contributor author | Silverthorne, Katherine E. | |
contributor author | Toole, John M. | |
date accessioned | 2017-06-09T16:25:12Z | |
date available | 2017-06-09T16:25:12Z | |
date copyright | 2009/04/01 | |
date issued | 2009 | |
identifier issn | 0022-3670 | |
identifier other | ams-67524.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4208981 | |
description abstract | Seasonal variability of near-inertial horizontal kinetic energy is examined using observations from a series of McLane Moored Profiler moorings located at 39°N, 69°W in the western North Atlantic Ocean in combination with a one-dimensional, depth-integrated kinetic energy model. The time-mean kinetic energy and shear vertical wavenumber spectra of the high-frequency motions at the mooring site are in reasonable agreement with the Garrett?Munk internal wave description. Time series of depth-dependent and depth-integrated near-inertial kinetic energy are calculated from available mooring data after filtering to isolate near-inertial-frequency motions. These data document a pronounced seasonal cycle featuring a wintertime maximum in the depth-integrated near-inertial kinetic energy deriving chiefly from the variability in the upper 500 m of the water column. The seasonal signal in the near-inertial kinetic energy is most prominent for motions with vertical wavelengths greater than 100 m but observable wintertime enhancement is seen down to wavelengths of the order of 10 m. Rotary vertical wavenumber spectra exhibit a dominance of clockwise-with-depth energy, indicative of downward energy propagation and implying a surface energy source. A simple depth-integrated near-inertial kinetic energy model consisting of a wind forcing term and a dissipation term captures the order of magnitude of the observed near-inertial kinetic energy as well as its seasonal cycle. | |
publisher | American Meteorological Society | |
title | Seasonal Kinetic Energy Variability of Near-Inertial Motions | |
type | Journal Paper | |
journal volume | 39 | |
journal issue | 4 | |
journal title | Journal of Physical Oceanography | |
identifier doi | 10.1175/2008JPO3920.1 | |
journal fristpage | 1035 | |
journal lastpage | 1049 | |
tree | Journal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 004 | |
contenttype | Fulltext | |