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| Titel |
Swept under the carpet: organic matter burial decreases global ocean biogeochemical model sensitivity to remineralization length scale |
| VerfasserIn |
I. Kriest, A. Oschlies |
| 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 ; 10, no. 12 ; Nr. 10, no. 12 (2013-12-20), S.8401-8422 |
| Datensatznummer |
250085488
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| Publikation (Nr.) |
 copernicus.org/bg-10-8401-2013.pdf |
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| Zusammenfassung |
Although of substantial importance for marine tracer distributions and
eventually global carbon, oxygen, and nitrogen fluxes, the interaction
between sinking and remineralization of organic matter, benthic fluxes and
burial is not always represented consistently in global biogeochemical
models. We here aim to investigate the relationships between these processes
with a suite of global biogeochemical models, each simulated over millennia,
and compared against observed distributions of pelagic tracers and benthic
and pelagic fluxes.
We concentrate on the representation of sediment–water interactions in
common numerical models, and investigate their potential impact on simulated
global sediment–water fluxes and nutrient and oxygen distributions. We find
that model configurations with benthic burial simulate global oxygen well
over a wide range of possible sinking flux parameterizations, making the
model more robust with regard to uncertainties about the remineralization
length scale. On a global scale, burial mostly affects oxygen in the meso- to
bathypelagic zone. While all model types show an almost identical fit to
observed pelagic particle flux, and the same sensitivity to particle sinking
speed, comparison to observational estimates of benthic fluxes reveals a more
complex pattern, but definite interpretation is not straightforward because
of heterogeneous data distribution and methodology. Still, evaluating model
results against observed pelagic and benthic fluxes of organic matter can
complement model assessments based on more traditional tracers such as
nutrients or oxygen. Based on a combined metric of dissolved tracers and
biogeochemical fluxes, we here identify two model descriptions of burial as
suitable candidates for further experiments and eventual model refinements. |
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