التفاصيل البيبلوغرافية
| العنوان: |
Transformation of internal solitary waves under ridged ice cover. |
| المؤلفون: |
Terletska, Kateryna, Maderich, Vladimir, Tobisch, Elena |
| المصدر: |
EGUsphere; 9/19/2023, p1-14, 14p |
| مصطلحات موضوعية: |
ICE shelves, MOUNTAIN wave, TURBULENT mixing, ICE, SEA ice, NAVIER-Stokes equations, INTERNAL waves, STRATIFIED flow |
| مصطلحات جغرافية: |
ANTARCTICA |
| مستخلص: |
Internal wave-driven mixing is an important factor in the balance of heat and salt fluxes in the polar regions of the ocean. The breaking internal waves at the edge of the ice cover can essentially enhance the mixing and melting of ice in the Arctic Ocean and Antarctica. The internal solitary waves (ISWs) are generated by various sources, including tidal currents over the bottom topography, the interaction of ice keels with tides, varying in time wind, vortices, and lee waves. In the study, a numerical investigation of the transformation of ISW propagating from open water in the stratified sea under the edge of the ice cover is carried out to compare the depression ISW transformation and loss of energy on smooth ice surfaces, including those on the ice shelf and glacier outlets, with the processes beneath the ridged underside of the ice. They were carried out using a nonhydrostatic model which is based on the Reynolds averaged Navier-Stokes equations in the Boussinesq approximation for a continuously stratified fluid. The Smagorinsky turbulence model extended for stratified fluid was used to explicitly describe the small-scale turbulent mixing. Two series of numerical experiments were carried out in an idealized 2D setup. The first series aimed to study processes of the ISW-depression transformation under ice cover of constant submerged ice thickness. A loss of energy was estimated based on the budget of depth-integrated pseudoenergy before and after the wave transformation. The transformation of depression ISW is controlled by the blocking parameter β. For large positive and large negative values of parameter β which is the ratio of the height of the minimum depth of the upper layer under the ice cover to the incident wave amplitude. The energy loss was relatively small for large positive and large negative values of β. The maximal value of energy loss was about 38 % and it is reached at β ≈ 0 for ISW. In the second series of experiments, a number of keels were located underside of the ice layer of constant thickness. The ISW transformation under ridged ice also depends on the blocking parameter β. For large keels (β<0), more than 40 % is lost on the first keel, while for relatively small keels (β>0.3), the losses on the first keel are less than 6 %. Energy losses due to all keels depend on the distance between them which is characterized by the parameter μ which is the ratio keel depth to the distance between keels. If the tidal flow around the large keels is the source of internal waves, then under conditions of strongly ridged ice the waves excited by the tidal flow are dispersed in the vicinity of their formation. [ABSTRACT FROM AUTHOR] |
|
Copyright of EGUsphere is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |