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| Titel |
3D modelling of the Black Sea ecosystem |
| VerfasserIn |
A. Capet, M. Gregoire, J.-M. Beckers, P. Joassin, J. Naithani, K. Soetart |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026727
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| Zusammenfassung |
| A coupled physical-biogeochemical model has been developed to simulate the ecosystem of
the Black Sea at the end of the 80's when eutrophication and invasion by gelatinous organisms
seriously affected the stability and dynamics of the system. The biogeochemical model
describes the cycle of carbon, nitrogen, silicate, oxygen and phosphorus through the foodweb
from bacteria to gelatinous carnivores and explicitly represents processes in the anoxic layer
down to the bottom. For calibration and analyses purposes, the coupled model has first been
run in 1D at several places in the Black Sea. The biogeochemical model involves some
hundred parameters which have been first calibrated by hand using published values. Then,
an identifiability analysis has been performed in order to determine a subset of 15 identifiable
parameters. An automatic calibration subroutine has been used to fine tune these
parameters. In 1D, the model solution exhibits a complex dynamics with several years of
transient adjustment. This complexity is imparted by the explicit modelling of top
predators. The model has been calibrated and validated using a large set of data
available in the Black Sea TU Ocean Base. The calibrated biogeochemical model is
implemented in a 3D hydrodynamical model of the Black Sea. Results of these 3D
simulations will be presented and compared with maps of in-situ data reconstructed from
available data base using the software DIVA (Data Interpolation and Variational
analysis). |
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