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Biogeochemical modeling in the open waters of the Gulf of Mexico: Seasonal , interannual and mesoscale variability of the chlorophyll concentration
Poster Title: Biogeochemical modeling in the open waters of the Gulf of Mexico: Seasonal , interannual and mesoscale variability of the chlorophyll concentration
Submitted on 20 Feb 2018
Author(s): P. Damien, O. Pasqueron de Fommervault , J. Sheinbaum , J. Jouanno & O. Duteil
Affiliations: CICESE
This poster was presented at OSM18
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Poster Information
Abstract: Ocean color satellite measurements in the Gulf of Mexico open waters evidenced a clear seasonal variability in the surface chlorophyll concentration. Recent investigations in subtropical oligotrophic regions suggested that the surface chlorophyll increase may not be systematically associated to a real biomass increase but may results from physiological mechanisms. This finding may be relevant in the Gulf of Mexico as suggested by bio-optical measurements recently acquired by APEX profiling floats. Despite the increasing amount of observations in the Gulf of Mexico open waters, data are still lacking to regionalize the seasonal and interannual variability of the chlorophyll vertical structure or to investigate how the energetic mesoscale dynamics within the Gulf of Mexico modulate the chlorophyll distribution. To overcome these limitations, we set up an eddy resolving (1/12deg) coupled bio-physical model (NEMO-PISCES) of the Gulf of Mexico. The use of recent sets of observations allowed for a careful evaluation of the vertical distribution of the nutrient and chlorophyll concentrations throughout the different seasons. The analysis of the seasonal variability of the integrated chlorophyll content revealed a much more contrasted and complex behavior than the basin scale homogeneous pattern of variability inferred from modeled and observed surface chlorophyll concentration. We show that the variability of the mixed-layer depth strongly shape the seasonal distribution of the chlorophyll concentration but also its year to year variability. Finally, we investigate some of the physical-biogeochemical coupling processes specific to GoM sub-regions and mesoscale dynamics (in particular the Loop Current and Loop Current eddies).Summary: Biogeochemical modeling in the open-waters of the Gulf of Mexico: seasonal, interannual and
mesoscale variability of the chlorophyll concentration
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