contributor author | Barkan, Roy | |
contributor author | Winters, Kraig B. | |
contributor author | McWilliams, James C. | |
date accessioned | 2017-06-09T17:22:13Z | |
date available | 2017-06-09T17:22:13Z | |
date copyright | 2017/01/01 | |
date issued | 2016 | |
identifier issn | 0022-3670 | |
identifier other | ams-83953.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4227235 | |
description abstract | he effects of internal waves (IWs), externally forced by high-frequency wind, on energy pathways are studied in submesoscale-resolving numerical simulations of an idealized wind-driven channel flow. Two processes are examined: the direct extraction of mesoscale energy by externally forced IWs followed by an IW forward energy cascade to dissipation and stimulated imbalance, a mechanism through which externally forced IWs trigger a forward mesoscale to submesoscale energy cascade to dissipation. This study finds that the frequency and wavenumber spectral slopes are shallower in solutions with high-frequency forcing compared to solutions without and that the volume-averaged interior kinetic energy dissipation rate increases tenfold. The ratio between the enhanced dissipation rate and the added high-frequency wind work is 1.3, demonstrating the significance of the IW-mediated forward cascades. Temporal-scale analysis of energy exchanges among low- (mesoscale), intermediate- (submesoscale), and high-frequency (IW) bands shows a corresponding increase in kinetic energy Ek and available potential energy APE transfers from mesoscales to submesoscales (stimulated imbalance) and mesoscales to IWs (direct extraction). Two direct extraction routes are identified: a mesoscale to IW Ek transfer and a mesoscale to IW APE transfer followed by an IW APE to IW Ek conversion. Spatial-scale analysis of eddy?IW interaction in solutions with high-frequency forcing shows an equivalent increase in forward Ek and APE transfers inside both anticyclones and cyclones. | |
publisher | American Meteorological Society | |
title | Stimulated Imbalance and the Enhancement of Eddy Kinetic Energy Dissipation by Internal Waves | |
type | Journal Paper | |
journal volume | 47 | |
journal issue | 1 | |
journal title | Journal of Physical Oceanography | |
identifier doi | 10.1175/JPO-D-16-0117.1 | |
journal fristpage | 181 | |
journal lastpage | 198 | |
tree | Journal of Physical Oceanography:;2016:;Volume( 047 ):;issue: 001 | |
contenttype | Fulltext | |