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Introducing dynamic benthic fluxes in 3D biogeochemical model : an application on the Black Sea North-Western shelf
Capet, Arthur; Meysman, Filip; Soetaert, Karline et al.
2013the 45th International Liège Colloquium : Primary production in the ocean: from the synoptic to the global scale.
 

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Keywords :
Black Sea; biogeochemical modelling; benthic-pelagic coupling
Abstract :
[en] While benthic and sediment processes are now recognized as major components of the shelf iogeochemical budget, their representation in 3D biogeochemical model has for long been oversimplified [Soetaert et al., 2000]. These oversimplified formulations of the bottom boundary onditions prevent to account for the response of diagenetic processes to the environment. The onsequent absence of spatial and temporal variability of benthic/pelagic fluxes may lead to mis- valuation of important terms in the biogeochemical budgets (e.g. Oxygen, Nitrogen, Carbon, hosphate). More importantly, feedbacks mechanisms within the ecosystem response to utrophication may be overlooked, such as, for instance, the sensitivity of benthic denitrification o the oxygen content in the bottom waters. The GHER-ECO 3D biogeochemical model is xtended ith a refined benthic component explicitly accounting for the effect of organic matter transport, eposition and resuspension and for the influence of the environmental conditions on the iagenetic pathways. A semi-empirical approach allows to reproduce the variability and feedbacks riven by benthic diagenesis without the computational burden of a vertically resolved sediment ayer. This simplification allows to use the coupled model for the long term runs (several ecades) required to appreciate the slow dynamics introduced by the accumulation of organic atter in the sediment layer during the years of high riverine discharge. The extended model has een implemented for the Black Sea North western shelf [Capet et al., 2012]. After a presentation f the main assumptions used to construct the benthic module, re- sults are analyzed with a focus n (1) spatial and seasonal variability of benthic diagenesis and con- sequent benthic/pelagic xchanges, (2) comparison to in-situ estimates of benthic/pelagic dissolved fluxes, (3) implication n biogeochemical budgets and eutrophication issue. Inherent limitations of the semi-empirical pproach are discussed in the perspective of the current challenges addressed to biogeochemical odels.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Capet, Arthur  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Meysman, Filip;  NIOO - KNAW , Yerseke, The Netherlands
Soetaert, Karline;  NIOO - KNAW , Yerseke, The Netherlands
Grégoire, Marilaure  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Language :
English
Title :
Introducing dynamic benthic fluxes in 3D biogeochemical model : an application on the Black Sea North-Western shelf
Publication date :
15 April 2013
Event name :
the 45th International Liège Colloquium : Primary production in the ocean: from the synoptic to the global scale.
Event place :
Liège, Belgium
Event date :
13-17 May 2013
Audience :
International
European Projects :
FP7 - 287600 - PERSEUS - Policy-oriented marine Environmental Research in the Southern EUropean Seas
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 17 December 2013

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