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Mode 2 waves on the continental shelf: Ephemeral components of the nonlinear internal wavefield Public Deposited

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  • Shoreward propagating, mode 2 nonlinear waves appear sporadically in mooring records obtained off the coast of New Jersey in the summer of 2006. Individual mode 2 packets were tracked between two moorings separated by 1 km; however, packets could not be tracked between moorings separated by greater distances from one another (∼10 km). The inability to track individual packets large distances through the mooring array combined with detailed observations from a ship suggest that these waves are short lived. The evolution of the ship‐tracked wave group was recorded using acoustic backscatter, acoustic Doppler current profilers, and turbulence profiling. The leading mode 2 wave quickly changed form and developed a tail of short, small‐amplitude mode 1 waves. The wavelength of the mode 1 oscillations agreed with that expected for a copropagating tail on the basis of linear theory. Turbulent dissipation in the mixed layer and radiation of the short mode 1 waves contributed to rapid energy loss in the leading mode 2 wave, consistent with the observed decay rate and short life span of only a few hours. The energy in the leading mode 2 wave was 10–100 times smaller than the energy of mode 1 nonlinear internal waves observed during the experiment; however, the magnitudes of wave‐localized turbulent dissipation were similar.
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  • Shroyer, E. L., J. N. Moum, and J. D. Nash (2010), Mode 2 waves on the continental shelf: Ephemeral components of the nonlinear internal wavefield, J. Geophys. Res., 115, C07001, doi:10.1029/2009JC005605.
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  • 115
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  • C7
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  • This work was funded by the Office of Naval Research.
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  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2011-09-21T21:33:27Z No. of bitstreams: 1 MoumJN.COAS.Mode2Waves.pdf: 1593101 bytes, checksum: a6a9a09e9d196c2aac0ea1dfb848ed4d (MD5)
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