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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">hydrophysics</journal-id><journal-title-group><journal-title xml:lang="ru">Фундаментальная и прикладная гидрофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Fundamental and Applied Hydrophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-6673</issn><issn pub-type="epub">2782-5221</issn><publisher><publisher-name>St. Petersburg Research Center of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.7868/S2073667320030028</article-id><article-id custom-type="elpub" pub-id-type="custom">hydrophysics-111</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>HYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSES</subject></subj-group></article-categories><title-group><article-title>О нелинейной динамике линз средиземноморской воды «медди»</article-title><trans-title-group xml:lang="en"><trans-title>On Nonlinear Dynamics of Meddies</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бенилов</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Benilov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нью Джерси</p></bio><bio xml:lang="en"><p>130 Marina Bay Court, Highlands, NJ 07732</p></bio><email xlink:type="simple">abenilov@rocketmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сафрай</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Safray</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117997, Нахимовский пр., д. 36, г. Москва</p></bio><bio xml:lang="en"><p>117997, Nahimovsky Prospekt, 36, Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Филюшкин</surname><given-names>Б. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Filyushkin</surname><given-names>B. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117997, Нахимовский пр., д. 36, г. Москва</p></bio><bio xml:lang="en"><p>117997, Nahimovsky Prospekt, 36, Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кожелупова</surname><given-names>Н. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kojelupova</surname><given-names>N. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117997, Нахимовский пр., д. 36, г. Москва</p></bio><bio xml:lang="en"><p>117997, Nahimovsky Prospekt, 36, Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Лаборатория прикладной физики моря, Компания «Экъют Солюшэнс»</institution><country>Соединённые Штаты Америки</country></aff><aff xml:lang="en"><institution>Applied Marine Physics Lab, Acute Solutions</institution><country>United States</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт океанологии им. П.П. Ширшова РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Shirshov Institute of Oceanology RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>03</day><month>12</month><year>2021</year></pub-date><volume>13</volume><issue>3</issue><fpage>20</fpage><lpage>42</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бенилов А.Ю., Сафрай А.С., Филюшкин Б.Н., Кожелупова Н.Г., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Бенилов А.Ю., Сафрай А.С., Филюшкин Б.Н., Кожелупова Н.Г.</copyright-holder><copyright-holder xml:lang="en">Benilov A.Y., Safray A.S., Filyushkin B.N., Kojelupova N.G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://hydrophysics.spbrc.ru/jour/article/view/111">https://hydrophysics.spbrc.ru/jour/article/view/111</self-uri><abstract><p>Линзы средиземноморской воды, также известные как «медди», хорошо различимы в воде Атлантического океана. Полевые наблюдения, посвященные изучению «медди», представлены в многочисленных публикациях и предоставляют информацию об их происхождении, распределении, пространственных масштабах и динамической активности во времени. Солевые пальцы и двойная диффузия на верхних и нижних границах «медди» могут рассматриваться как единственные механизмы, вызывающие исчезновение «медди», как мезомасштабные термально-соленые неоднородности в окружающих водах Атлантического океана. Принимая во внимание реалистичные масштабы «медди», показано, что во временных масштабах около или менее года масса воды «медди» может считаться неизменной. Отсюда следует, что на временных масштабах менее или порядка года для «медди» справедлив закон сохранения их полной массы.Анализ временной изменчивости «медди» проводится с использованием теоретического подхода для интрузионной линзы в стратифицированной жидкости, расширенного учётом силы Кориолиса. Центр тяжести рассматриваемых «медди» находится на уровне равной плотности. Временная изменчивость возникает из-за результирующего воздействия набора сил: избыточного давления, возникающего из-за разницы в плотности воды внутри линз средиземноморской воды и плотности окружающей среды; сил, возникающих как из-за вращения линзы (центробежная сила), так и вращения Земли (сила Кориолиса); сил, вызванных излучением внутренней волны и действием вязкости. Временная изменчивость линз средиземноморской воды состоит из двух основных этапов:1) начальная, невязкая стадия («молодая линза»), когда баланс сил формируется силами инерции, избыточного давления, центробежной силы, силы Кориолиса и силы волнового сопротивления, вызванного излучением внутренней волны; сила Кориолиса является ключевым фактором, поддерживающим и сохраняющим компактность антициклонических линз средиземноморской воды, «медди»; она предотвращает разрушение линз средиземноморской воды, ограничивает их геометрические размеры, влияет на изменение угловой скорости линзы. Циклонические линзы средиземноморской воды дестабилизируются силой Кориолиса, их толщина уменьшается со временем, и при определенных условиях линзы средиземноморской воды могут исчезнуть как аномалии плотности уже на этой стадии;2) стадия вязкости («старая линза») характеризуется медленным уменьшением толщины линз средиземноморской воды до ее предельного значения, которое определяется начальной толщиной и начальной стратификацией линз средиземноморской воды, а также стратификацией окружающей среды; в течение последнего периода вязкой стадии обмен теплом и соленостью с окружающей водной массой может, на характерных временных масштабах около года, существенно влиять на вырождение линз средиземноморской воды как аномалии плотности; на этой стадии антициклонические линзы средиземноморской воды, «медди», продолжают иметь антициклоническое вращение.</p></abstract><trans-abstract xml:lang="en"><p>The lenses of the Mediterranean water (LMW), also known as Meddies, well distinguishable in the Atlantic Ocean water. The field observations devoted to study Meddies are presented in numerous publications and provide information on their origination, distribution, spatial scales and temporal dynamic activities. The salt-fingers and double-diffusion at the Meddies top and bottom borders may be considered as only mechanisms causing the Meddies disappearance as the thermal — saline mesoscale anomalies in the surrounding Atlantic Ocean waters. Taking into account the Medies’ realistic scales it is shown that in temporal scales of about and less than a year the Meddies water mass may be considered as invariable. Then the Meddies conservation mass is valid in such temporal scales.The Meddies (LMW) temporal variability analysis is carried out using the theoretical approach of intrusive lens in stratified fluid extended taking into account the Coriolis force. The Meddies (LMW) are considered with the center of gravity sitting at the level of equal density. The temporal variability occurs due to the resulting effect of the set of forces: the surplus pressure originated due to the density difference between the water inside the LMW and the ambient density field; the forces originated due to both the lens’ rotation (centrifugal) and the Earth rotation (Coriolis); the forces caused by the internal wave radiation and the viscosity action. The temporal variability of LMW constitutes of two principal stages:1) the initial, inviscid stage (“young lens”), when balance of forces is formed by the forces of inertia, the surplus pressure, the centrifugal force, the Coriolis force and the force of wave resistance due to the internal wave radiation; the Coriolis force is a key factor supporting and keeping compact the anti-cyclonic LMW, the Meddies; it prevents the LMWs from breakup, limits their geometrical dimensions, affects the lens angular velocity variations. The cyclonic LMWs are destabilized by the Coriolis force, getting small thickness and under certain conditions may disappear as a density anomaly already at this stage;2) the viscid stage (“old lens”) is characterized by a slow decreasing of the LMW thickness up to its limit value, that is determined by the LMW initial thickness, the initial LMW stratification as well as ambient stratification; during the final period of the viscous stage the exchange of heat and salinity with ambient water-mass may, on a characteristic temporal scales about a year, significantly influence on the degenerations of the LMW as a density anomaly; at this stage the anti-cyclonic LMW, the Meddy, continues to have the anti-cyclonic rotation.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>линзы средиземноморской воды</kwd><kwd>«медди»</kwd><kwd>временная изменчивость</kwd><kwd>теоретический подход</kwd><kwd>невязкая стадия</kwd><kwd>сила Кориолиса</kwd><kwd>вязкая стадия</kwd><kwd>стратификация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>lenses of the Mediterranean water</kwd><kwd>Meddies</kwd><kwd>temporal variability</kwd><kwd>theoretical approach</kwd><kwd>inviscid stage</kwd><kwd>Coriolis force</kwd><kwd>visid stage</kwd><kwd>stratification</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This research was performed in the framework of the state assignment (theme No. 0149–2019–0015).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Yan Xiao-Hai, Young-Heon Jo, W. 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