1. Validation of ORCA05 regional configuration of the Arctic North Atlantic Christophe HERBAUT and Marie-Noëlle HOUSSAIS Charles DELTEL LOCEAN, Université Paris VI / CNRS

2. Arctic-North Atlantic ice-ocean model ORCALIM model Model domain : 30°S in the Atlantic to ~50°N in the Pacific Resolution :0.5°cos(latitude) ~25 km Open BC prescribed from the global ORCA05 version with radiating conditions Control experiment : Daily atmospheric surface fields : Downward SW and LW, SAT, SLP,SAT, Tdew, U 10 and  from ERA40 reanalysis (1958-2001). Monthly precipitation. Correction on SAT in the Arctic (IABP/POLES) and radiation outside the Arctic(ISCCP) Climatological run-off from ArcticNet Relaxation to climatological SST and SSS at the surface

3. Ocean circulation at 20 m 2000 m Model climatology Greenland Scotland Ridge transports : Atlantic Water : IFR : 5 Sv (net) FSC : 1.5 Sv DS : 1 Sv Dense outflow : FSC ~ 2.5 Sv DS ~ 3 Sv

4. OBSERVATIONS ORCA05 WINTER (JFM) ICE DRIFT ORCA025

5. WINTER (JFM) ICE DRIFT OBSERVATIONS ORCA05 ORCA025

6. OBSERVATIONS (times 2) WINTER (JFM) ICE SPEED ORCA05 ORCA025

7. OBSERVATIONSORCA05ORCA025OBSERVATIONS WINTER (JFM) ICE SPEED

8. SSM/I radiometer APRIL SEA ICE FRACTION ORCA05ORCA025

9. SSM/I OBSERVATIONS SEPTEMBER SEA ICE CONCENTRATION ORCA05 ORCA025

10. SSM/I OBSERVATIONS SEPTEMBER SEA ICE CONCENTRATION ORCA05 ORCA025

11. Ice ExtentIce area - SSM/I - ORCA05 - ORCA025 ARCTIC SEA ICE COVERAGE

12. ARCTIC MEAN ICE THICKNESS ORCA05 ORCA025 Model intercomparison Rothrock et al. 2003 -> Maxima of ice thickness in mid 60’s, late 70’s and late 80’s

13. FRAM STRAIT ICE VOLUME TRANSPORT Area flux ORCA05 ORCA025 Observational estimate Vinje, 2001 - Observations (Kwok and Rothrock, 1999) - ORCA05

14. Correlation PC1 with AO Leading eof of mean annual sea ice fraction ORCA05 Observations Singarayer and Bamber (2003)

15. EOF’s of the mean sea ice thickness 1958-2001 ORCA05 ORCA025

16. ORCA05