Mechanism of ice-band pattern formation caused by resonant interaction between sea ice and internal waves in a continuously stratified ocean

2021 ◽  
Vol 190 ◽  
pp. 102474
Author(s):  
Ryu Saiki ◽  
Humio Mitsudera ◽  
Ayumi Fujisaki-Manome ◽  
Noriaki Kimura ◽  
Jinro Ukita ◽  
...  
Keyword(s):  
Pattern Formation ◽  
Sea Ice ◽  
Internal Waves ◽  
Resonant Interaction ◽  
Band Pattern ◽  
Stratified Ocean

scholarly journals A Mechanism of Ice-Band Pattern Formation Caused by Resonant Interaction between Sea Ice and Internal Waves: A Theory

2016 ◽  
Vol 46 (2) ◽  
pp. 583-600 ◽  
Author(s):  
Ryu Saiki ◽  
Humio Mitsudera
Keyword(s):  
Pattern Formation ◽  
Sea Ice ◽  
Internal Waves ◽  
Gravity Waves ◽  
Wind Direction ◽  
Propagation Direction ◽  
Band Pattern ◽  
Band Spacing ◽  
Internal Inertia ◽  
Inertia Gravity Waves

AbstractIce bands are frequently observed over marginal ice zones in polar seas. A typical ice-band pattern has a regular spacing of about 10 km and extends over 100 km in the marginal ice zone. Further, the long axis of an ice band lies to the left (right) with respect to the wind direction in the Northern (Southern) Hemisphere. Here, the study shows that the resonance between ice-band pattern propagation and internal inertia–gravity waves below the sea ice well explains the ice-band pattern formation. Internal waves are generated by the difference between the stress on the open water and the stress on ice-covered water. This in turn reinforces the formation of an ice-band pattern with a regular band spacing. Specifically, the authors have found the following: 1) A band spacing on the order of 10 km is selected by the resonance condition in which the ice-band pattern propagation speed coincides with the phase speed of internal inertia–gravity waves. 2) The ice bands tend to develop favorably when the wind direction and the band propagation direction are nearly parallel. The velocity acceleration caused by the periodic differential stress associated with the ice bands, driven by the wind parallel to the band propagation direction, is important. The wind direction may turn to the left (right) slightly in the Northern (Southern) Hemisphere as a result of the Coriolis force acting on ice. Satellite images confirmed that the band spacing of the ice-band pattern in the polar seas is consistent with this theory.

The Coordinated Eastern Arctic Experiment: SPRI sea-ice studies

Polar Record ◽  
1990 ◽  
Vol 26 (158) ◽  
pp. 203-210 ◽  
Author(s):  
R. G. Williams ◽  
N. R. Davis ◽  
S. C. Moore
Keyword(s):  
Time Series ◽  
Sea Ice ◽  
Strong Coupling ◽  
Time Scales ◽  
Internal Waves ◽  
Naval Research ◽  
Coupling Mechanism ◽  
Office Of Naval Research ◽  
Polar Research Institute ◽  
Horizontal Strain

AbstractDuring March and April 1989 a two-man team from the Scott Polar Research Institute (SPRI) and Science Applications International Corporation (SAIC) took part in the oceanography ice camp phase of the Office of Naval Research-sponsored Coordinated Eastern Arctic Experiment (CEAREX). The aim of the experiment was to measure with strainmeters and tiltmeters the interaction between oceanic internal waves and sea ice. Arrays of these instruments were deployed to measure horizontal strain and vertical tilt fields continuously over a 29-day period. The resulting time series show quite clearly internal wavelike activity indicating that a strong coupling mechanism exists. Other interesting phenomena are evident in the data with timę-scales varying from seconds to several days.

NLS equation of internal waves in weakly stratified ocean

1996 ◽  
Vol 14 (2) ◽  
pp. 121-127
Author(s):  
Xu Zhao-ting ◽  
Lou Shun-li ◽  
Tian Ji-wei ◽  
Samuel Shan-pu Shen
Keyword(s):  
Internal Waves ◽  
Nls Equation ◽  
Stratified Ocean

scholarly journals Interaction Features of Internal Wave Breathers in a Stratified Ocean

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 205
Author(s):  
Ekaterina Didenkulova ◽  
Efim Pelinovsky
Keyword(s):  
Internal Wave ◽  
Internal Waves ◽  
Gravity Waves ◽  
Fourth Order ◽  
Numerical Experiments ◽  
Vries Equation ◽  
Internal Gravity Waves ◽  
Wave Fields ◽  
Tidal Waves ◽  
Stratified Ocean

Oscillating wave packets (breathers) are a significant part of the dynamics of internal gravity waves in a stratified ocean. The formation of these waves can be provoked, in particular, by the decay of long internal tidal waves. Breather interactions can significantly change the dynamics of the wave fields. In the present study, a series of numerical experiments on the interaction of breathers in the frameworks of the etalon equation of internal waves—the modified Korteweg–de Vries equation (mKdV)—were conducted. Wave field extrema, spectra, and statistical moments up to the fourth order were calculated.

scholarly journals Year-round observations of sea-ice drift and near-inertial internal waves in the Northwind Abyssal Plain, Arctic Ocean

Polar Science ◽  
2019 ◽  
Vol 21 ◽  
pp. 212-223 ◽  
Author(s):  
Yusuke Kawaguchi ◽  
Motoyo Itoh ◽  
Yasushi Fukamachi ◽  
Erika Moriya ◽  
Jonaotaro Onodera ◽  
...  
Keyword(s):  
Sea Ice ◽  
Arctic Ocean ◽  
Internal Waves ◽  
Abyssal Plain ◽  
Ice Drift ◽  
Sea Ice Drift

Interfacial generation of internal waves and turbulent heat flux due to enhanced inertial motion for deformed sea-ice floe: Preliminary results from MOSAiC expedition

2021 ◽  
Author(s):  
Yusuke Kawaguchi ◽  
Zoe Koenig ◽  
Mario Hoppman ◽  
Daiki Nomura ◽  
Mats Granskog ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Sea Ice ◽  
Internal Waves ◽  
Inertial Motion ◽  
Eddy Heat Flux ◽  
Ice Drift ◽  
Ice Floes ◽  
Ocean Boundary ◽  
Perennial Ice

<p>Sea-ice drift becomes most energetic at last moment in summer when refreezing is about to onset. Perennial ice floes, surviving over all seasons, tend to experience a number of deformation events over yearlong drift, with uneven distribution in thickness. Deformed ice floes protrude tall keels into water of ice-ocean boundary, and then stir it up. Consequently, combination of fast ice drift and deformation-experienced perennial ice could be a primary source of momentum/thermal energy for upper waters through propagation of internal waves. In this study, during MOSAiC expedition, we attempted to perform direct observation of wave generation in ice-ocean boundary layer underneath a drifting ice floe in the central Arctic Ocean. Time series of turbulent signals, represented by Reynolds stress <u'w'> and eddy heat flux <w'T'>, were obtained by an eddy covariance system (ECS), coupling a high-frequency (34 Hz) single-point current meter and a temperature sensor. Vertical/temporal properties of near-inertial waves were obtained by a downward-looking ADCP, collocated with ECS on the same ice floe. At same time, a triangle of high-precision GPS systems tracked ice movement to represent mean drift speed, rotation and deformation about the same floe seamlessly in time. Preliminary analyses of those combined data suggested that pronounced signals of inertial motion occurred in early September of 2020 as sheer ice keels dragged underlying waters, stratified by accumulation of melt water. It then allowed occurrence of near-inertial internal waves that tend to be trapped within the interfacial boundary layer, located within top 20 m. At the conference, we will present latest and quantitative knowledges from the MOSAiC expedition.</p>

On the damping of internal gravity waves in a continuously stratified ocean

1966 ◽  
Vol 25 (1) ◽  
pp. 121-142 ◽  
Author(s):  
Paul H. LeBlond
Keyword(s):  
Internal Waves ◽  
Gravity Waves ◽  
Internal Gravity Waves ◽  
Bottom Friction ◽  
Internal Tides ◽  
Attenuation Rate ◽  
Mixing Coefficients ◽  
Stratified Ocean ◽  
Shallow Seas ◽  
Strongly Damped

The problem studied here is that of the attenuation of internal waves through turbulent mixing in a weakly and exponentially stratified fluid. The equations are linearized and it is assumed that the action of turbulence can be parametrically represented by eddy mixing coefficients and that the influence of bottom friction is restricted to a thin bottom boundary layer. The simple case where there is no rotation and only one component to the stratification is first examined in detail, and the modifications caused by introducing rotation and a second component are subsequently investigated. Subject quantitatively to the choice made for the eddy coefficients, but qualitatively not strongly dependent on that choice, the following conclusions are drawn: (i) very short internal waves (length < 100 m) are strongly damped in basins of all depths; (ii) long internal waves or seiches in shallow seas (depth ≃ 100 m) will not last more than a few cycles as free oscillations; (iii) the attenuation rate for long internal tides is small enough that these should be observable very far from the coasts, but large enough to exclude the possibility of oceanic standing wave systems; (iv) for very long internal waves the damping is predominantly due to the effect of bottom friction, and the attenuation rate becomes almost independent of the actual form of the stratification present in the fluid.

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