Manifestation of sub mesoscale marine eddies in the structure of surface slick bands

Olga V. Shomina; Tatiana V. Tarasova; Olga A. Danilicheva; Ivan A. Kapustin

doi:10.1117/12.2572703

20 September 2020 Manifestation of sub mesoscale marine eddies in the structure of surface slick bands

Olga V. Shomina, Tatiana V. Tarasova, Olga A. Danilicheva, Ivan A. Kapustin

Proceedings Volume 11529, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2020; 115290H (2020) https://doi.org/10.1117/12.2572703
Event: SPIE Remote Sensing, 2020, Online Only

Conference Poster

Abstract

Traditionally spiral slick structure is interpreted as a manifestation of marine eddy, which length scale is taken equal to the scale of spiral. This approach is based on the assumption that wind has no effect on the kinematics of forming slick bands which, according to our estimation, is incorrect in real sea conditions. This can lead to misinterpretation of remote sensing data in the field of definition of the characteristics of marine eddies, particularly, in radar images. The system of equations for the description of kinematics of a Lagrangian particle (element of surface active substance) in stationary fields of axisymmetric eddy with non-zero radial velocity component and homogeneous wind was obtained. It was shown that the center of the spiral is not collocated with the center of the eddy, and the distance between them can achieve the scale of eddy core. It was shown that the displacement of the spiral center is quasi perpendicular to the wind direction in case of small radial velocity component compared to the tangential one. It was shown analytically that there is a threshold wind velocity which corresponds to the breakdown of the spiral structure. Simulation based on the discrete-time approximation of particle trajectories, as well as radar observation of marine eddies, demonstrates the possibility of appearance of a “focus” and a “saddle” in the characteristic shape of slick bands. The perspectives of correct retrieval of length scales and character velocities of observed sub mesoscale marine eddies are discussed.

Citation Download Citation

Olga V. Shomina, Tatiana V. Tarasova, Olga A. Danilicheva, and Ivan A. Kapustin "Manifestation of sub mesoscale marine eddies in the structure of surface slick bands", Proc. SPIE 11529, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2020, 115290H (20 September 2020); https://doi.org/10.1117/12.2572703

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