Freshwater Storage in the Northern Ocean and the Special Role of the Beaufort Gyre

  • Eddy Carmack
  • Fiona McLaughlin
  • Michiyo Yamamoto-Kawai
  • Motoyo Itoh
  • Koji Shimada
  • Richard Krishfield
  • Andrey Proshutinsky

As part of the global hydrological cycle, freshwater in the form of water vapour inexorably moves from warm regions of evaporation to cold regions of precipitation and freshwater in the form of sea ice and dilute seawater inexorably moves from cold regions of freezing and net precipitation to warm regions of melting and net evaporation. The global plumbing that supports the ocean’s freshwater loop is complicated, and involves land–sea exchanges, geographical and dynamical constraints on flow pathways as well as forcing variability over time (cf. Lagerloef and Schmitt 2006). The Arctic Ocean is a central player in the global hydrological cycle in that it receives, transforms, stores, and exports freshwater, and each of these processes and their rates both affect and are affected by climate variability. And within the Arctic Ocean, the Canada Basin (see Fig. 7.1) is of special interest for three reasons: (1) it processes freshwater from the Pacific, from North American and Eurasian rivers and from ice distillation; (2) it is the largest freshwater storage reservoir in the northern oceans; and (3) it has exhibited changes in halocline structure and freshwater storage in recent years.

In this chapter we examine the distribution of freshwater anomalies (relative to a defined reference salinity) in northern oceans by reviewing criteria that have been used to construct freshwater budgets and then by comparing freshwater disposition in the subarctic Pacific, subarctic Atlantic and Arctic oceans. This comparison provides a useful basis for the interpretation of Arctic Ocean flux measurements and affirms that the Canada Basin is a significant freshwater reservoir (Section 7.2). We next examine various hydrographic data sources within the Canada Basin (a geographical feature) to define the role of the Beaufort Gyre (a wind-forced dynamical feature) in freshwater storage and release (Section 7.3). Due to this latter feature, the upper layer circulation in the Beaufort Gyre is anticyclonic whereas circulation elsewhere in the Arctic Ocean is cyclonic. Then we examine the Canada Basin’s role as a reservoir with respect to sources of its freshwater components (e.g. meteoritic (runoff and precipitation), sea-ice melt and Pacific throughflow), and also to its water mass structure, within which freshwater components are stored (Section 7.4). This distinction among source components and among water mass affiliations is a prerequisite to interpreting downstream freshwater fluxes and to predicting the response of the Arctic system to climate variability. Finally, we combine geochemical data and recent freshwater budget estimates to calculate the relative contributions of freshwater components from the Canada Basin to other Arctic basins (Section 7.5). A summary and outlook is given in Section 7.6.

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References

  1. Aagaard K, Carmack EC (1989) The role of freshwater sea ice and other fresh waters in the Arctic circulation. Journal of Geophysical Research, 94, 14485–14498.CrossRefGoogle Scholar
  2. Aagaard K, Weingartner TJ, Danielson SL, Woodgate RA, Johnson GC, Whitledge TE (2006) Some controls on flow and salinity in Bering Strait. Geophysical Research Letters, submitted.Google Scholar
  3. Anderson LG, Björk G, Holby O, Jones EP, Kattner G, Koltermann KP, Liljeblad B, Lindegren R, Rudels B, Swift J (1994) Water masses and circulation in the Eurasian Basin: Results frm the Oden-91 expedition. Journal of Geophysical Research, 99, 3273–3283.CrossRefGoogle Scholar
  4. Bacon S, Reverin G, Rigor IG, Snaith HM (2002) A freshwater jet on the east Greenland shelf, Journal of Geophysical Research, 107, doi: 10.1029/2001JC00935.Google Scholar
  5. Bauch D, Schlosser P, Fairbanks R (1995) Freshwater balance and sources of deep and bottom water in the Arctic Ocean inferred from the distribution of H2 18O, Progress in Oceanography, 35, 53–80.CrossRefGoogle Scholar
  6. Carmack EC (2000) The Arctic Ocean's freshwater budget: sources, storage and export. In: The Freshwater Budget of the Arctic Ocean. EL Lewis, EP Jones, P Lemke, TD Prowse and P Wadhams (eds.), Kluwer, Dordrecht, The Netherlands, pp. 91–126.Google Scholar
  7. Carmack EC (2007) The alpha/beta ocean distinction: a perspective on freshwater fluxes, convection, nutrients and productivity in high-latitude seas, Deep-Sea Research II, 54, 2578–2598.CrossRefGoogle Scholar
  8. Carmack EC, Chapman DC (2003) Wind-driven shelf/Basin exchange on an Arctic Shelf: The joint roles of ice cover extent and shelf-break bathymetry. Geophysical Research Letters, 30, 1778, doi: 10 1029/2003GL017526.CrossRefGoogle Scholar
  9. Carmack EC, McLaughlin FA (2001) Arctic Ocean change and consequences to biodiversity: a perspective on linkage and scale, Memoirs of National Institute of Polar Research, Special Issue, 54, 365–375.Google Scholar
  10. Carmack EC, Macdonald RW, Papadakis JE (1989) Water mass structure and boundaries in the Mackenzie Shelf Estuary, Journal of Geophysical Research, 94, 18043–18055.CrossRefGoogle Scholar
  11. Cenedese C, Linden PF (2002) Stability of a buoyancy driven coastal current at the shelf-break. Journal of Fluid Mechanics, 452, 97–121.CrossRefGoogle Scholar
  12. Chapman DC, Beardsley RC (1989) On the origin of shelf water in the Middle Atlantic Bight. Journal of Physical Oceanography, 18, 384–391.CrossRefGoogle Scholar
  13. Conkright ME, Antonov JI, Baranova O, Boyer TP, Garcia HE, Gelfeld R, Johnson D, Locarnini RA, Murphy PP, O'Brien TD, Smolyar I, Stephens C (2002) World Ocean Data Base 2001 vol. 1. In: Introduction. Sydney Levitus (ed.) NOAA Atlas NESDIS 42, US Government Printing Office, Washington, DC, 167 pp.Google Scholar
  14. Dickson RR, Meincke J, Malmberg S-A, Lee AJ (1988) The “Great Salinity Anomaly” in the northern North Atlantic 1968–1982, Progress in Oceanography, 20, 103–151.CrossRefGoogle Scholar
  15. Dickson RR, Dye S, Karcher M, Meincke J, Rudels B, Yashayaev I (2007) Current Estimates of freshwater flux through Arctic and Subarctic seas. Progress in Oceanography, 73, 210–230, doi:10.1016/j.pocean.2006.12.003.CrossRefGoogle Scholar
  16. Dukhovskoy DS, Johnson MA, Proshutinsky A (2004) Arctic decadal variability: An auto-oscillatory system of heat and fresh water exchange. Geophysical Research Letters, 31, doi:10.1029/GL019023.Google Scholar
  17. Déry SJ, Wood EF (2005) Decreasing river discharge in Northern Canada, Geophysical Research Letters, 32, doi:10.1029/GL022845.Google Scholar
  18. Ekwurzel B, Schlosser P, Mortlock R, Fairbanks R, Swift J (2001) River runoff, sea-ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean. Journal of Geophysical Research, 106, 9075–9092.CrossRefGoogle Scholar
  19. Environmental Working Group, Joint U.S.-Russian Atlas of the Arctic Ocean for the Winter Period [CD-ROM] (1998) National. Snow and Ice Data Center. Boulder, CO.Google Scholar
  20. Falkner KK, O'Brien M, Carmack E, McLaughlin F, Melling H, Muenchow A, Jones EP (2006) Implications of nutrient variability in passages of the Canadian Archipelago and Baffin Bay for freshwater throughflow and local productivity. Journal of Geophysical Research, submitted.Google Scholar
  21. Falck E, Kattner G, Budéus G (2005) Disappearance of Pacific Water in the northwestern Fram Strait. Geophysical Research Letters, 32, doi:10.1029/2005GL023400.Google Scholar
  22. Griffiths RW (1986) Gravity currents in rotating systems. Annual Reviews in Fluid Mechanics 18, 59–89.CrossRefGoogle Scholar
  23. Guay CK, Falkner KK (1997) Barium as a tracer of Arctic halocline and river waters. Deep Sea Research, II, 44, 1543–1570.CrossRefGoogle Scholar
  24. Häkkinen S, Proshutinsky A (2004) Freshwater content variability in the Arctic Ocean. Journal of Geophysical Research, 109, doi:10.1029/2003JC001940.Google Scholar
  25. Jones EP, Anderson LG, Swift JH (1998) Distribution of Atlantic and Pacific waters in the upper Arctic Ocean: implications for circulation. Geophysical Research Letters, 25, 765–768.CrossRefGoogle Scholar
  26. Jones EP, Swift JH, Anderson LG, Lipizer M, Civitarese G, Falkner KK, Kattner G, McLaughlin FA (2003) Tracing Pacific water in the North Atlantic, Journal of Geophysical Research, 108, doi:10.1029/2001JC001141.Google Scholar
  27. Lagerloef G, Schmitt R (2006) Role of ocean salinity in climate and near-future satellite measurements, Eos 87.Google Scholar
  28. Lammers RB, Shiklomanov AI, Vorosmarty CJ, Fekete BM, and Peterson BJ (2001) Assessment of contemporary Arctic river runoff based on observational discharge records, Journal of Geophysical Research, 106, 3321–3334.CrossRefGoogle Scholar
  29. Macdonald RW, Paton DW, Carmack EC, Omstedt A (1995) The freshwater budget and under-ice spreading of Mackenzie River water in the Canadian Beaufort Sea based on salinity and 18O/16O measurements in water and ice. Journal of Geophysical Research, 100, 895–919.CrossRefGoogle Scholar
  30. Macdonald RW, Mclaughlin FA, Carmack EC (2002) Freshwater and its sources during the SHEBA drift in the Canada Basin of the Arctic Ocean. Deep-Sea Research, II, 49, 1769–1785.CrossRefGoogle Scholar
  31. McLaughlin FA, Carmack EC, Macdonald RW, Bishop JKB (1996) Physical and geochemical properties across the Atlantic/Pacific front in the southern Canadian Basin. Journal of Geophysical Research, 101, 1183–1197.CrossRefGoogle Scholar
  32. McLaughlin FA, Carmack EC, Macdonald RW, Weaver AJ, Smith J (2002) The Canada Basin 1989–1995: Upstream events and far-field effects of the Barents Sea. Journal of Geophysical Research, 107, doi:10.1029/2001JC000904.Google Scholar
  33. McLaughlin FA, Carmack EC, Macdonald RW, Melling H, Swift JH, Wheeler PA, Sherr BF, Sherr EB (2004) The joint roles of Pacific and Atlantic-origin waters in the Canada Basin, 1997–1998. Deep Sea Research, I, 51, 107–128.CrossRefGoogle Scholar
  34. McLaughlin FA, Carmack EC, Ingram RG, Williams WJ, Michel C (2006) Oceanography of the Northwest Passage, Chapter 31. In: The Sea Vol 14: The Global Coastal Ocean, Interdisciplinary Regional Studies and Syntheses. AR Robinson, KH Brink (eds.), Harvard University Press, 1213–1244.Google Scholar
  35. Melling H, Moore RM (1995) Modifications of halocline source waters during freezing on the Beaufort Sea shelf: evidence from oxygen isotopes and dissolved nutrients. Continental Shelf Research, 15, 89–113.CrossRefGoogle Scholar
  36. Östlund HG (1982) The residence time of the freshwater component in the Arctic Ocean. Journal of Geophysical Research, 89, 6373–6381.CrossRefGoogle Scholar
  37. Peterson BJ, McClelland J, Curry R, Holmes RN, Walsh JE, Aagaard K. (2006) Trajectory shifts in the Arctic and Subarctic freshwater cycle. Science, 313, 1061–1066.CrossRefGoogle Scholar
  38. Polyakov IV, Alexeev V, Belchansky GI, Dmitrenko IA, Ivanov V, Kirillov S, Korablev A, Steele M, Timokhov LA, Yashayaev I (2007) Arctic Ocean freshwater changes over the past 100 years and their causes. Journal of Climate, in press.Google Scholar
  39. Proshutinsky A, Bourke RH, McLaughlin FA (2002) The role of the Beaufort Gyre in Arctic climate variability: Seasonal to decadal climate scales. Geophysical Research Letters, 29, 2100, doi:10.1029/2002gl015847.CrossRefGoogle Scholar
  40. Proshutinsky A, Yang J, Krishfield R, Gerdes R, Karcher M, Kauker F, Koeberle C, Hakkinen S, Hibler W, Holland D, Maqueda M, Holloway G, Hunke E, Maslowski W, Steele M, Zhang J (2005) Arctic Ocean Study: Synthesis of Model Results and Observations. Eos Transactions of the AGU, 86, 368, doi:10.1029/2005EO400003.Google Scholar
  41. Richter-Menge J, Overland J, Proshutinsky A, Romanovsky V, Gascard JC, Karcher M, Maslanik J, Perovich D, Shiklomanov A, Walker D (2006) Arctic. In: State of the Climate in 2005. K.A. Shen (ed.), Special Supplement to the Bulletin of the American Meteorological Society, 87, S46–S52.Google Scholar
  42. Rigor I, Wallace JM (2004) Variations in the age of Arctic sea-ice and summer sea-ice extent. Geophysical Research Letters, 31, doi:10.1029/2004GL019492.Google Scholar
  43. Royer TC (1982) Coastal fresh water discharge in the Northeast Pacific. Journal of Geophysical Research, 87, 2017–2021.CrossRefGoogle Scholar
  44. Serreze MC, Barrett AP, Slater AG, Woodgate RA, Aagaard K, Lammers RB, Steele M, Moritz R, Meredith M, Lee C (2006) The large-scale freshwater cycle of the Arctic. Journal of Geophysical Research, 111(C11), doi:10.1029/2005JC003424.Google Scholar
  45. Shimada K, McLaughlin FA, Carmack EC, Proshutinsky A, Nishino S, Itoh M (2004) Penetration of the 1990s warm temperature anomaly of Atlantic water in the Canada Basin. Geophysical Research Letters, 31, doi:10.1029/2004GL020860.Google Scholar
  46. Shimada K, Kamoshida T, Nishino S, Itoh M, McLaughlin FA, Carmack EC, Zimmerman S, Proshutinsky A (2006) Pacific Ocean Inflow: influence on catastrophic reduction of sea ice cover in the Arctic Ocean. Geophysical Research Letters, 33, L08605, doi:10.1029/2005GL025624.CrossRefGoogle Scholar
  47. Smethie WM, Schlosser P, Bönisch G, Hopkins TS (2000) Renewal and circulation of intermediate water in the Canadian Basin observed on the SICEX 96 cruise. Journal of Geophysical Research, 105, 1105–1121.CrossRefGoogle Scholar
  48. Steele M, Ernold W (2007) Steric sea level change in the Northern Seas. Journal of Climate, 20, 403–417.CrossRefGoogle Scholar
  49. Steele M, Morison J, Ernold W, Rigor I, Ortmeyer M, Shimada K (2004) Circulation of summer Pacific halocline water in the Arctic Ocean. Journal of Geophysical Research, 109, doi:10.1029/JC002009.Google Scholar
  50. Stigebrandt A (1984) The North Pacific: A global scale estuary. Journal of Physical Oceanography, 14, 464–470.CrossRefGoogle Scholar
  51. Swift JH, Aagaard K, Timokhov L, Nikiforov EG (2005) Long-term variability of Arctic Ocean waters: evidence from a reanalysis of the EWG data set. Journal of Geophysical Research, 110, doi:10.1029/2004JC002312.Google Scholar
  52. Tully JP, Barber FG (1960) An estuarine analogy of the subarctic Pacific Ocean. Journal of the Fisheries Research Board of Canada 17, 91–112.Google Scholar
  53. Walin G (1977) A theoretical framework for the description of estuaries. Tellus, 29, 128–136.CrossRefGoogle Scholar
  54. Weingartner TJ, Cavalieri DJ, Aagaard K, Sasaki Y (1998) Circulation, dense water formation and outflow on the northeast Chukchi shelf. Journal of Geophysical Research, 103, 7647–7661.CrossRefGoogle Scholar
  55. Wijffels SE, Schmitt RW, Bryden HL, Stigebrandt A (1992) Transport of freshwater by the oceans, Journal of Physical Oceanography, 22, 155–162.CrossRefGoogle Scholar
  56. Williams WJ, Weingartner TJ, Hermann AJ (2006) Idealized 3-dimensional modeling of seasonal variation in the Alaska Coastal Current. Journal of Geophysical Research, in revision.Google Scholar
  57. Woodgate R, Aagaard K (2005) Revising the Bering Strait freshwater flux into the Arctic Ocean. Geophysical Research Letters, 32, doi:10.1029/2004GL021747.Google Scholar
  58. Woodgate R, Aagaard K, Weingartner TJ (2005) Monthly temperature, salinity, and transport variability of the Bering Strait through flow. Geophysical Research Letters, 32, doi:10.1029/2004GL21880.Google Scholar
  59. Yamamoto-Kawai M, Tanaka N, Pivovarov S (2005) Freshwater and brine behaviours in the Arctic Ocean deduced from historical data of Y18O and alkalinity (1929–2002 A.D.). Journal of Geophysical Research, 100, doi:10.1029/2004JC002793.Google Scholar
  60. Yamamoto-Kawai M, McLaughlin FA, Carmack EC, Nishino S, Shimada K (2008) Freshwater budget of the Canada Bain of the Arctic Ocean from geochemical tracer data. Journal of Geophysical Research, in press.Google Scholar
  61. Zhang X, Zhang J (2001) Heat and freshwater budgets and pathways in the Arctic Mediterranean in a coupled ocean/ sea-ice model. Journal of Oceanography, 57, 207–234.CrossRefGoogle Scholar

Copyright information

© Springer Science + Business Media B.V 2008

Authors and Affiliations

  • Eddy Carmack
    • 1
  • Fiona McLaughlin
    • 1
  • Michiyo Yamamoto-Kawai
    • 1
  • Motoyo Itoh
    • 2
  • Koji Shimada
    • 2
  • Richard Krishfield
    • 3
  • Andrey Proshutinsky
    • 3
  1. 1.Institute of Ocean ScienceFisheries and Oceans CanadaCanada
  2. 2.Japan Agency for Marine-Earth Science and TechnologyJapan
  3. 3.Woods Hole Oceanographic InstitutionWoods HoleUSA

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