Evolution of mesoscale vortices in the ocean into filaments inferred from altimeter data
https://doi.org/10.59887/2073-6673.2024.17(4)-1
Abstract
Satellite remote sensing techniques offer a wealth of optical, infrared (IR), and radar images of the ocean surface, where we can observe numerous elongated vortex structures known as filaments. These filaments become readily visible in the imagery due to the presence of surfactant films and/or floating algae clusters on the sea’s surface. Given their elongated form, automated vortex identification methods do not readily distinguish filaments from vortices. Nevertheless, both filaments and vortices exhibit notable characteristics such as high relative vorticity and kinetic energy. The process by which vortices transform into filaments is a result of their interaction with spatially non-uniform background currents. In this study, we apply the theoretical principles regarding the stretching of mesoscale ocean vortices to real ocean conditions, inferred from altimeter data. The primary objective of this research is to assess the proportion of mesoscale ocean vortices that undergo stretching to become filaments, consequently facilitating the redistribution of energy from the mesoscale to the submesoscale. We provide a total assessment of the portion of the World Ocean’s surface where mesoscale vortices undergo significant stretching. We present maps that indicate the geographical distribution of regions where vortex stretching is not restricted and offer an interpretation of the findings. The reduction in the inherent energy of vortices due to the stretching induced by the background flow is explained as a potential mechanism for energy transfer from the vortex to the flow, possibly leading to the manifestation of the negative viscosity effect within this system.
Supporting agencies: Theoretical aspects of this research were developed under the auspices of the Institute of Oceanology of the Russian Academy of Sciences (State Assignment No. FMWE-2024-0016). Computational work was supported by St. Petersburg University (Grant No. 116442164). Figure generation and analysis of vortex evolution were supported by the Russian Science Foundation (Grant No. 24-77-00063; https://rscf.ru/project/24-77-00063/).
About the Authors
V. V. Zhmur
St. Petersburg State University; Shirshov Institute of Oceanology, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)
Russian Federation
Russian Federation
Zhmur, Vladimir V., Head of the Laboratory, Chief Researcher, Dr. Sc. (Phys.-Math.), Corresponding Member of the Russian Academy of Sciences
WoS ResearcherID: P-9738-2015, Scopus AuthorID: 6602162918
7–9 Universitetskaya Emb., St. Petersburg, 199034
36 Nakhimovsky Prosp., Moscow, 117997
9 Institutskiy per., Dolgoprudny, Moscow Region, 141701
T. V. Belonenko
St. Petersburg State University
Russian Federation
Russian Federation
Belonenko, Tatyana V., Professor of the Department of Oceanology
Scopus Author ID: 6507005889, WoS ResearcherID: K-2162-2013
7–9 Universitetskaya Emb., St. Petersburg, 199034
E. V. Novoselova
St. Petersburg State University; Nansen International Environmental and Remote Sensing Center Scientific Foundation
Russian Federation
Russian Federation
Novoselova, Elena V., Researcher
WoS ResearcherID: AAZ-6650-2020, Scopus AuthorID: 57219992097
7–9 Universitetskaya Emb., St. Petersburg, 199034
7 Line 14 V.O., St. Petersburg, 199034
B. P. Suetin
Moscow Institute of Physics and Technology (National Research University)
Russian Federation
Russian Federation
Suetin, Boris P., Postgraduate student
Scopus AuthorID: 58153398500
9 Institutskiy per., Dolgoprudny, Moscow Region, 141701
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Zhmur V.V., Belonenko T.V., Novoselova E.V., Suetin B.P. Evolution of mesoscale vortices in the ocean into filaments inferred from altimeter data. Fundamental and Applied Hydrophysics. 2024;17(4):8-31. https://doi.org/10.59887/2073-6673.2024.17(4)-1
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