1. H compset experiments Robert Osinski, Wieslaw Maslowski, Jaromir Jakacki, Jackie Clemant- Kinney, Andrew Roberts RASM workshop, NPS, May 2012

2. Channel problem

3. Volume transport through the channel

4. Scalability of H compset

5. Timing profile

6. Experiments H_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

7. 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

8. AL0 and AL1 All default values; albedo type= constant; albedo type = default (ahmax = 0.5m)

14. AL1 and AL2 albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ; shortwave='dEdd

15. AL1 and AL2 albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ; shortwave='dEdd

16. AL3 Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ; Cf=5.6

17. AL0, AL1 and AL4 albedo type= constant; albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.1m) ; shortwave='default, Cf=5.6

18. Al1 and AL4 albedo type = default (ahmax = 0.5m); Albedo type = default (ahmax = 0.1m) ; shortwave='default, Cf=5.6

19. Some conclusions Default 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.

20. 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.

22. AL3 Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ; shortwave='dEdd; Cf=5.6