期刊
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
卷 5, 期 2, 页码 422-446出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/jame.20023
关键词
ocean modeling; Earth system models; ocean circulation
资金
- Federal Ministry for Education and Research in Germany (BMBF)
- BMBF research program MiKlip [FKZ: 01LP1158A]
- BMBF research program Nordatlantik [FKZ: 03F0605D/E]
- Cluster of Excellence CLISAP at Hamburg University
- German Science Foundation (DFG)
MPI-ESM is a new version of the global Earth system model developed at the Max Planck Institute for Meteorology. This paper describes the ocean state and circulation as well as basic aspects of variability in simulations contributing to the fifth phase of the Coupled Model Intercomparison Project (CMIP5). The performance of the ocean/sea-ice model MPIOM, coupled to a new version of the atmosphere model ECHAM6 and modules for land surface and ocean biogeochemistry, is assessed for two model versions with different grid resolution in the ocean. The low-resolution configuration has a nominal resolution of 1.5(degrees), whereas the higher resolution version features a quasiuniform, eddy-permitting global resolution of 0.4(degrees). The paper focuses on important oceanic features, such as surface temperature and salinity, water mass distribution, large-scale circulation, and heat and freshwater transports. In general, these integral quantities are simulated well in comparison with observational estimates, and improvements in comparison with the predecessor system are documented; for example, for tropical variability and sea ice representation. Introducing an eddy-permitting grid configuration in the ocean leads to improvements, in particular, in the representation of interior water mass properties in the Atlantic and in the representation of important ocean currents, such as the Agulhas and Equatorial current systems. In general, however, there are more similarities than differences between the two grid configurations, and several shortcomings, known from earlier versions of the coupled model, prevail.
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