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Validation of ORCA05 regional configuration of the Arctic North Atlantic

Validation of ORCA05 regional configuration of the Arctic North Atlantic. Christophe HERBAUT and Marie-Noëlle HOUSSAIS Charles DELTEL LOCEAN, Université Paris VI / CNRS. Arctic-North Atlantic ice-ocean model. ORCALIM model Model domain : 30°S in the Atlantic to ~50°N in the Pacific

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Validation of ORCA05 regional configuration of the Arctic North Atlantic

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  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, U10 and t 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. Model climatology Ocean circulation at 20 m 2000 m • 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. WINTER (JFM) ICE DRIFT OBSERVATIONS ORCA05 ORCA025

  5. WINTER (JFM) ICE DRIFT OBSERVATIONS ORCA025 ORCA05

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

  7. WINTER (JFM) ICE SPEED ORCA05 OBSERVATIONS OBSERVATIONS ORCA025

  8. APRIL SEA ICE FRACTION SSM/I radiometer ORCA05 ORCA025

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

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

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

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

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

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

  16. ORCA05 ORCA025

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