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| 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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| Radenac, Marie-helene; Jouanno, Julien; Tchamabi, Christine Carine; Awo, Mesmin; Bourles, Bernard; Arnault, Sabine; Aumont, Olivier. |
| Ocean color observations show semiannual variations in chlorophyll in the Atlantic cold tongue with a main bloom in boreal summer and a secondary bloom in December. In this study, ocean color and in situ measurements and a coupled physical-biogeochemical model are used to investigate the processes that drive this variability. Results show that the main phytoplankton bloom in July-August is driven by a strong vertical supply of nitrate in May-July, and the secondary bloom in December is driven by a shorter and moderate supply in November. The upper ocean nitrate balance is analyzed and shows that vertical advection controls the nitrate input in the equatorial euphotic layer and that vertical diffusion and meridional advection are key in extending and... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00623/73546/73808.pdf |
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