Thermohaline Circulation in Thermohaline Circulation in the Coupled GISS/HYCOM the Coupled GISS/HYCOM Climate Simulation Climate Simulation Shan Sun Shan Sun NASA/GISS NASA/GISS Rainer Bleck Rainer Bleck Los Alamos National Laboratory Los Alamos National Laboratory
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Thermohaline Circulation in the Coupled GISS/HYCOM Climate Simulation Shan Sun NASA/GISS Rainer Bleck Los Alamos National Laboratory.
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Thermohaline Circulation in the Coupled Thermohaline Circulation in the Coupled GISS/HYCOM Climate SimulationGISS/HYCOM Climate Simulation
Shan SunShan SunNASA/GISS NASA/GISS
Rainer BleckRainer BleckLos Alamos National LaboratoryLos Alamos National Laboratory
HYCOM: Bleck (2002), with a less diffusive HYCOM: Bleck (2002), with a less diffusive grid generator, 16 layers, 2xcos(lat) grid generator, 16 layers, 2xcos(lat) resolutionresolution
Ice model: thermodynamics (Russell et al., Ice model: thermodynamics (Russell et al., 2000) and Hibler dynamics (Zhang and 2000) and Hibler dynamics (Zhang and Rothrock, 2000)Rothrock, 2000)
Model ExperimentsModel ExperimentsControl A: 500 year runControl A: 500 year run
Control B: as Control A, but usingControl B: as Control A, but using
spiciness in place of salinity during advectionspiciness in place of salinity during advection
1% CO1% CO2 2 rise per year up to doublingrise per year up to doubling
Con
trol
A
Con
trol
A
Control A
Control A
Control B
2 x CO2
SST and its Drift
Net Heatflux at the Surface (W/m2)
Precipitation (mm/day)
SummarySummary
The density/spiciness advection appears to be The density/spiciness advection appears to be beneficial to coupled GISS/HYCOM model beneficial to coupled GISS/HYCOM model simulationssimulations
Atlantic thermohaline circulation under the global Atlantic thermohaline circulation under the global warming scenario is no longer stable as seen in warming scenario is no longer stable as seen in previous version of GISS/HYCOM (Sun and Bleck previous version of GISS/HYCOM (Sun and Bleck 2002)2002)
The climate sensitivity to surface mixing schemes The climate sensitivity to surface mixing schemes needs to be further examinedneeds to be further examined
The double ITCZ seems to be related to the cold The double ITCZ seems to be related to the cold bias along the equatorial Pacificbias along the equatorial Pacific