h compset experiments robert osinski, wieslaw maslowski, jaromir jakacki, jackie clemant- kinney,...
TRANSCRIPT
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H compset experiments
Robert Osinski, Wieslaw Maslowski, Jaromir Jakacki, Jackie Clemant-Kinney, Andrew Roberts
RASM workshop, NPS, May 2012
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Channel problem
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Volume transport through the
channel
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Scalability of H compset
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Timing profile
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ExperimentsH_NC2_AL0_ST0_CP0_D0_T0
Inter-annually varying forcing (IAF), as developed by Large and Yeager (2008) at NCAR: CORE2
Ice albedo
Ice mechanical redistribution (sea ice strength)
Coupling – especially how the momentum flux is transfer from atmosphere to the sea ice
Ocean dynamics
Time steps in both ice and ocean models
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30-year long runs. 1978-2007
Five 30-year tests are finished and another three are currently running.H_NC2_AL0_ST0_CP0_D0_T0 – Control run
All default values; albedo type= constant
H_NC2_AL1_ST0_CP0_D0_T0
Albedo type = default (ahmax = 0.5m) - albedo is constant above this thickness
H_NC2_AL2_ST0_CP0_D0_T0
Albedo type = default (ahmax = 0.5m) - albedo is constant above this thickness ; shortwave='dEdd’
H_NC2_AL3_ST1_CP0_D0_T0
Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ; Cf=5.6
H_NC2_AL4_ST1_CP0_D0_T0
Albedo type = default (ahmax = 0.1m) - albedo is constant above this thickness ; shortwave=’default’; Cf=5.6
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AL0 and AL1All default values; albedo type= constant; albedo type = default (ahmax = 0.5m)
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AL0 and AL1All default values; albedo type= constant; albedo type = default (ahmax = 0.5m)
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AL1 and AL2albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ;
shortwave='dEdd’
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AL1 and AL2albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ;
shortwave='dEdd’
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AL3Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ; Cf=5.6
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AL0, AL1 and AL4albedo type= constant; albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax =
0.1m) ; shortwave='default’, Cf=5.6
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Al1 and AL4albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.1m) ;
shortwave='default’, Cf=5.6
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Some conclusionsDefault values of the model settings give not enough sea ice in the results.
2007 ice extent minima was reproduced correctly with H_NC2_AL1_ST0_CP0_D0_T0 experiment.
We still have not get the proper sea ice thickness distribution.
The default ahmax=0.5 m is probably too high; some more tests are needed e.g. with R_ice : tuning parameter for sea ice albedo from Delta-Eddington shortwave.
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Plan for the next six months:
Include the volume transport from Atlantic to Pacific side in fully coupled case.
Include and test 2km resolution version of the RASM with at least H comset.
Performed more tuning tests to get acceptable results.
Compare tuning results with measurement at least with RGPS measurements.
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AL3Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ;
shortwave='dEdd’; Cf=5.6