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Trans-boundary nutrient transport in the North Sea using POLCOMS-ERSEM

Trans-boundary nutrient transport in the North Sea using POLCOMS-ERSEM. Sarah Wakelin (POL) Jason Holt (POL) Roger Proctor + ERSEM development from PML. Overview. POLCOMS-ERSEM The Atlantic Margin implementation for trans-boundary nutrient calculations Validation

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Trans-boundary nutrient transport in the North Sea using POLCOMS-ERSEM

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  1. Trans-boundary nutrient transport in the North Sea using POLCOMS-ERSEM Sarah Wakelin (POL) Jason Holt (POL) Roger Proctor + ERSEM development from PML

  2. Overview • POLCOMS-ERSEM • The Atlantic Margin implementation for trans-boundary nutrient calculations • Validation • Transboundary nutrient transports

  3. POLCOMS • 3D baroclinic B-grid model • primitive equation • finite differences • spherical polar grid with vertical s-coordinate

  4. POLCOM Model Domains Atlantic Margin 1/6ox1/9o Medium resolution continental shelf 1/10ox1/15o High resolution continental shelf 1/40ox1/60o S. North Sea 1/40ox1/60o Liverpool Bay 1/400ox1/600o Irish Sea 1/40ox1/60o GCOMS – Global Coastal Ocean Modelling

  5. ERSEM

  6. Using Ocean Colour EO to improve the model • Focuses on a problem area (SPM modelling difficult, CDOM modelling not well established) • Use ocean colour products to estimate SPM+CDOM • Constrain light field • Avoids complex dependencies within the model • Simple to implement

  7. An (simple) assimilative attenuation model Diffuse attenuation of PAR: pure water SeaWiFs (non-biotic) model • A variable for non-biotic absorption is: • Advected-diffused (to give memory) • Relaxed to surface observations throughout the depth log10(m-1) Non-biotic absorption 8-day mean (May)

  8. Ocean-shelf tracer exchange

  9. The Atlantic Margin Model (AMM) simulation • ~12 km resolution, 42 vertical s-levels • 1996 spinup using initial condition from model run starting in 1960 • 6 year run (1997-2002) • ERA40 + operational ECMWF surface forcing • 249 river flows • nitrate • ammonium • silicate • phosphate • 15 tidal constituents • Ocean boundaries from global implementation of ORCA (Smith and Haines, 2009) • EO SPM/CDOM attenuation – mean annual cycle

  10. Temperature sections

  11. Salinity sections

  12. Surface temperature • Pathfinder AVHRR sea surface temperature 9km-resolution data

  13. Surface salinity winter 2002 summer 2002

  14. Surface currents annual mean surface current 2002 (m/s) Turrell (1992)

  15. Net Primary Production Net primary production 2002 (gC m-2yr-1) Obs: Joint and Pomeroy (1993) SeaWiFS in the Celtic Sea for 2002 265±26 gC m-2yr-1 (T. Smyth)

  16. Ecosystem validation correlation coefficients

  17. Boundary fluxes – UK *

  18. Boundary fluxes – France *

  19. Boundary fluxes – Belgium *

  20. Boundary fluxes – Netherlands *

  21. Boundary fluxes – Germany *

  22. Boundary fluxes – Denmark *

  23. Boundary fluxes – Norway *

  24. Boundary fluxes – FC2 *

  25. Boundary fluxes – BC *

  26. Boundary fluxes – NLC2 *

  27. Boundary fluxes – NLC3 *

  28. Boundary fluxes – GC1 *

  29. Boundary fluxes – NLO2 *

  30. Boundary fluxes – GO2 *

  31. Volume change (×1012 m3)

  32. Change in total N (×109 mol)

  33. Total boundary flux changes in phytoplankton (×109 gC)

  34. Proudman Oceanographic LaboratoryJoseph Proudman Building6 Brownlow Street, Liverpool L3 5DA UKslwa@pol.ac.uk

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