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| Titel |
Comparing forward and inverse models to estimate the seasonal variation of hemisphere-integrated fluxes of carbonyl sulfide |
| VerfasserIn |
A. J. Kettle, U. Kuhn, M. Hobe, J. Kesselmeier, P. S. Liss, M. O. Andreae |
| 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 ; 2, no. 5 ; Nr. 2, no. 5 (2002-11-14), S.343-361 |
| Datensatznummer |
250000655
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| Publikation (Nr.) |
 copernicus.org/acp-2-343-2002.pdf |
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| Zusammenfassung |
| A simple inverse model is proposed to deduce hemisphere-integrated COS flux based on published
time series of total column COS. The global atmosphere is divided into two boxes representing the
Northern and Southern Hemispheres, and the total column COS data from several stations are used
to calculate hemispheric COS loadings. The integrated flux within each hemisphere is calculated as a
linear combination of a steady-state solution and time-varying perturbation. The nature of the time-varying
perturbation is deduced using two different approaches: an analytic solution based on a
cosine function that was fitted to the original total column COS measurement time series and a
Simplex optimization with no underlying assumption about the functional form of the total column
time series. The results suggest that there is a steady-state COS flux from the Northern to the
Southern Hemisphere. There is a seasonal variation superimposed on this flux that in the Southern
Hemisphere has a maximum rate of COS input into the atmosphere around January and a maximum
rate of COS removal from the atmosphere around August--September. In the Northern
Hemisphere, the maximum rate of COS input into the atmosphere is around May--June, and the
maximum rate of COS removal is either August or January, depending on which station in the
Northern Hemisphere is considered. The results of the inverse model are compared with the
outcome of a forward approach on the temporal and spatial variation of the dominant global
sources and sinks published earlier. In general, the deduced hemisphere-integrated flux estimates
showed good agreement with the database estimates, though it remains uncertain whether COS
removal from the atmosphere in the Northern Hemisphere is dominated by plant and soil uptake in
the boreal summer or by oceanic uptake in boreal winter. |
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