1 1 Jon Albretsen, Anne D. Sandvik and Lars Asplin NorKyst-800: A high-resolution coastal ocean circulation model for Norway St Augustine, Florida, 7-9.

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1 1 Jon Albretsen, Anne D. Sandvik and Lars Asplin NorKyst-800: A high-resolution coastal ocean circulation model for Norway St Augustine, Florida, 7-9 November 2011 ECM12 Twelth International Conference on Estuarine and Coastal Modeling

2 2 Content What is NorKyst-800 and why is it established? Short about the model system components How does NorKyst-800 perform? Summary

3 3 What is NorKyst-800? A numerical ocean modeling system suitable for reproduction of physical variables as sea level, temperature, salinity and currents for all coastal areas in Norway and adjacent seas. The NorKyst-800 model system can easily be defined to simulate an arbitrary part or potentially the entire Norwegian coast. Initiated by the Institute of Marine Research (IMR), the Norwegian Meteorological Institute (met.no) and the Norwegian Institute for Water Research (NIVA).

4 4 Main motivation for establishing NorKyst-800  Is capable of providing information on the physical environment with relatively high resolution along the Norwegian coast from the Swedish border to Russia.  The NorKyst-800 results will provide important information for coastal- and fjord related issues, as e.g. shipwrecks, oil spills and algae blooms, or simply for understanding of ocean variability.  The model intends to be a central part of the national rescue services where both IMR and met.no are obligated to deliver scientific advices related to accidents.  Other useful applications are input to particle tracking models for pollution or growth and dispersion of biological material such as salmon lice or egg and larvae from coastal cod populations.  By providing initial fields and boundary conditions, NorKyst-800 is also a necessary step in numerical modelling with even higher resolution for Norwegian fjords.  Archives with observations are built simultaneously for easier access regarding model validation.

5 5 Model area

6 6 Selection of model area (i0,j0) = (1,1) (i1,j1) = (850,893)

7 7 User interface DescriptionValue (defaults) Positions defining the model area based on a sub grid of the entire NorKyst-800 domain (i0,i1) and (j0,j1) where (i1,j1) is maximum (2600,900) Simulation periodt0 and t1 define start and end date, respectively No. of tiles in both directionsNtileI=12, NtileJ=12 No. of vertical levels35 Parameters for configuration of vertical levels and grid resolution S-coor. surface control param. (theta s)8.0 S-coor. bottom control param. (theta b)0.1 Width of surf/bott boundary (Tcline)10 (m) Internal (baroclinic) time step (s)60 No. of hours between output of results1 (stations) / 1 (inst) / 24 (avg) Data sources for nesting-fieldsMETNO4KM, ROMS4KM or MONCLI4KM Data sources for atm. forcing fieldsMETNO10KM, ERAINT

8 8 Archive: nesting conditions 3D-fields of surface height, hydrography and currents (daily means) Optional archives in NorKyst-800:  ROMS4KM: Nordic Seas, 1989 – 2008  METNO4KM: met.no operational, Nordic seas, 2008 – present  MONCLI4KM: Monthly climatology based on ROMS4KM  Upcoming: ROMS 4KM hindcast, Nordic Seas, METNO4KM

9 9 Archive: atmospheric forcing Surface fields of mslp, wind, temperature, specific humidity and fields of total cloud cover and precipitation Optional archives in NorKyst-800:  ERAINT: ECMWF re-analysis, 0.7 o x 0.7 o, > present  METNO10KM: Hirlam 10km hindcast, 1958 – 2009  Operational model fields from met.no: Hirlam 8km, UM 4km METNO10KM

10 Archive: river runoff  Based on modelled (HBV) discharge from the 247 main Norwegian catchment areas that drain to the sea  The HBV-model is a conceptual rainfall-runoff model including snow accumulating and melting, soil moisture accounting with hydrological response and river routing  Provided by the Norwegian Water Resources and Energy Directorate (NVE)  Daily values, valid from 1962 – present (provided with a 1/2 year time lag)  The discharge is distributed linearly from the surface down to a prescribed depth for each river

11 Archive: tidal forcing  Based on the global inverse barotropic model of ocean tides, TPXO7.2 (hor. res. of 0.25 o )  Amplitude and phase for sea surface elevation and currents for eight primary harmonic constituents (M2, S2, N2, K1, K2, O1, P1, Q1) of diurnal and semidiurnal frequencies Co-tidal range (colors, 0.1m) and co-tidal lines (white lines, 1h) interpolated from the TPXO database to the entire NorKyst-800 grid

12 Ocean model: ROMS The Regional Ocean Modeling System ( is used in the NorKyst-800 model system and is a 3D free- surface, hydrostatic, primitive equation ocean model using terrain-following s-coordinates in the vertical. Sea ice is included. The NorKyst-800 system is not bound to keep ROMS as the solver of the primitive equations, but we are very satisfied with its behavior from several validation experiments.

13 NorKyst-800: Performance Currents, 10m depth, average, 3 sub-areas merged

14 NorKyst-800: Performance Surface salinity, animation, May 1-31, 2009, daily averages

15 Validation, sea level

16 Validation, currents, offshore Courtesy: Statoil and met.no (Lofoten-Vesterålen Currents)

17 Validation, currents, inshore NorKyst-800, 3.5 months Hardanger-200m, 1 month

18 Validation, hydrography All fixed stations

19 Validation, hydrography The Skagerrak transect (Mar-Dec, 2009) NorKyst-800 Measurements

20 Summary NorKyst-800 is established to provide information on the physical environment with relatively high resolution along the Norwegian coast (for oil spills, man-over-board, algae blooms, input to salmon lice/cod egg tracking models, input to fjord models etc. NorKyst-800 contains an ocean model (ROMS), several data bases with external forcing for both hindcast and forecast simulations and scripts/programs to have the forcing easily arranged. NorKyst-800 is run by several users and validated towards an increasing number of observations. NorKyst-800 behaves satisfactorily off- and onshore, but most Norwegian fjords need a higher resolution model to resolve their dynamics properly.