• Arndt, J. E., and Coauthors, 2013: The International Bathymetric Chart of the Southern Ocean (IBCSO) version 1.0—A new bathymetric compilation covering circum-Antarctic waters. Geophys. Res. Lett., 40, 31113117, doi:10.1002/grl.50413.

    • Search Google Scholar
    • Export Citation
  • Arneborg, L., A. K. Wåhlin, G. Björk, B. Liljebladh, and A. H. Orsi, 2012: Persistent inflow of warm water onto the central Amundsen shelf. Nat. Geosci., 5, 876880, doi:10.1038/ngeo1644.

    • Search Google Scholar
    • Export Citation
  • Bracegirdle, T. J., and G. J. Marshall, 2012: The reliability of Antarctic tropospheric pressure and temperature in the latest global reanalyses. J. Climate, 25, 71387146, doi:10.1175/JCLI-D-11-00685.1.

    • Search Google Scholar
    • Export Citation
  • Brink, K., 2006: Coastal-trapped waves with finite bottom friction. Dyn. Atmos. Oceans, 41, 172190, doi:10.1016/j.dynatmoce.2006.05.001.

    • Search Google Scholar
    • Export Citation
  • Darelius, E., L. Smedsrud, S. Österhus, A. Foldvik, and T. Gammelsröd, 2009: Structure and variability of the Filchner overflow plume. Tellus, 61A, 446464, doi:10.1111/j.1600-0870.2009.00391.x.

    • Search Google Scholar
    • Export Citation
  • Dee, D. P., and Coauthors, 2011: The ERA-Interim reanalysis: Configuration and performance of the data assimilation system. Quart. J. Roy. Meteor. Soc., 137, 553597, doi:10.1002/qj.828.

    • Search Google Scholar
    • Export Citation
  • Gill, A. E., 1982: Atmosphere–Ocean Dynamics. Academic Press, 662 pp.

  • Gordon, R. L., and J. M. Huthnance, 1987: Storm-driven continental shelf waves over the Scottish continental shelf. Cont. Shelf Res., 7, 10151048, doi:10.1016/0278-4343(87)90097-5.

    • Search Google Scholar
    • Export Citation
  • Ha, H. K., and Coauthors, 2014: Circulation and modification of warm deep water on the central Amundsen Shelf. J. Phys. Oceanogr., 44, 14931501, doi:10.1175/JPO-D-13-0240.1.

    • Search Google Scholar
    • Export Citation
  • Jacobs, S., A. Jenkins, C. Giulivi, and P. Dutrieux, 2011: Stronger ocean circulation and increased melting under Pine Island Glacier ice shelf. Nat. Geosci., 4, 519523, doi:10.1038/ngeo1188.

    • Search Google Scholar
    • Export Citation
  • Jenkins, A., P. Dutrieux, S. Jacobs, S. McPhail, J. Perrett, A. Webb, and D. White, 2010: Observations beneath Pine Island Glacier in West Antarctica and implications for its retreat. Nat. Geosci., 3, 468472, doi:10.1038/ngeo890.

    • Search Google Scholar
    • Export Citation
  • Jensen, M. F., I. Fer, and E. Darelius, 2013: Low frequency variability on the continental slope of the southern Weddell Sea. J. Geophys. Res. Oceans, 118, 42564272, doi:10.1002/jgrc.20309.

    • Search Google Scholar
    • Export Citation
  • Martinson, D. G., and D. C. McKee, 2012: Transport of warm Upper Circumpolar Deep Water onto the western Antarctic Peninsula continental shelf. Ocean Sci., 8, 433442, doi:10.5194/os-8-433-2012.

    • Search Google Scholar
    • Export Citation
  • Miller, A. J., P. F. J. Lermusiaux, and P.-M. Poulain, 1996: A topographic Rossby-mode resonance over the Iceland–Faeroe Ridge. J. Phys. Oceanogr., 26, 27352747, doi:10.1175/1520-0485(1996)026<2735:ATMROT>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Moffat, C., B. Owens, and R. C. Beardsley, 2009: On the characteristics of Circumpolar Deep Water intrusions on the west Antarctic Peninsula continental shelf. J. Geophys. Res., 114, C05017, doi:10.1029/2008JC004955.

    • Search Google Scholar
    • Export Citation
  • Padman, L., A. J. Plueddemann, R. D. Muench, and R. Pinkel, 1992: Diurnal tides near the Yermak Plateau. J. Geophys. Res., 97, 12 63912 652, doi:10.1029/92JC01097.

    • Search Google Scholar
    • Export Citation
  • St-Laurent, P., J. Klinck, and M. Dinniman, 2013: On the role of coastal troughs in the circulation of warm Circumpolar Deep Water on Antarctic shelves. J. Phys. Oceanogr., 43, 5164, doi:10.1175/JPO-D-11-0237.1.

    • Search Google Scholar
    • Export Citation
  • Thompson, A., 2008: The atmospheric ocean: Eddies and jets in the Antarctic Circumpolar Current. Philos. Trans. Roy. Soc., A366, 45294541, doi:10.1098/rsta.2008.0196.

    • Search Google Scholar
    • Export Citation
  • Thompson, A., K. J. Heywood, S. Schmidtko, and A. L. Stewart, 2014: Eddy transport as a key component of the Antarctic overturning circulation. Nat. Geosci., 7, 879884, doi:10.1038/ngeo2289.

    • Search Google Scholar
    • Export Citation
  • Thomson, D. J., 1982: Spectrum estimation and harmonic analysis. Proc. IEEE, 70, 10551096, doi:10.1109/PROC.1982.12433.

  • Torrence, C., and G. Compo, 1998: A practical guide to wavelet analysis. Bull. Amer. Meteor. Soc., 79, 6178, doi:10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Wåhlin, A. K., X. Yuan, G. Björk, and C. Nohr, 2010: Inflow of warm Circumpolar Deep Water in the central Amundsen shelf. J. Phys. Oceanogr., 40, 14271434, doi:10.1175/2010JPO4431.1.

    • Search Google Scholar
    • Export Citation
  • Wåhlin, A. K., and Coauthors, 2013: Variability of warm deep water inflow in a submarine trough on the Amundsen Sea shelf. J. Phys. Oceanogr., 43, 20542010, doi:10.1175/JPO-D-12-0157.1.

    • Search Google Scholar
    • Export Citation
  • Walker, D. P., M. A. Brandon, A. Jenkins, J. T. Allen, J. A. Dowdeswell, and J. Evans, 2007: Oceanic heat transport onto the Amundsen Sea shelf through a submarine glacial trough. Geophys. Res. Lett., 34, L02602, doi:10.1029/2006GL028154.

    • Search Google Scholar
    • Export Citation
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Subinertial Oscillations on the Amundsen Sea Shelf, Antarctica

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  • 1 Department of Marine Sciences, University of Gothenburg, Göteborg, Sweden
  • | 2 Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
  • | 3 Department of Ocean Sciences, Inha University, Incheon, South Korea
  • | 4 Korea Polar Research Institute, Incheon, South Korea
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Abstract

Mooring data from the western flank of Dotson trough, Amundsen Sea shelf region, show the presence of barotropic oscillations with a period of 40–80 h. The oscillations are visible in velocity, temperature, salinity, and pressure and are comparable to tides in magnitude. The period of the oscillations corresponds to topographic Rossby waves of low group velocity and a wavelength of about 40 km, that is, the half-width of the channel. It is suggested that these resonant topographic Rossby waves cause the observed peak in the wave spectra. The observations show that sparse CTD data from this region should be treated with caution and need to be complemented with moorings or yo-yo stations in order to give a representative picture for the hydrography.

Denotes Open Access content.

Corresponding author address: Dr. A. K. Wåhlin, Department of Earth Sciences, University of Gothenburg, P.O. Box 460, 40530 Göteborg, Sweden. E-mail: awahlin@gu.se

Abstract

Mooring data from the western flank of Dotson trough, Amundsen Sea shelf region, show the presence of barotropic oscillations with a period of 40–80 h. The oscillations are visible in velocity, temperature, salinity, and pressure and are comparable to tides in magnitude. The period of the oscillations corresponds to topographic Rossby waves of low group velocity and a wavelength of about 40 km, that is, the half-width of the channel. It is suggested that these resonant topographic Rossby waves cause the observed peak in the wave spectra. The observations show that sparse CTD data from this region should be treated with caution and need to be complemented with moorings or yo-yo stations in order to give a representative picture for the hydrography.

Denotes Open Access content.

Corresponding author address: Dr. A. K. Wåhlin, Department of Earth Sciences, University of Gothenburg, P.O. Box 460, 40530 Göteborg, Sweden. E-mail: awahlin@gu.se
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