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Ocean Biogeochemical Model Development Team (OBMDT)

The Ocean Biogeochemical Model Development Team (OBMDT) is charged with developing state-of-the-art ocean biogeochemical tracer models for implementation in GFDL's general circulation models, including the Modular Ocean Model Version 4 (MOM4) and the Hallberg Isopycnal Model (HIM) and adaptation for Earth System Model simulations. This effort utilizes the many resources available at Princeton University and elsewhere for ocean biogeochemical modeling. For an introduction of OBMDT, view our mission statement .

Tools	Membership
An extensive MOM4 guide is available for general reference. Below are some additional tools intended for remedial computing and specific tracer applications: MOM4 recipe - A preliminariy release of the ocean tracer infrastructure is available in a basic HOWTO run tracer that describes the step-by-step process of running examples of tracer simulations utilizing the powerful XML makefile- and runscript- generator. Troubleshooting - A troubleshooting guide is available to help solve problems with runscripts. Totalview guide - A Totalview guide is availabe to get users running the Totalview Debugger - a powerful means of troubleshooting both codes and runscripts. Preprocessing - A guide for preprocessing files into the correct netCDF format on a given model grid describes some of the available ways to regrid tracer fields for model initial and boundary conditions. Adding tracers - A model development guide for adding a tracer is availabe. This provides a step-by-step example of how to add a biogeochemical tracer to MOM4 (silicate in this case).	The OBMDT Team uses the mailing list oar.gfdl.obmdt@majordomo.gfdl.noaa.gov. You can browse the Mailing List Archive or view the Distribution List, where you can also subscribe or unsubscribe from the list. The OBMDT is headed by John Dunne.
	Meeting Summaries
	Feb 11, 2004 (Update on OM1, OM1p5 and biogeochemical module development) Dec 17, 2003 (Update on OM1p5 development) Dec 3, 2003 (Preliminary status of OM1p5) Oct 29, 2003 (Introduction and discussion of OM1p5) Sep 17, 2003 (Release of Tracer code) Jun, 5 2003 (Ocean Biogeochemistry Roadmap)

Model Descriptions

OCMIP2 Biotic

Includes ocmip2 biotic suite of biogeochemical tracers (DIC, ALK, PO4, DOP, O2) forced with surface restoring of PO4 to an observed climatology. Specifically, the model takes climatological fields from the World Ocean Atlas 2001 (PO4) and the Carbon Dioxide Information Analysis Center (DIC and ALK) databases and rescales them to follow OCMIP2 protocols, which are strictly adhered to.

Restoring Biogeochemistry

Includes an extended suite of biogeochemical tracers (DIC, ALK, NO3, NH4, PO4, SiO4, ALK, Fed, DON, DOP, LDOC, O2) forced with surface restoring of PO4, NO3 and SiO4 to the observed monthly climatology from the World Ocean Atlas 2001 (NO3, PO4, SiO4) and the Carbon Dioxide Information Analysis Center (DIC, ALK) databases and a surface Fed climatology of J. Dunne after Johnson and Archer (1997). Food web processing in the euphotic zone and remineralization/dissoltion through the ocean interior are handled as in Dunne et al. (in prep). The model includes a treatment of nitrogen fixation/denitrification. Carbon dioxide equilibria and gas exchange follow OCMIP2 protocols.

Phytoplankton Biogeochemistry

Includes an explicit ecological model of phytoplankton growth and loss (NSm, NLg, NDi, FeSm, FeLg, FeDi, SiLg) atop the extended suite of biogeochemical tracers (DIC, ALK, NO3, NH4, PO4, SiO4, ALK, Fed, DON, DOP, LDOC, O2). The model takes initial climatological fields from the World Ocean Atlas 2001 (NO3, PO4, SiO4) and the Carbon Dioxide Information Analysis Center (DIC, ALK) databases. Food web processing in the euphotic zone and remineralization/dissolution through the ocean interior are handled as in Dunne et al. (in prep). The model includes a treatment of nitrogen fixation/denitrification. Carbon dioxide equilibria and gas exchange follow OCMIP2 protocols.

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Geophysical Fluid Dynamics Laboratory

Ocean Biogeochemical Model Development Team (OBMDT)

Geophysical Fluid
Dynamics Laboratory