Impact of wind and freshwater inputs on phytoplankton biomass in the coral reef lagoon of New Caledonia during the summer cyclonic period: a coupled three-dimensional biogeochemical modeling approach

Autor: André Maurin, Stéphane Bujan, Christian Grenz, Christel Pinazo, Renaud Fichez, Pascal Douillet
Přispěvatelé: Laboratoire d'Océanographie Physique et Biologique ( LOPB ), Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Station Marine d'Endoume, Université de la Méditerranée - Aix-Marseille 2, UR Camelia, Institut de Recherche pour le Développement (IRD), Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement ( IRD ), Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Océanographie Physique et Biogéochimique (LOPB), Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2004
Předmět:
0106 biological sciences
[ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean
Atmosphere
PHYTOPLANCTON
010504 meteorology & atmospheric sciences
FONCTIONNEMENT DE L'ECOSYSTEME
01 natural sciences
LAGON
biogeochemistry
coupled physical-biological three-dimensional
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
Biomass (ecology)
geography.geographical_feature_category
[ SDU.STU.OC ] Sciences of the Universe [physics]/Earth Sciences/Oceanography
GREAT-BARRIER-REEF
Plankton
CHLOROPHYLLE
CARBONE
lagoon
Oceanography
GEOCHIMIE
HYDRODYNAMIQUE
NITROGEN-LIMITED GROWTH
COURANT PROFOND
MARINE PHYTOPLANKTON
Biogeochemical cycle
PACIFIC
CIRCULATION
Aquatic Science
ATOLL LAGOON
AZOTE
New Caledonia
Phytoplankton
SENSITIVITY ANALYSIS
14. Life underwater
Reef
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
0105 earth and related environmental sciences
ecosystem
geography
BIOMASSE
010604 marine biology & hydrobiology
Biogeochemistry
Pelagic zone
modeling
AMMONIUM
15. Life on land
MODELISATION
RECIF CORALLIEN
13. Climate action
TENSION DU VENT
phytoplankton
Environmental science
SOUTH-WEST LAGOON
Eutrophication
ADRIATIC SEA
Zdroj: Coral Reefs
Coral Reefs, Springer Verlag, 2004, 23 (2), pp.281-296. 〈10.1007/s00338-004-0378-x〉
Coral Reefs, Springer Verlag, 2004, 23, pp.281-296. ⟨10.1007/s00338-004-0378-x⟩
Coral Reefs, Springer Verlag, 2004, 23, pp.281-296. 〈10.1007/s00338-004-0378-x〉
Coral Reefs, 2004, 23, pp.281-296. ⟨10.1007/s00338-004-0378-x⟩
Coral Reefs, Springer Verlag, 2004, 23 (2), pp.281-296. ⟨10.1007/s00338-004-0378-x⟩
Coral Reefs, 2004, 23 (2), pp.281-296. ⟨10.1007/s00338-004-0378-x⟩
ISSN: 0722-4028
1432-0975
DOI: 10.1007/s00338-004-0378-x〉
Popis: International audience; A coupled three-dimensional physical-biological model was developed in order to simulate the ecological functioning and potential impacts of land-derived inputs in the southwest lagoon of New Caledonia. This model considered pelagic biogeochemical cycling of organic matter, taking into account advection and diffusion processes driven mainly by local wind fields and freshwater discharges. Modeled phytoplankton dynamics were strongly correlated with both freshwater nutrient inputs and wind-driven hydrodynamic processes, the latter resulting in a large input of oceanic water from the southeast part of the lagoon under trade wind conditions. In situ data obtained during the summer (January 1998) under trade wind conditions supported predicted concentration gradients along several coast to reef transects and provided a validation of the coupled physical-biogeochemical model. An additional sensitivity analysis showed that the alteration of the biogeochemical parameters did not strongly affect the results of the model. Freshwater inputs of nutrients were simulated using a realistic scenario corresponding to the summer rainy season of 1997-1998 in New Caledonia. Despite occasional flooding events from the main rivers considered in these simulations, no significant meso-scale phytoplankton bloom was identified. Hydrodynamically driven dispersion and rapid uptake of nutrients by phytoplankton were sufficient to spatially constrain the impact of river inputs and maintain oligotrophic conditions. The fine spatial grid of our three-dimensional model demonstrated that eutrophication in the southwest lagoon of New Caledonia is confined to the most restricted coastal embayments, while most of the lagoon experiences sustained oligotrophic conditions.
Databáze: OpenAIRE
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