alternative ocean and ice initial conditions for the ccsm
Post on 31-Dec-2015
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Alternative Ocean and Ice Initial Conditions for the CCSM
Can simple initial conditions be used?How does the spin-up change?
Initial Conditions
Ocean
Ice
CCSM
OZM/IM
OZM/I0
January-Mean Levitus/Poles
Mysterious
Zonal- and Time-Mean Levitus/Poles
Mysterious
Zonal- and Time-Mean Levitus/Poles
Zero
“…. We now try to address why the CSM1 has achieved this success. We believe there is a two-part answer: the first is the state-of-the-art component models, and the second is the spin-up procedure used. ….” Boville and Gent (1998)
CSM1
1000y
50y
150y
NH Ice Volume, Snow Volume, and Ice Area
OZM/IM OZM/IMCCSM
OZM/I0
Sea Surface Temperature
OZM/IM - CCSM OZM/IM – OZM/I0
CCSMOZM/IM
Arctic Sea Surface Salinity
OZM/IM - CCSM OZM/IM – OZM/I0
CCSMCCSM
OZM/IM
Sea Surface Height
OZM/IM - CCSM OZM/IM – OZM/I0
OZM/IM
Ice Volume, Snow Volume, and Ice Area
OZM/I0 CCSM
NH SH
SH Ice Area SH Ice Thickness
OZM/I0 OZM/I0CCSM
CCSM
OZM/I0 - CCSM OZM/I0 - CCSM
Global-mean Potential Temp
ACC Transport
Ocean Time Series
OZM/I0CCSM
OZM/I0 - CCSM OZM/I0 - CCSM
CCSM OZM/I0
Sea Surface Temperature
CCSM OZM/I0
Salinity at 100m
Barotropic StreamfunctionCCSM OZM/I0
OZM/I0 - CCSM
CONCLUSIONS
• Simple initial conditions can be used
• Ice model spin-up is similar
• Ocean has to go through its time scales
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