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| Titel |
Evaluation of model-simulated source contributions to tropospheric ozone with aircraft observations in the factor-projected space |
| VerfasserIn |
C. Shim, Y. Wang, Y. Yoshida |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 6 ; Nr. 8, no. 6 (2008-03-26), S.1751-1761 |
| Datensatznummer |
250005938
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| Publikation (Nr.) |
 copernicus.org/acp-8-1751-2008.pdf |
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| Zusammenfassung |
| Trace gas measurements of TOPSE and TRACE-P experiments and corresponding
global GEOS-Chem model simulations are analyzed with the Positive Matrix
Factorization (PMF) method for model evaluation purposes. Specially, we
evaluate the model simulated contributions to O3 variability from
stratospheric transport, intercontinental transport, and production from
urban/industry and biomass burning/biogenic sources. We select a suite of
relatively long-lived tracers, including 7 chemicals (O3, NOy,
PAN, CO, C3H8, CH3Cl, and 7Be) and 1 dynamic tracer
(potential temperature). The largest discrepancy is found in the
stratospheric contribution to 7Be. The model underestimates this
contribution by a factor of 2–3, corresponding well to a reduction of
7Be source by the same magnitude in the default setup of the standard
GEOS-Chem model. In contrast, we find that the simulated O3
contributions from stratospheric transport are in reasonable agreement with
those derived from the measurements. However, the springtime increasing
trend over North America derived from the measurements are largely
underestimated in the model, indicating that the magnitude of simulated
stratospheric O3 source is reasonable but the temporal distribution
needs improvement. The simulated O3 contributions from long-range
transport and production from urban/industry and biomass burning/biogenic
emissions are also in reasonable agreement with those derived from the
measurements, although significant discrepancies are found for some regions. |
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