Reflection of Linear Internal Tides from Realistic Topography: The Tasman Continental SlopeSource: Journal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 011::page 3321Author:Klymak, Jody M.
,
Simmons, Harper L.
,
Braznikov, Dmitry
,
Kelly, Samuel
,
MacKinnon, Jennifer A.
,
Alford, Matthew H.
,
Pinkel, Robert
,
Nash, Jonathan D.
DOI: 10.1175/JPO-D-16-0061.1Publisher: American Meteorological Society
Abstract: he reflection of a low-mode internal tide on the Tasman continental slope is investigated using simulations of realistic and simplified topographies. The slope is supercritical to the internal tide, which should predict a large fraction of the energy reflected. However, the response to the slope is complicated by a number of factors: the incoming beam is confined laterally, it impacts the slope at an angle, there is a roughly cylindrical rise directly offshore of the slope, and a leaky slope-mode wave is excited. These effects are isolated in simulations that simplify the topography. To separate the incident from the reflected signal, a response without the reflector is subtracted from the total response to arrive at a reflected signal. The real slope reflects approximately 65% of the mode-1 internal tide as mode 1, less than two-dimensional linear calculations predict, because of the three-dimensional concavity of the topography. It is also less than recent glider estimates, likely as a result of along-slope inhomogeneity. The inhomogeneity of the response comes from the Tasman Rise that diffracts the incoming tidal beam into two beams: one focused along beam and one diffracted to the north. Along-slope inhomogeneity is enhanced by a partially trapped, superinertial slope wave that propagates along the continental slope, locally removing energy from the deep-water internal tide and reradiating it into the deep water farther north. This wave is present even in a simplified, straight slope topography; its character can be predicted from linear resonance theory, and it represents up to 30% of the local energy budget.
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contributor author | Klymak, Jody M. | |
contributor author | Simmons, Harper L. | |
contributor author | Braznikov, Dmitry | |
contributor author | Kelly, Samuel | |
contributor author | MacKinnon, Jennifer A. | |
contributor author | Alford, Matthew H. | |
contributor author | Pinkel, Robert | |
contributor author | Nash, Jonathan D. | |
date accessioned | 2017-06-09T17:22:04Z | |
date available | 2017-06-09T17:22:04Z | |
date copyright | 2016/11/01 | |
date issued | 2016 | |
identifier issn | 0022-3670 | |
identifier other | ams-83914.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4227192 | |
description abstract | he reflection of a low-mode internal tide on the Tasman continental slope is investigated using simulations of realistic and simplified topographies. The slope is supercritical to the internal tide, which should predict a large fraction of the energy reflected. However, the response to the slope is complicated by a number of factors: the incoming beam is confined laterally, it impacts the slope at an angle, there is a roughly cylindrical rise directly offshore of the slope, and a leaky slope-mode wave is excited. These effects are isolated in simulations that simplify the topography. To separate the incident from the reflected signal, a response without the reflector is subtracted from the total response to arrive at a reflected signal. The real slope reflects approximately 65% of the mode-1 internal tide as mode 1, less than two-dimensional linear calculations predict, because of the three-dimensional concavity of the topography. It is also less than recent glider estimates, likely as a result of along-slope inhomogeneity. The inhomogeneity of the response comes from the Tasman Rise that diffracts the incoming tidal beam into two beams: one focused along beam and one diffracted to the north. Along-slope inhomogeneity is enhanced by a partially trapped, superinertial slope wave that propagates along the continental slope, locally removing energy from the deep-water internal tide and reradiating it into the deep water farther north. This wave is present even in a simplified, straight slope topography; its character can be predicted from linear resonance theory, and it represents up to 30% of the local energy budget. | |
publisher | American Meteorological Society | |
title | Reflection of Linear Internal Tides from Realistic Topography: The Tasman Continental Slope | |
type | Journal Paper | |
journal volume | 46 | |
journal issue | 11 | |
journal title | Journal of Physical Oceanography | |
identifier doi | 10.1175/JPO-D-16-0061.1 | |
journal fristpage | 3321 | |
journal lastpage | 3337 | |
tree | Journal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 011 | |
contenttype | Fulltext |