Spontaneous generation of near-inertial waves by the Kuroshio Front
MetadataShow full item record
KeywordCirculation/ Dynamics; Frontogenesis/frontolysis; Fronts; Internal waves; Turbulence; Upwelling/downwelling; Atm/Ocean Structure/ Phenomena; Jets
While near-inertial waves are known to be generated by atmospheric storms, recent observations in the Kuroshio Front find intense near-inertial internal-wave shear along sloping isopycnals, even during calm weather. Recent literature suggests that spontaneous generation of near-inertial waves by frontal instabilities could represent a major sink for the subinertial quasigeostrophic circulation. An unforced three-dimensional 1-km-resolution model, initialized with the observed cross-Kuroshio structure, is used to explore this mechanism. After several weeks, the model exhibits growth of 10–100-km-scale frontal meanders, accompanied by O(10) mW m−2 spontaneous generation of near-inertial waves associated with readjustment of submesoscale fronts forced out of balance by mesoscale confluent flows. These waves have properties resembling those in the observations. However, they are reabsorbed into the model Kuroshio Front with no more than 15% dissipating or radiating away. Thus, spontaneous generation of near-inertial waves represents a redistribution of quasigeostrophic energy rather than a significant sink.
Author Posting. © American Meteorological Society, 2015. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 45 (2015): 2381–2406, doi:10.1175/JPO-D-14-0086.1.
Showing items related by title, author, creator and subject.
Extreme magnesium isotope fractionation at outcrop scale records the mechanism and rate at which reaction fronts advance Pogge von Strandmann, Philip A. E.; Dohmen, Ralf; Marschall, Horst R.; Schumacher, John C.; Elliott, Tim (2014-10)Isotopic fractionation of cationic species during diffusive transport provides novel means of constraining the style and timing of metamorphic transformations. Here we document a major (~1‰) decrease in the Mg isotopic ...
Stern, Melvin E.; Helfrich, Karl R. (Cambridge University Press, 2002-10-10)A similarity solution to the long-wave shallow-water equations is obtained for a density current (reduced gravity = g[prime prime or minute], Coriolis parameter = f) propagating alongshore (y = 0). The potential vorticity ...
Farrell, W. E.; Berger, Jonathan; Bidlot, Jean-Raymond; Dzieciuch, Monika; Munk, Walter; Stephen, Ralph A.; Worcester, Peter F. (American Meteorological Society, 2016-05-10)A rapid and broadband (1 h, 1 < f < 400 Hz) increase in pressure and vertical velocity on the deep ocean floor was observed on seven instruments comprising a 20-km array in the northeastern subtropical Pacific. The authors ...