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| Titel |
Evaluating Southern Ocean biological production in two ocean biogeochemical models on daily to seasonal timescales using satellite chlorophyll and O2 / Ar observations |
| VerfasserIn |
B. F. Jönsson, S. Doney, J. Dunne, M. L. Bender |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2015-02-04), S.681-695 |
| Datensatznummer |
250117797
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| Publikation (Nr.) |
 copernicus.org/bg-12-681-2015.pdf |
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| Zusammenfassung |
We assess the ability of ocean biogeochemical models to represent seasonal
structures in biomass and net community production (NCP) in the Southern
Ocean. Two models are compared to observations on daily to seasonal
timescales in four different sections of the region. We use daily satellite
fields of chlorophyll (Chl) as a proxy for biomass and in situ observations
of O2 and Ar supersaturation (ΔO2 / Ar) to estimate
NCP. ΔO2 / Ar is converted to the flux of biologically
generated O2 from sea to air (O2 bioflux). All data are aggregated
to a climatological year with a daily resolution. To account for potential
regional differences within the Southern Ocean, we conduct separate analyses
of sections south of South Africa, around the Drake Passage, south of
Australia, and south of New Zealand.
We find that the models simulate the upper range of Chl concentrations well,
underestimate spring levels significantly, and show differences in skill
between early and late parts of the growing season. While there is a great
deal of scatter in the bioflux observations in general, the four sectors each
have distinct patterns that the models pick up. Neither model exhibits
a significant distinction between the Australian and New Zealand sectors and
between the Drake Passage and African sectors. South of 60° S, the
models fail to predict the observed extent of biological O2
undersaturation. We suggest that this shortcoming may be due either to
problems with the ecosystem dynamics or problems with the vertical transport
of oxygen. |
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