Comparing the effects of internal waves, mode coupling, and change in bandwidth of a radiated signal on low mode energy propagation.

2009 ◽  
Vol 125 (4) ◽  
pp. 2492-2492
Author(s):  
Natalie Grigorieva ◽  
Gregory Fridman ◽  
James Mercer ◽  
Rex Andrew ◽  
Michael Wolfson ◽  
...  
Keyword(s):  
Internal Waves ◽  
Mode Coupling ◽  
Energy Propagation ◽  
Mode Energy

scholarly journals Enhanced Diapycnal Mixing due to Near-Inertial Internal Waves Propagating through an Anticyclonic Eddy in the Ice-Free Chukchi Plateau

2016 ◽  
Vol 46 (8) ◽  
pp. 2457-2481 ◽  
Author(s):  
Yusuke Kawaguchi ◽  
Shigeto Nishino ◽  
Jun Inoue ◽  
Katsuhisa Maeno ◽  
Hiroki Takeda ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Arctic Ocean ◽  
Internal Waves ◽  
Relative Vorticity ◽  
Anticyclonic Eddy ◽  
The Arctic ◽  
Buoyancy Frequency ◽  
Energy Propagation ◽  
Microstructure Observation ◽  
Chukchi Plateau

AbstractThe Arctic Ocean is known to be quiescent in terms of turbulent kinetic energy (TKE) associated with internal waves. To investigate the current state of TKE in the seasonally ice-free Chukchi Plateau, Arctic Ocean, this study performed a 3-week, fixed-point observation (FPO) using repeated microstructure, hydrographic, and current measurements in September 2014. During the FPO program, the microstructure observation detected noticeable peaks of TKE dissipation rate ε during the transect of an anticyclonic eddy moving across the FPO station. Particularly, ε had a significant elevation in the lower halocline layer, near the critical level, reaching the order of 10−8 W kg−1. The ADCP-measured current displayed energetic near-inertial internal waves (NIWs) propagating via the stratification at the top and bottom of the anticyclone. According to spectral analyses of horizontal velocity, the waves had almost downward energy propagation, and its current amplitude reached ~10 cm s−1. The WKB scaling, incorporating vertical variations of relative vorticity, suggests that increased wave energy near the two pycnoclines was associated with diminishing group velocity at the corresponding depths. The finescale parameterization using observed near-inertial velocity and buoyancy frequency successfully reproduced the characteristics of observed ε, supporting that the near-inertial kinetic energy can be effectively dissipated into turbulence near the critical layer. According to a mixed layer slab model, a rapidly moving storm that has passed over in the first week likely delivered the bulk of NIW kinetic energy, eventually captured by the vortex, into the surface water.

Sound fluctuations resulting from mode coupling in shallow-water internal waves

2014 ◽  
Vol 60 (3) ◽  
pp. 287-296 ◽  
Author(s):  
V. A. Grigor’ev ◽  
B. G. Katsnel’son
Keyword(s):  
Shallow Water ◽  
Internal Waves ◽  
Mode Coupling

Acoustic mode coupling effects from propagation through nonlinear internal waves

2004 ◽  
Vol 116 (4) ◽  
pp. 2535-2535
Author(s):  
Laurel K. Reilly‐Raska ◽  
James F. Lynch ◽  
John A. Colosi ◽  
William L. Siegmann
Keyword(s):  
Internal Waves ◽  
Mode Coupling ◽  
Acoustic Mode ◽  
Coupling Effects ◽  
Nonlinear Internal Waves

scholarly journals Generation of mode 2 internal waves by the interaction of mode 1 waves with topography

2019 ◽  
Vol 880 ◽  
pp. 799-830 ◽  
Author(s):  
Zihua Liu ◽  
Roger Grimshaw ◽  
Edward Johnson
Keyword(s):  
Internal Waves ◽  
Mode Coupling ◽  
Wave Amplitude ◽  
Fluid Model ◽  
Wave Theory ◽  
Topographic Slope ◽  
Long Wave ◽  
Mode 2 ◽  
Generation Mechanisms ◽  
Infinite Set

Oceanic internal waves can be decomposed into an infinite set of modes, and the dominant internal mode 1 waves have been extensively investigated. Although mode 2 waves have been observed, they have not received comparable attention, especially the generation mechanisms. In this work, we examine the generation of mode 2 internal waves by the interaction of mode 1 waves with topography. We use a coupled linear long-wave theory with mode coupling through topography, combined with evolution using a Korteweg–de Vries model, to predict the mode 2 wave amplitude, in an ideal three-layer fluid model, in a smooth density stratification and in two realistic oceanic settings. We find that the mode 2 wave amplitude is usually much smaller than the incident mode 1 wave amplitude and is quite sensitive to the pycnocline thickness, topographic slope and background stratification.

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