학술논문
The GFDL Global Ocean and Sea Ice Model OM4.0: Model Description and Simulation Features
Document Type
article
Author
Alistair Adcroft; Whit Anderson; V. Balaji; Chris Blanton; Mitchell Bushuk; Carolina O. Dufour; John P. Dunne; Stephen M. Griffies; Robert Hallberg; Matthew J. Harrison; Isaac M. Held; Malte F. Jansen; Jasmin G. John; John P. Krasting; Amy R. Langenhorst; Sonya Legg; Zhi Liang; Colleen McHugh; Aparna Radhakrishnan; Brandon G. Reichl; Tony Rosati; Bonita L. Samuels; Andrew Shao; Ronald Stouffer; Michael Winton; Andrew T. Wittenberg; Baoqiang Xiang; Niki Zadeh; Rong Zhang
Source
Journal of Advances in Modeling Earth Systems, Vol 11, Iss 10, Pp 3167-3211 (2019)
Subject
Language
English
ISSN
1942-2466
Abstract
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.