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What are the major differences between GOFS 3.1 and GOFS 3.0? Print

Global Ocean Forecasting System (GOFS)

GOFS 3.1 GOFS 3.0
HYCOM source code 2.2.99DHMTi 2.2.19
Equation of state 17-term 7-term
Layers 41, nine additional layers near the surface, top 14 layers are always sigma-z so that water shallower than 84 m is always in fixed coordinates 32
Surface wind forcing Reads in 10 m wind velocities and calculates wind stress using HYCOM SST and also taking into account HYCOM surface currents Reads in wind stress that is calculated off-line using bulk parameterization
Surface radiation forcing Uses downward shortwave and longwave radiation Uses net shortwave and longwave radiation
Ocean turbidity Based on monthly chlorophyll climatology Based on photosynthetically available radiation
Initialization From GDEM4 climatology From Polar Science Center Hydrography
SSS relaxation Weaker in GOFS 3.1 and turned off completely when HYCOM SSS is more than 0.5 psu away from climatology Stronger than GOFS 3.1
Ice model Full two-way coupling with the Community Ice CodE (CICE) Energy-loan ice model
Downward projection ISOP MODAS

For more detailed information, see the GOFS 3.1 Validation Test Report.