="Pickett, H M" sort="Pickett, H M" uniqKey="Pickett H" first="H. M." last="Pickett">H. M. Pickett</name><name sortKey="Schwartz, M J" sort="Schwartz, M J" uniqKey="Schwartz M" first="M. J." last="Schwartz">M. J. Schwartz</name></country><country name="Royaume-Uni"><region name="Écosse"><name sortKey="Pumphrey, H C" sort="Pumphrey, H C" uniqKey="Pumphrey H" first="H. C." last="Pumphrey">H. C. Pumphrey</name></region><name sortKey="Bernath, P F" sort="Bernath, P F" uniqKey="Bernath P" first="P. F." last="Bernath">P. F. Bernath</name></country><country name="Canada"><noRegion><name sortKey="Bernath, P F" sort="Bernath, P F" uniqKey="Bernath P" first="P. F." last="Bernath">P. F. Bernath</name></noRegion><name sortKey="Boone, C D" sort="Boone, C D" uniqKey="Boone C" first="C. D." last="Boone">C. D. Boone</name><name sortKey="Walker, K A" sort="Walker, K A" uniqKey="Walker K" first="K. A." last="Walker">K. A. Walker</name><name sortKey="Walker, K A" sort="Walker, K A" uniqKey="Walker K" first="K. A." last="Walker">K. A. Walker</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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