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MEPS 289:63-78 (2005)
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Abstract
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Modelling diatom and Phaeocystis blooms and nutrient cycles in the Southern Bight of the North Sea: the MIRO model
C. Lancelot1,*, Y. Spitz2, N. Gypens1, K. Ruddick3, S. Becquevort1, V. Rousseau1, G. Lacroix3, G. Billen4
1Université Libre de Bruxelles, Ecologie des Systèmes Aquatiques, CP-221, Boulevard du Triomphe, 1050 Brussels, Belgium 2Oregon State University, College of Oceanic and Atmospheric Sciences, 104 COAS Admin. Bldg.,
Corvallis, Oregon 97331, USA 3Royal Belgian Institute of Natural Sciences, Management Unit of the North Sea Mathematical Models, Gulledelle 100, 1200 Brussels, Belgium 4Université Pierre & Marie Curie (Paris VI),
UMR-CNRS 7619 Sisyphe, 4 Place Jussieu, 75005 Paris, France
*Email: lancelot@ulb.ac.be
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ABSTRACT: The link between anthropogenic nutrient loads and the magnitude and extent of diatom and Phaeocystis colony blooms in the Southern Bight of the North Sea was explored with the complex ecosystem model MIRO. The model was adapted for
resolving the changing nutrient loads, the complex biology of the bloom species and the tight coupling between the benthic and pelagic compartments that characterise this shallow coastal shelf sea ecosystem. State variables included the main inorganic
nutrients (nitrate [NO3], ammonium [NH4], phosphate [PO4] and dissolved silica [DSi]), 3 groups of phytoplankton with different trophic fates (diatoms, nanophytoflagellates and Phaeocystis colonies), 2 zooplankton
groups (copepods and microzooplankton), bacteria, and 5 classes of detrital organic matter with different biodegradability. The capability of the MIRO model to properly simulate the observed SWNE gradient in nutrient enrichment and the seasonal
cycle of inorganic and organic C and nutrients, phytoplankton, bacteria and zooplankton in the eastern English Channel and Southern Bight of the North Sea is demonstrated by running the model for the period from 1989 to 1999. The MIRO code was implemented
in a simplified multi-box representation of the hydrodynamic regime. These model runs give the first general view of the seasonal dynamics of Phaeocystis colony blooms and nutrient cycling within the domain. C, N and P budget calculations show that
(1) the coastal ecosystem has a low nutrient retention and elimination capacity, (2) trophic efficiency of the planktonic system is low, and (3) both are modulated by meteorological forcing.
KEY WORDS: North Sea · Eutrophication · Phaeocystis · Carbon budgets · Nutrients · Ecological modelling
Full text in pdf format
Supplementary appendix
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Published in MEPS Vol.
289
(2005) on March 30
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2005
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