hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Sciences10.59887/2073-6673.2024.17(4)-1hydrophysics-1378Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESТрансформация мезомасштабных океанических вихрей в филаменты: анализ данных альтиметрииEvolution of mesoscale vortices in the ocean into filaments inferred from altimeter datahttps://orcid.org/0000-0001-8217-0932ЖмурВ. В.ZhmurV. V.

199034, Университетская наб., д. 7–9, г. Санкт-Петербург

117997, Нахимовский проспект, д. 36, г. Москва

141701, Институтский пер., 9, г. Долгопрудный, Московская область

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

zhmur-vladimir@mail.ruhttps://orcid.org/0000-0003-4608-7781БелоненкоТ. В.BelonenkoT. V.

199034, Университетская наб., д. 7–9, г. Санкт-Петербург

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

btvlisab@yandex.ruhttps://orcid.org/0000-0002-6319-8937НовоселоваЕ. В.NovoselovaE. V.

199034, Университетская наб., д. 7–9, г. Санкт-Петербург

199034, 14 линия В.О., д. 7, г. Санкт-Петербург

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

novoselovaa.elena@gmail.comСуетинБ. П.SuetinB. P.

141701, Институтский пер., 9, г. Долгопрудный, Московская область

Suetin, Boris P., Postgraduate student

Scopus AuthorID: 58153398500

9 Institutskiy per., Dolgoprudny, Moscow Region, 141701

suetinboris@gmail.comСанкт-Петербургский государственный университет; Институт океанологии им. П.П. Ширшова РАН; Московский физико-технический институт (национальный исследовательский университет)РоссияSt. Petersburg State University; Shirshov Institute of Oceanology, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)Russian FederationСанкт-Петербургский государственный университетРоссияSt. Petersburg State UniversityRussian FederationСанкт-Петербургский государственный университет; Научный фонд «Международный центр по окружающей среде и дистанционному зондированию имени Нансена»РоссияSt. Petersburg State University; Nansen International Environmental and Remote Sensing Center Scientific FoundationRussian FederationМосковский физико-технический институт (национальный исследовательский университет)РоссияMoscow Institute of Physics and Technology (National Research University)Russian Federation202408012025174831Copyright © Жмур В.В., Белоненко Т.В., Новоселова Е.В., Суетин Б.П., 20252025Жмур В.В., Белоненко Т.В., Новоселова Е.В., Суетин Б.П.Zhmur V.V., Belonenko T.V., Novoselova E.V., Suetin B.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/1378

Спутниковые данные дистанционного зондирования предоставляют обширный массив оптических, инфракрасных (ИК) и радиолокационных изображений поверхности океана, на которых видны многочисленные вытянутые вихревые структуры — филаменты. Их высокая контрастность на изображениях обусловлена наличием поверхностно-активных пленок и/или скоплений водорослей. Из-за вытянутой формы филаменты трудно отличить от вихрей с помощью автоматизированных методов идентификации. Однако и филаменты, и вихри характеризуются высокой относительной завихренностью и кинетической энергией. Трансформация вихрей в филаменты обусловлена взаимодействием с неоднородными фоновыми течениями. В данном исследовании применяется теоретическая модель растяжения мезомасштабных океанических вихрей к реальным данным альтиметрии. Цель исследования — оценить долю мезомасштабных вихрей, претерпевающих растяжение и трансформирующихся в филаменты, что приводит к перераспределению энергии с мезомасштаба на субмезомасштаб. Оценивается глобальное пространственное распределение областей с неограниченным и ограниченным растяжением мезомасштабных вихрей и интерпретируются полученные результаты. Уменьшение энергии вихрей за счет растяжения, вызванного фоновым потоком, рассматривается как потенциальный механизм передачи энергии от вихря к потоку, что может проявляться в виде эффекта отрицательной вязкости.

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.

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The authors declare that there are no conflicts of interest present.