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H compset experiments

H compset experiments. Robert Osinski , Wieslaw Maslowski, Jaromir Jakacki , Jackie Clemant -Kinney, Andrew Roberts RASM workshop, NPS, May 2012. Channel problem. Volume transport through the channel. Scalability of H compset. Timing profile. Experiments H_NC2_AL0_ST0_CP0_D0_T0.

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H compset experiments

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  1. Hcompset experiments Robert Osinski, Wieslaw Maslowski, JaromirJakacki, 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. 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

  7. 30-year long runs. 1978-2007Five 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 AL1All default values; albedo type= constant; albedotype = default(ahmax = 0.5m)

  9. AL0 and AL1All default values; albedo type= constant; albedotype = default(ahmax = 0.5m)

  10. AL1 and AL2 albedotype = default(ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ; shortwave='dEdd’

  11. AL1 and AL2albedotype = default(ahmax = 0.5m); Albedo type = default (ahmax = 0.5m) ; shortwave='dEdd’

  12. AL3Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ;Cf=5.6

  13. AL0,AL1 and AL4albedo type= constant; albedotype = default(ahmax = 0.5m);Albedo type = default (ahmax = 0.1m) ; shortwave='default’, Cf=5.6

  14. Al1 and AL4albedotype = default(ahmax = 0.5m);Albedo type = default (ahmax = 0.1m) ; shortwave='default’, Cf=5.6

  15. 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-Eddingtonshortwave.

  16. 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.

  17. AL3Albedo type = default (ahmax = 0.3m) - albedo is constant above this thickness ; shortwave='dEdd’; Cf=5.6

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