Arctic–Subarctic Ocean Fluxes: Defining the Role of the Northern Seas in Climate
Almost 100 years ago, Helland-Hansen and Nansen (1909) produced the first complete description of the pattern of oceanic exchanges that connect the North Atlantic with the Arctic Ocean through subarctic seas. At a stroke, they placed the science of the Nordic seas on an astonishingly modern footing; as Blindheim and Østerhus (2005) put it, ‘Their work described the sea in such detail and to such precision that investigations during succeeding years could add little to their findings’. Nonetheless, in the century that followed, oceanographers have gradually persisted in the two tasks that were largely inaccessible to the early pioneers – quantifying the exchanges of heat, salt and mass through subarctic seas and, piecing-together evidence for the longer-term (decade to century) variability of the system.
Evidence of variability was not long in coming. As hydrographic time series lengthened into the middle decades of the 20th century, they began to capture evidence of one of the largest and most widespread regime shifts that has ever affected our waters. For these were the decades of “the warming in the north”, when the salinity of North Atlantic Water passing through the Faroe–Shetland Channel reached a century-long high (Dooley et al. 1984), when salinities were so high off Cape Farewell that they were thrown out as erroneous (Harvey 1962), when a precipitous warming of more than 2 °C in the 5-year mean pervaded the West Greenland banks, and when the northward dislocations of biogeographical boundaries for a wide range of species from plankton to commercially important fish, terrestrial mammals and birds were at their most extreme in the 20th century (reviewed in Dickson 2002).
KeywordsConvection Covariance Fishing Editing Banner
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- Blindheim J and S Østerhus, 2005. The Nordic Seas, main oceanographic features. In: Drange H et al. (Eds) The Nordic Seas: An Integrated Perspective. AGU Monograph 158 American Geophysical Union, Washington, DC, pp. 11–37.Google Scholar
- Dickson RR, 2002. Variability at all scales and its effect on the ecosystem—an overview. Proc. ICES Hist. Symp. Helsinki, August 2000. ICES Mar Sci Symp Ser, 215, 219–232.Google Scholar
- Dooley H D, JHA Martin and DJ Ellett, 1984. Abnormal hydrographic conditions in the Northeast Atlantic during the 1970s. Rapports et Procès-Verbaux des Réunions du Conseil International pour l’Exploration de la Mer, 185, 179–187.Google Scholar
- Haak H, J Jungclaus, T Koenigk, D Svein and U Mikolajewicz, 2005. Arctic Ocean freshwater budget variability. ASOF Newsletter (3), 6–8. [http://asof.npolar.no].
- Harvey JG, 1962. Hydrographic conditions in Greenland waters during August 1960. Annales Biologiques du Conseil International pour l’Exploration de la Mer, 17: 14–17.Google Scholar
- Helland-Hansen B and F Nansen, 1909. The Norwegian Sea. Its physical oceanography based upon the Norwegian researches 1900–1904. Report on Norwegian Fishery and Marine Investigations, volume II, part I, Chapter 2, 360 pp., tables, figures (total 390 pp.).Google Scholar
- Holliday NP, SL Hughes, A Lavin, KA Mork, G Nolan, W Walcowski and A Breszczynska-Moller, 2007. The end of a trend? The progression of unusually warm and saline water from the eastern North Atlantic into the Arctic Ocean. CLIVAR Exchanges, 12 (1) pp 19–20 + figs.Google Scholar
- ICES, 2007. ICES Report on Ocean Climate 2006. ICES Cooperative Research Report No 289, 59 pp.Google Scholar
- McCartney MS, 1996. Sverdrup Lecture to AGU Fall Meeting San Francisco, December 1996.Google Scholar
- Mikolajewicz U, M Groger, E Maier-Reimer, G Schurgers, M Vizcaino and AME Winguth, 2007. Long-term effects of anthropogenic CO2 emissions simulated with a complex earth system model. Climate Dyn, doi 10.1007/s00382–006–0204-y.Google Scholar
- Morison J, K Aagaard and M Steele, 2000. Recent environmental changes in the Arctic: a review. Arctic, 53, 359–371.Google Scholar
- Polyakov IV, A Beszczynska, E Carmack, I Dmitrenko, E Fahrbach, I Frolov, R Gerdes, E Hansen, J Holfort, V Ivanov, M Johnson, M Karcher, F Kauker, J Morrison, K Orvik, U Schauer, H Simmons, Ø Skagseth, V Sokolov, M Steele, L Timkhov, D Walsh and J Walsh, 2005. One more step toward a warmer Arctic. Geophys Res Lett, 32, L17605, doi:10.1029/2005GL023740.CrossRefGoogle Scholar
- Polyakov I, L Timokhov, I Dmitrenko, V Ivanov, H Simmons, F McLaughlin, R Dickson, E Fahrbach, J-C Gascard, P Holliday, L Fortier, E Hansen, C Mauritzen, J Piechura, U Schauer and M Steele 2007. The International Polar Year under the banner of Arctic Ocean warming. EOS, 88(40), 398–399.CrossRefGoogle Scholar
- Worthington LV, 1969. An attempt to measure the volume transport of Norwegian Sea overflow water through the Denmark Strait. Deep-Sea Res, 16 (Suppl), 421–432.Google Scholar