Modelling the biogeochemical cycles of elements limiting primary production in the English channel .1. Role of thermohaline stratification

Type Article
Date 1997-01
Language English
Author(s) Menesguen Alain1, Hoch Thierry1
Affiliation(s) 1 : IFREMER, CTR BREST, LAB CHIM & MODELISAT CYCLES NAT, DIRECT ENVIRONM & AMENAGEMENT LITTORAL, BP 70, F-29280 PLOUZANE, FRANCE.
Source Marine Ecology Progress Series (0171-8630) (Inter-research), 1997-01 , Vol. 146 , N. 1-3 , P. 173-188
DOI 10.3354/meps146173
WOS© Times Cited 37
Keyword(s) ecological box-model, thermohaline stratification, English Channel, primary production
Abstract This paper presents the general framework of an ecological model of the English Channel. The model is a result of combining a physical sub-model with a biological one. in the physical submodel, the Channel is divided into 71 boxes and water fluxes between them are calculated automatically. A 2-layer, vertical thermohaline model was then linked with the horizontal circulation scheme. This physical sub-model exhibits thermal stratification in the western Channel during spring and summer and haline stratification in the Bay of Seine due to high flow rates from the river. The biological sub-model takes 2 elements, nitrogen and silicon, into account and divides phytoplankton into diatoms and dinoflagellates. Results from this ecological model emphasize the influence of stratification on chlorophyll a concentrations as well as on primary production. Stratified waters appear to be much less productive than well-mixed ones. Nevertheless, when simulated production values are compared with literature data, calculated production is shown to be underestimated. This could be attributed to a lack of refinement of the 2-layer box-model or processes omitted from the biological model, such as production by nanoplankton.
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