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Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde

Trying to model Greenland’s fjords with GETM. Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde hans.burchard@io-warnemuende.de. Aspects of fjord -type estuarine circulation. Exchange flow. Inflows. Boundary and internal mixing. Reissmann et al., 2009.

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Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde

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  1. Trying to model Greenland’s fjords with GETM Hans Burchard Leibniz Institute for Baltic Sea Research Warnemünde hans.burchard@io-warnemuende.de

  2. Aspectsoffjord-type estuarinecirculation Exchange flow Inflows Boundaryand internalmixing Reissmann et al., 2009

  3. www.getm.eu

  4. Coupledcoastaloceanmodellingwith GETM

  5. Domain decomposition Gräwe et al. (in prep.)

  6. Example for simulated summer sea surface temperature Gräwe et al. (in prep.)

  7. Example for simulated bottom salinity Gräwe et al. (in prep.)

  8. Adaptive coordinates in Bornholm Sea

  9. 1 nm Baltic Sea model with adaptive coordinates - refinement partially towards isopycnal coordinates - reduced numerical mixing - reduced pressure gradient errors - still allowing flow along the bottom Observations November 2003 salinity Feistel et al., 2004 temperature km Hofmeisteret al. (2011)

  10. IdeasaboutIOW‘scontributionto Green-Rise IOW‘staskbasicallyistoprovide a cheap (and simple ?) parameterisedfjordmodelwhichcanbe incorporated intoclimatemodels. About 150 fjordshavetobesimulatedindividually. On the ocean side these simplified fjords are driven by a large-scale ocean circulation model. On the glacier side fjords interact with glacier heads (melting). Wind forcing seems to be important for the exchange between fjord and shelf. Sermilik fjord (without sill, SE Greenland) will be used for high-resolution reference modelling. Probably, also a classical sill fjord and a fjord with an ice shelf should be added for reference simulations.

  11. Sketch offjordmodel design (fromproposal)

  12. Short discussion on Sermilikfjordissues Itisthe plan toreproduceone real year‘scirculation in high resolutionwith GETM. Problems: bathymetrypartiallyunknown; sidewallspartiallyverysteep. Straneo et al. (2010)

  13. HydrographyofSermilikfjord July September Straneo et al. (2010)

  14. Idealised 2DV modelofSermilikfjord Sciascia et al. (2013)

  15. Idealised 2DV modelofSermilikfjord Qsg=0.74 m3/s Qsg=5.8 m3/s Qsg=8.7 m3/s Sciascia et al. (2013)

  16. Idealised 2DV modelofSermilikfjord Salinityanomalyandcirculation (summer) Summer (gray) andwinter (black) melt rate Sciascia et al. (2013)

  17. Lab experimentsfor submarine melting (courtesy Claudia Cenedese, WHOI) smalldischarge large discharge

  18. Issuesaboutparameterisedfjordmodels Howcomplexshouldthesefjordmodelsbe? Two-layer longitudinal? Multi-layer longitudinal? Or simpler? Ormorecomplex? Whatarethecomputing time constraints? Howtoreproduce 150 fjordsindividually? Howshouldthecouplinginto a climatemodelbemadetechnically? Via an Earth systemcoupler? As partof an existingmodule? Shouldonefirstbuild a toycoupledmodel? Howshouldtheforcingbe on theoceanside? Whatisthespatial / temporal / processresolutionoftheoceanmodel? Wind forcing? Howshouldthefjordmodelinteractwiththe glacier model? Howdoesactually submarine glacialmeltincreaseiceexporttotheocean? Howtoincorporatethisintothecoupledmodelsystem?

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