Abstract
We discuss the model representation of volume transports through one of the most climate-relevant ocean passages, the Fram Strait. We compare results from a coupled ocean–sea ice model with different resolutions (∼1/12° and ∼1/4°) and measurements from a mooring array along 79° N. The 1/4° model delivers a realistic mean climate state and realistic net volume transports. However, this model fails to reproduce the observed intense barotropic recirculation that reaches far north in Fram Strait. This recirculation is captured in the higher resolution version of the model. Other differences exist in the circulation over the East Greenland Shelf and in the temperature of Atlantic waters in the Fram Strait region as well as in surface heat fluxes. We find that a combination of high-resolution model results and long-term measurements can improve the interpretation of measured and simulated processes and reduce the uncertainties in exchange rates between Arctic and the North Atlantic.
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References
Bacon S, Myers PG, Rudels B, Sutherland DA (2008) Accessing the inaccessible: buoyancy-driven coastal currents on the shelves of Greenland and Eastern Canada. In: Dickson B, Meincke J, Rhines P (eds) Arctic–Subarctic Ocean Fluxes. Springer, Dordrecht, pp 703–719
Beszczynska-Möller A, Fahrbach E (2006) Report with description of array performance: Report with results from sensibility study to instrument reduction. AWI, Bremerhaven, http://web-cms.awi.de/fileadmin/user_upload/Research/Research_Divisions/Climate_Sciences/chiaventone/ASOF/Deliverables/D_6_3.pdf
Bourke RH, Newton JL, Paquette RG, Tunnicliffe MD (1987) Circulation and water masses of the East Greenland shelf. J Geophys Res 92(C7):6729–6740
de Steur L, Hansen E, Gerdes R, Karcher M, Fahrbach E, Holfort J (2009) Freshwater fluxes in the East Greenland Current: a decade of observations. Geophys Res Lett 36:L23611. doi:10.1029/2009GL041278
Döscher R, Redler R (1997) The relative importance of Northern Overflow and subpolar deep convection for the North Atlantic thermohaline circulation. J Phys Oceanogr 27:1894–1902
Drange H, Gerdes R, Gao KM, Kauker F, Bentsen M (2005) Ocean general circulation modelling of the Nordic Seas. In: Drange H, Dokken T, Furevik T, Gerdes R, Berger W (eds) The Nordic Seas: an integrated perspective. AGU, Washington, DC, pp 199–220
Fahrbach E, Meincke J, Østerhus S, Rohardt G, Schauer U, Tverberg V, Verduin J (2001) Direct measurements of volume transports through Fram Strait. Polar Res 20(2):217–224
Falck E, Kattner G, Budéus G (2005) Disappearance of Pacific water in the northwestern Fram Strait. Geophyical Research Letters 32:L14619. doi:10.1029/2005GL023400
Gerdes R, Karcher M, Kauker F, Schauer U (2003) Causes and development of repeated Arctic Ocean warming events. Geophyical Research Letters 30(19):1980. doi:10.1029/2003GL018080
Gerdes R, Hurka J, Karcher M, Kauker F, Köberle C (2005) Simulated history of convection in the Greenland and Labrador seas 1948–2001. In: Drange H, Dokken T, Furevik T, Gerdes R, Berger W (eds) The Nordic Seas: an integrated perspective. AGU, Washington, DC, pp 221–238
Gerdes R, Karcher M, Köberle C, Fieg K (2008) Simulating the long term variability of liquid freshwater export from the Arctic Ocean. In: Dickson B, Meincke J, Rhines P (eds) Arctic–subarctic ocean fluxes. Springer, Dordrecht, pp 405–425
Harder M et al (1998) Simulation of sea ice transport through Fram Strait: natural variability and sensitivity to forcing. J Geophys Res 103:5595–5606
Hibler WD (1979) A dynamic thermodynamic sea ice model. J Phys Oceanogr 9:815–846
Hibler WD, Bryan K (1987) A diagnostic ice-ocean model. J Phys Oceanogr 17:987–1015
Holloway G (1992) Representing topographic stress for large-scale ocean models. J Phys Oceanogr 22:1033–1046
Holfort J, Hansen E (2005) Timeseries of Polar water properties in Fram Strait. Geophys Res Lett 32:L19601. doi:10.1029/2005GL022957
Holfort J, Hansen E, Østerhus S, Dye S, Jonsson S, Meincke J, Mortensen J, Meredith M (2008) Freshwater fluxes east of Greenland. In: Dickson RR, Meincke J, Rhines P (eds) Arctic–subarctic ocean fluxes. Springer, Dordrecht, pp 263–287
Jakobsson M, Macnab R, Mayer L, Anderson R, Edwards M, Hatzky J, Schenke H-W, Johnson P (2008) An improved bathymetric portrayal of the Arctic Ocean: implications for ocean modeling and geological, geophysical and oceanographic analyses. Geo Res Lett 35:L07602. doi:10.1029/2008GL033520
Jones EP, Swift JH, Anderson LG, Lipizer M, Civitarese G, Falkner KK, Kattner G, McLaughlin F (2003) Tracing Pacific water in the North Atlantic Ocean. J Geophys Res 108(C4):3116. doi:10.1029/2001JC001141
Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Leetmaa A, Reynolds R, Jenne R, Joseph D (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471
Karcher MJ, Gerdes R, Kauker F, Köberle C (2003) Arctic warming—evolution and spreading of the 1990s warm event in the Nordic Seas and the Arctic Ocean. J Geophys Res 108:3034. doi:10.1029/2001JC001265
Karcher M, Gerdes R, Kauker F, Köberle C, Yashayaev I (2005) Simulation of a 1990s fresh water event in the Nordic Seas and the subpolar North Atlantic. Geophys Res Lett 32:L21606. doi:10.1029/2005GL023861
Kauker F, Gerdes R, Karcher M, Köberle C, Lieser J (2003) Variability of Northern hemisphere sea ice: a combined analysis of model results and observations from 1978 to 2001. J Geophys Res 108:3182. doi:10.1029/2002JC001573
Kauker F, Gerdes R, Karcher M, Köberle C (2005) Impact of North Atlantic Current changes on the Nordic Seas and the Arctic Ocean. J Geophys Res 110:C12002. doi:10.1029/2004JC002624
Levitus S et al (1994a) Salinity: NOAA Atlas NESDIS 3, World Ocean Atlas, vol 3. US Dept of Commerce, Washington DC
Levitus S et al (1994b) Temperature: NOAA Atlas NESDIS 4, World Ocean Atlas, vol 4. US Department of Commerce, Washington DC
Losch M, Sidorenko D, Beszczynska-Möller A (2005) FEMSECT: An inverse section model based on the finite element method. J Geophys Res 110:C12023. doi:10.1029/2005JC002910
Maslowski W, Marble D, Walczowski W, Schauer U, Clement JL, Semtner AJ (2004) On climatological mass, heat, and salt transports through the Barents Sea and Fram Strait from a pan-Arctic coupled ice-ocean model simulation. J Geophys Res 109:C03032. doi:10.1029/2001JC001039
Mauritzen C, Häkkinen S (1997) Influence of sea ice on the thermohaline circulation in the Arctic-North Atlantic Ocean. Geophys Res Lett 24:3257–3260
Pacanowski RC (1995) MOM 2 Documentation, user’s guide and reference manual, GFDL Ocean Group Tech. Rep. 3, Geophysical Fluid Dyn. Laboratory Princeton University, Princeton
Parkinson CL, Washington WM (1979) A large scale numerical model of sea ice. J Geophys Res 84:311–337
Rosati A, Miyakoda K (1988) A general circulation model for upper ocean simulation. J Phys Oceanogr 18(11):1601–1626
Rudels B, Friedrich HJ, Quadfasel D (1999) The Arctic circumpolar boundary current. Deep-Sea Res II 46:1023–1062
Rudels RM, Fahrbach E, Ivanov VV, Østerhus S, Quadfasel D, Schauer U, Tverberg V, Woodgate RA (2000) Water mass distribution in Fram Strait and over the Yermak Plateau in summer 1997. Annals of Geophysics 18:687–705
Rudels B, Jones EP, Schauer U, Eriksson P (2004) Atlantic sources of the Arctic Ocean surface and halocline waters. Polar Res 23(2):181–208
Schauer U, Fahrbach E, Oesterhus S, Rohardt G (2004) Arctic warming through the Fram Strait: oceanic heat transport from 3 years of measurements. J Geophys Res 109:C 06026. doi:10.1029/2003JC001823
Schauer U, Beszczynska-Möller A, Walczowski W, Fahrbach E, Piechura J, Hansen E (2008) Variation of flow through the Fram Strait to the Arctic ocean between 1997 and 2006. In: Dickson B, Meincke J, Rhines P (eds) Arctic–subarctic ocean fluxes. Springer, Dordrecht, pp 65–85
Schweckendiek U, Willebrand J (2005) Mechanisms affecting the overturning response in global warming simulations. J Climate 18(23):4925–4936
Semtner B (1976) A model for the thermodynamic growth of sea ice in numerical investigations of climate. J Phys Oceanogr 6:379–389
Steele M, Boyd T (1998) Retreat of the cold halocline layer in the Arctic Ocean. J Geophys Res 103:10419–10435
Stevens DP (1991) The open boundary condition in the United Kingdom Fine – Resolution Antarctic Model. J Phys Oceanogr 21:1494–1499
Treguier AM, Theetten S, Chassignet EP, Penduff T, Smith R, Talley L, Beisheim JO, Böning C (2005) The North Atlantic subpolar gyre in four high-resolution models. J Phys Oceanogr 35:757–774
Walczowski W, Piechura J (2007) Pathways of the Greenland Sea warming. Geo Res Lett 34:L10608. doi:101029/2007GL029974
Acknowledgments
The work reported here has been supported through the EU projects ASOF-N and DAMOCLES as well as the SFB 512 “Cyclones and the North Atlantic climate system” of the DFG. The DAMOCLES project is financed by the European Union in the 6th Framework Program for Research and Development. Forcing data for the model were taken from NCAR/NCEP reanalysis project. We thank Laura de Steur and an anonymous reviewer for constructive comments that were very helpful in improving our manuscript.
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Fieg, K., Gerdes, R., Fahrbach, E. et al. Simulation of oceanic volume transports through Fram Strait 1995–2005. Ocean Dynamics 60, 491–502 (2010). https://doi.org/10.1007/s10236-010-0263-9
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DOI: https://doi.org/10.1007/s10236-010-0263-9