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| Titel |
Impact of resolved scales on global marine biogeochemical models |
| VerfasserIn |
William McKiver, Marcello Vichi, Tomas Lovato, Andrea Storto, Simona Masina |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098394
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| Publikation (Nr.) |
 EGU/EGU2014-14068.pdf |
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| Zusammenfassung |
| Here we examine the impact of resolving mesoscale processes on the global marine
biogeochemical system by performing simulations at two different resolutions, 2° (LO-res)
and 1-4° resolution (HI-res) using the PELAGOS model. Both the LO-res and HI-res
simulations are set up with the same forcings and biogeochemical parameterizations, while
the initial conditions are provided by a spinup of the LO-res simulation. This allows us to
perform a direct inter-comparison of the two cases with a view to understanding how the
introduction of mesoscale features affects the biogeochemical system, specifically
how differences in the resolved horizontal and vertical motions are reflected in
the plankton biomass and the nutrient availability. While the global large-scale
oceanographic features (fronts, gyres, etc) are captured in both the LO-res and
HI-res simulations, differences in the mesoscale flow structures, and in particular the
resolved vertical physics in the HI-res simulation generate very different behaviour
in the biogeochemical system. These differences in the physics drives what is a
spun-up biogeochemical system in the LO-res simulation into a new regime in the
HI-res simulation with significant reduction of typical low resolution biases. Coastal
features are well reproduced due to stronger Ekman upwelling at the continental
margins and increased eddy kinetic energy in the Southern Ocean reduces the winter
overestimation. These biases in the model are a result of inadequate vertical dynamics. |
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