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| Titel |
Impact of variable air-sea O2 and CO2 fluxes on atmospheric potential oxygen (APO) and land-ocean carbon sink partitioning |
| VerfasserIn |
C. D. Nevison, N. M. Mahowald, S. C. Doney, I. D. Lima, N. Cassar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 3 ; Nr. 5, no. 3 (2008-06-02), S.875-889 |
| Datensatznummer |
250002528
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| Publikation (Nr.) |
 copernicus.org/bg-5-875-2008.pdf |
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| Zusammenfassung |
| A three dimensional, time-evolving field of atmospheric potential oxygen
(APO ~O2/N2+CO2) was estimated using surface
O2, N2 and CO2 fluxes from the WHOI ocean ecosystem model to
force the MATCH atmospheric transport model. Land and fossil carbon fluxes
were also run in MATCH and translated into O2 tracers using assumed
O2:CO2 stoichiometries. The modeled seasonal cycles in APO agree
well with the observed cycles at 13 global monitoring stations, with
agreement helped by including oceanic CO2 in the APO calculation. The
modeled latitudinal gradient in APO is strongly influenced by seasonal
rectifier effects in atmospheric transport. An analysis of the
APO-vs.-CO2 mass-balance method for partitioning land and ocean carbon
sinks was performed in the controlled context of the MATCH simulation, in
which the true surface carbon and oxygen fluxes were known exactly. This
analysis suggests uncertainty of up to ±0.2 PgC in the inferred sinks
due to variability associated with sparse atmospheric sampling. It also
shows that interannual variability in oceanic O2 fluxes can cause large
errors in the sink partitioning when the method is applied over short
timescales. However, when decadal or longer averages are used, the
variability in the oceanic O2 flux is relatively small, allowing carbon
sinks to be partitioned to within a standard deviation of 0.1 Pg C/yr of the
true values, provided one has an accurate estimate of long-term mean O2
outgassing. |
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