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The GFDL Global Ocean and Sea Ice Model OM4.0: Model Description and Simulation Features.
- Source :
- Journal of Advances in Modeling Earth Systems; Oct2019, Vol. 11 Issue 10, p3167-3211, 45p
- Publication Year :
- 2019
-
Abstract
- We document the configuration and emergent simulation features from the Geophysical Fluid Dynamics Laboratory (GFDL) OM4.0 ocean/sea ice model. OM4 serves as the ocean/sea ice component for the GFDL climate and Earth system models. It is also used for climate science research and is contributing to the Coupled Model Intercomparison Project version 6 Ocean Model Intercomparison Project. The ocean component of OM4 uses version 6 of the Modular Ocean Model and the sea ice component uses version 2 of the Sea Ice Simulator, which have identical horizontal grid layouts (Arakawa C-grid). We follow the Coordinated Ocean-sea ice Reference Experiments protocol to assess simulation quality across a broad suite of climate-relevant features. We present results from two versions differing by horizontal grid spacing and physical parameterizations: OM4p5 has nominal 0.5° spacing and includes mesoscale eddy parameterizations and OM4p25 has nominal 0.25° spacing with no mesoscale eddy parameterization. Modular Ocean Model version 6 makes use of a vertical Lagrangian-remap algorithm that enables general vertical coordinates. We show that use of a hybrid depth-isopycnal coordinate reduces the middepth ocean warming drift commonly found in pure z* vertical coordinate ocean models. To test the need for the mesoscale eddy parameterization used in OM4p5, we examine the results from a simulation that removes the eddy parameterization. The water mass structure and model drift are physically degraded relative to OM4p5, thus supporting the key role for a mesoscale closure at this resolution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19422466
- Volume :
- 11
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of Advances in Modeling Earth Systems
- Publication Type :
- Academic Journal
- Accession number :
- 140753203
- Full Text :
- https://doi.org/10.1029/2019MS001726