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The data products available for analysis here are output from the NASA Ocean Biogeochemical Model (NOBM). The NOBM is a coupled three-dimensional model incorporating general circulation, biogeochemical, and radiative components. The Ocean General Circulation Model (OGCM) is a reduced-gravity representation of circulation fields (Schopf and Loughe, 1995). The biogeochemical processes model contains four phytoplankton functional groups, four nutrient groups, a herbivore group, and three detrital pools. The radiative transfer calculations are provided by the Ocean-Atmosphere Radiative Model (OARM, Gregg 2002 (PDF) ). The forcing inputs to the model are provided by NCEP Reanalysis, OISST, GOCART, TOMS, and ISCCP. Full documentation of the model is found in Gregg and Casey 2006 (PDF).
Data assimilation is accomplished by the Conditional Relaxation Analysis Method. The data used for assimilation is SeaWiFS remotely-sensed chlorophyll data. The assimilation method forces constant readjustment, or "course correction", of the model parameters, based on the chlorophyll data acquired by the sensor ( Gregg 2006 (PDF) ). The output data products from the NOBM available for analysis in Giovanni are: Total Chlorophyll, Diatoms, Chlorophytes, Cyanobacteria, Coccolithophores (expressed in units of mg/m³), nitrate (µMol), and mixed layer depth (meters). |
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| References:
Schopf, P., and Loughe, A., 1995: A reduced gravity isopycnal model: Hindcasts of El Niño. Mon. Wea. Rev. 123: 2839-2863. Gregg, W. W., 2002: A coupled ocean-atmosphere radiative model for global ocean biogeochemical models (PDF). NASA Global Modeling and Assimilation Series, M. Suarez, Ed. NASA Tech. Memo. 2002-14606, Vol. 22, 33 pp. Gregg, W. W. 2006: Assimilation of SeaWiFS ocean chlorophyll data into a three-dimensional global ocean model (PDF). Journal of Marine Systems, accepted. Gregg, W. W. and N. W. Casey, 2006: Modeling Coccolithophores in the Global Oceans (PDF). Deep-Sea Research II, in press. |
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