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

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Presentation transcript:

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 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 ( ). 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

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

OBSERVATIONS ORCA05 WINTER (JFM) ICE DRIFT ORCA025

WINTER (JFM) ICE DRIFT OBSERVATIONS ORCA05 ORCA025

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

OBSERVATIONSORCA05ORCA025OBSERVATIONS WINTER (JFM) ICE SPEED

SSM/I radiometer APRIL SEA ICE FRACTION ORCA05ORCA025

SSM/I OBSERVATIONS SEPTEMBER SEA ICE CONCENTRATION ORCA05 ORCA025

SSM/I OBSERVATIONS SEPTEMBER SEA ICE CONCENTRATION ORCA05 ORCA025

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

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

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

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

EOF’s of the mean sea ice thickness ORCA05 ORCA025

ORCA05