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| Titel |
Tagged ozone mechanism for MOZART-4, CAM-chem and other chemical transport models |
| VerfasserIn |
L. K. Emmons, P. G. Hess, J.-F. Lamarque, G. G. Pfister |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 6 ; Nr. 5, no. 6 (2012-12-06), S.1531-1542 |
| Datensatznummer |
250002956
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| Publikation (Nr.) |
 copernicus.org/gmd-5-1531-2012.pdf |
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| Zusammenfassung |
| A procedure for tagging ozone produced from NO sources through updates to an existing chemical mechanism is described,
and results from its implementation in the Model for Ozone and Related chemical Tracers (MOZART-4), a global chemical transport
model, are presented. Artificial tracers are added to the mechanism, thus, not affecting the standard chemistry. The results
are linear in the troposphere, i.e., the sum of ozone from individual tagged sources equals the ozone from all sources to
within 3% in zonal mean monthly averages.
In addition, the tagged ozone is shown to equal the standard ozone, when all tropospheric sources are tagged and stratospheric
input is turned off.
The stratospheric ozone contribution to the troposphere determined from the
difference between total ozone and ozone from all tagged sources is significantly less than estimates using a traditional
stratospheric ozone tracer (8 vs. 20 ppbv at the surface). The commonly used technique of perturbing NO
emissions by 20% in a region to determine its ozone contribution is compared to the tagging technique, showing that the
tagged ozone is 2–4 times the ozone contribution that was deduced from perturbing emissions.
The ozone tagging described here is useful for identifying source contributions based on NO emissions in a given state of the
atmosphere, such as for quantifying the ozone budget. |
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