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Displacements and transformations of nitrate-rich and nitrate-poor water masses in the tropical Pacific during the 1997 El Nino ArchiMer
Radenac, Marie-helene; Dandonneau, Yves; Blanke, Bruno.
A Lagrangian analysis was applied to the outputs of a coupled physical-biogeochemical model to describe the redistribution of nitrate-rich and nitrate-poor surface water masses in the tropical Pacific throughout the major 1997 El Nino. The same tool was used to analyze the causes of nitrate changes along trajectories and to investigate the consequences of the slow nitrate uptake in the high nutrient low chlorophyll (HNLC) region during the growth phase of the event. Three patterns were identified during the drift of water masses. The first mechanism is well known along the equator: oligotrophic waters from the western Pacific are advected eastward and retain their oligotrophic properties along their drift. The second concerns the persistent upwelling in...
Tipo: Text Palavras-chave: Lagrangian analysis; El Nino; Tropical Pacific; Nitrate uptake.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-938.pdf
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