Validation of an Arctic/North Atlantic model system. Kristine S. Madsen, Till A.S. Rasmussen, Mads H. Ribergaard Danish Meteorological Institute
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1 Validation of an Arctic/North Atlantic model system Kristine S. Madsen, Till A.S. Rasmussen, Mads H. Ribergaard Danish Meteorological Institute
2 Ocean modelling at DMI Operational modelling and hindcasts Arctic and Atlantic, including nestings: HYCOM- CICE European shelf seas: HBM Climate research with coupled modelling Global: EC-Earth with NEMO Regional: HYCOM-CICE and HBM coupled with HIRHAM5 atmospheric climate model All models are also used for process studies
3 Ocean modelling at DMI Operational modelling and hindcasts Arctic and Atlantic, including nestings: HYCOM- CICE European shelf seas: HBM Climate research with coupled modelling Global: EC-Earth with NEMO Regional: HYCOM-CICE and HBM coupled with HIRHAM5 atmospheric climate model All models are also used for process studies
4 Ocean modelling at DMI Operational modelling and hindcasts Arctic and Atlantic, including nestings: HYCOM- CICE European shelf seas: HBM Climate research with coupled modelling Global: EC-Earth with NEMO Regional: HYCOM-CICE and HBM coupled with HIRHAM5 atmospheric climate model All models are also used for process studies
5 Ocean modelling at DMI Operational modelling and hindcasts Arctic and Atlantic, including nestings: HYCOM- CICE European shelf seas: HBM Climate research with coupled modelling Global: EC-Earth with NEMO Regional: HYCOM-CICE and HBM coupled with HIRHAM5 atmospheric climate model All models are also used for process studies
6 HYCOM Setup Modelled ice cover and sea surface temperature, July The black area indicates the area where we presently make operational oil spill simulations. HYCOM ocean model ~10 km horizontal resolution for the Arctic and the Atlantic to ~20 S 40 vertical levels (hybrid) Forcing ECMWF atmosphere (Deterministic forecast or ERA-Interim) with possibility for nested high-res data Open boundaries: Tides and climatological temperature and salinity Body tides Rivers from monthly climatology Presently 144h forecast twice a day. Can be extended Possible to set up finer scale areas
7 Sea ice model The elastic-viscous-plastic dynamic and thermodynamic sea-ice (CICE) model version ice thickness categories with 4 vertical layers for each, plus surface snow Ice velocities differ significant from ocean surface currents Simulates major ridges and cracks HYCOM and CICE are coupled using the ESMF coupler
8 Assimilation Presently, we nudge towards sea ice concentrations, SST and SSS with 10, 30 and 30 days relaxation time, respectively Sea ice concentration: OSISAF SST: GHRSST Level 4 DMI_OI global product (before 2011: OSTIA) SSS: climatology (combined WOA and PHC) Sea ice concentration: SST: ocean.dmi.dk/satellite/index.uk.php, data through PO.DAAC
9 Simulation history Spin-up ERA-Interim Hindcast ERA-Interim Operational 2014-present ECMWF deterministic forecast
10 Simulation history Spin-up ERA-Interim Hindcast ERA-Interim Operational 2014-present ECMWF deterministic forecast
11 Modelled sea ice thickness and SST 2013 Observed sea ice extent
12 Total extent and volume Modelled Extent [10 6 km 2 ] Observed Volume [10 3 km 3 ]
13 Example of sea ice concentration modelling Model June 25 Ice chart June 22
14 Cape Farewell sea ice index Modelled Observed No sea ice Sea ice at Cape Farewell Sea ice fills Julianehaab Bight
15 Ocean validation at Fylla Bank Introduction
16 Ocean validation at Fylla Bank Historical summertime observations Surface salinity Surface temperature
17 Ocean validation at Fylla Bank Year-round model results Salinity Temperature
![[m]](/docs-images/84/90688727/images/18-2.jpg)
18 Tides M2 amplitude [m]
19 Summary 10 year hindcast simulation with coupled HYCOM- CICE model and ERA-Interim forcing SST signatures of mayor ocean currents in place Sea ice thickness reasonable Interannual variability of sea ice at Cape Farewell captured Pulsating interplay between water masses at Fylla Bank Tidal pattern in place, but amplitudes are low Reference: Madsen, Rasmussen, Ribergaard and Ringgaard, Polarforschung (submitted).
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