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Near-Inertial Internal Waves and Sea Ice in the Beaufort Sea

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  • The evolution of the near-inertial internal wavefield from ice-free summertime conditions to ice-covered wintertime conditions is examined using data from a yearlong deployment of six moorings on the Beaufort continental slope from August 2008 to August 2009. When ice is absent, from July to October, energy is efficiently transferred from the atmosphere to the ocean, generating near-inertial internal waves. When ice is present, from November to June, storms also cause near-inertial oscillations in the ice and mixed layer, but kinetic energy is weaker and oscillations are quickly damped. Damping is dependent on ice pack strength and morphology. Decay scales are longer in early winter (November–January) when the new ice pack is weaker and more mobile, decreasing in late winter (February–June) when the ice pack is stronger and more rigid. Efficiency is also reduced, as comparisons of atmospheric energy available for internal wave generation to mixed layer kinetic energies indicate that a smaller percentage of atmospheric energy is transferred to near-inertial motions when ice concentrations are >90%. However, large kinetic energies and shears are observed during an event on 16 December and spectral energy is elevated above Garrett–Munk levels, coinciding with the largest energy flux predicted during the deployment. A significant amount of near-inertial energy is episodically transferred to the internal wave band from the atmosphere even when the ocean is ice covered; however, damping by ice and less efficient energy transfer still leads to low Arctic internal wave energy in the near-inertial band. Increased kinetic energy below 300m when ice is forming suggests some events may generate internal waves that radiate into the Arctic Ocean interior.
  • This is the publisher’s final pdf. The published article is copyrighted by the American Meteorological Society and can be found at: http://journals.ametsoc.org/loi/phoc.
  • Keywords: Geographic location/entity, Sea ice, Atmosphere-ocean interaction, Arctic, Circulation/Dynamics, Internal waves
  • Keywords: Geographic location/entity, Sea ice, Atmosphere-ocean interaction, Arctic, Circulation/Dynamics, Internal waves
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  • Martini, K. I., Simmons, H. L., Stoudt, C. A., & Hutchings, J. K. (2014). Near-Inertial Internal Waves and Sea Ice in the Beaufort Sea. Journal of Physical Oceanography, 44(8), 2212-2234. doi:10.1175/JPO-D-13-0160.1
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  • 44
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  • 8
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  • Kim Martini and Chase Stoudtwere supported by NSF Award ARC-0909432. HarperSimmons and Jennifer Hutchings were supported byONR Award N00014-06-1-0728.
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