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contributor authorAlford, Matthew H.
contributor authorZhao, Zhongxiang
date accessioned2017-06-09T17:18:41Z
date available2017-06-09T17:18:41Z
date copyright2007/07/01
date issued2007
identifier issn0022-3670
identifier otherams-82961.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226132
description abstractUsing a set of 80 globally distributed time series of near-inertial and semidiurnal energy E and energy flux F computed from historical moorings, the group velocity ?g ≡ FE?1 is estimated. For a single free wave, observed group speed |?g| should equal that expected from linear wave theory. For comparison, the latitude dependence of perceived group speed for perfectly standing waves is also derived. The latitudinal dependence of observed semidiurnal |?g| closely follows that expected for free waves at all latitudes, implying that 1) low-mode internal tides obey linear theory and 2) standing internal-tidal waves are rare in the deep ocean for latitudes equatorward of about 35°. At higher latitudes, standing waves cannot be easily distinguished from free waves using this method because their expected group speeds are similar. Near-inertial waves exhibit scattered |?g| values consistent with the passage of events generated at various latitudes, with implied frequencies ? ≈ 1.05?1.25 ? f, as typically observed in frequency spectra.
publisherAmerican Meteorological Society
titleGlobal Patterns of Low-Mode Internal-Wave Propagation. Part II: Group Velocity
typeJournal Paper
journal volume37
journal issue7
journal titleJournal of Physical Oceanography
identifier doi10.1175/JPO3086.1
journal fristpage1849
journal lastpage1858
treeJournal of Physical Oceanography:;2007:;Volume( 037 ):;issue: 007
contenttypeFulltext


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