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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">PHYSICAL OCEANOGRAPHY</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">PHYSICAL OCEANOGRAPHY</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Морской гидрофизический журнал</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="print">0233-7584</issn>
   <issn publication-format="online">1573-160X</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">106367</article-id>
   <article-id pub-id-type="edn">WNMFEK</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>ЭКСПЕРИМЕНТАЛЬНЫЕ И ЭКСПЕДИЦИОННЫЕ ИССЛЕДОВАНИЯ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>EXPERIMENTAL AND EXPEDITIONAL RESEARCH</subject>
    </subj-group>
    <subj-group>
     <subject>ЭКСПЕРИМЕНТАЛЬНЫЕ И ЭКСПЕДИЦИОННЫЕ ИССЛЕДОВАНИЯ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Vertical Mixing in the Lower Part of Main Pycnocline  in the Black Sea</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Вертикальное перемешивание в нижней части основного пикноклина Черного моря</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9022-3379</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Морозов</surname>
       <given-names>Алексей Николаевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Morozov</surname>
       <given-names>Aleksey Nikolaevich</given-names>
      </name>
     </name-alternatives>
     <email>anmorozov@mhi-ras.ru</email>
     <bio xml:lang="ru">
      <p>кандидат технических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of technical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Морской Гидрофизический Институт РАН</institution>
     <city>Sevastopol’</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Marine Hydrophysical Institute RAS</institution>
     <city>Sevastopol’</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2025-07-11T00:00:00+03:00">
    <day>11</day>
    <month>07</month>
    <year>2025</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2025-07-11T00:00:00+03:00">
    <day>11</day>
    <month>07</month>
    <year>2025</year>
   </pub-date>
   <volume>41</volume>
   <issue>5</issue>
   <fpage>586</fpage>
   <lpage>598</lpage>
   <history>
    <date date-type="received" iso-8601-date="2024-11-07T00:00:00+03:00">
     <day>07</day>
     <month>11</month>
     <year>2024</year>
    </date>
    <date date-type="accepted" iso-8601-date="2025-02-18T00:00:00+03:00">
     <day>18</day>
     <month>02</month>
     <year>2025</year>
    </date>
   </history>
   <self-uri xlink:href="https://mhi-ras.editorum.ru/en/nauka/article/106367/view">https://mhi-ras.editorum.ru/en/nauka/article/106367/view</self-uri>
   <abstract xml:lang="ru">
    <p>Цель. Оценка коэффициента вертикальной турбулентной диффузии в нижней части основного пикноклина в районе континентального склона и в глубоководной зоне Черного моря – цель настоящей работы.&#13;
Методы и результаты. Использованы данные, собранные в 87-м рейсе НИС «Профессор Во-дяницкий», проходившем в центральном секторе северной части Черного моря с 30 июня по 18 июля 2016 г. Профили температуры, солености и скорости течения измерялись CTD/LADCP-зондами. Предложен способ применения параметризации G03 для слоя толщиной ~ 200 м между изопикнами со значениями условной плотности 15,5 и 16,8 кг/м3. Для подавления шумов изме-рения использовались изопикническое осреднение по ансамблю станций и аппроксимация ре-зультирующих профилей параметров степенными функциями. Различие передаточных функций обработки CTD- и LADCP-данных учитывалось при интегрировании канонического спектра внутренних волн. По данным 20 глубоководных станций получен изопикнически осредненный профиль частоты плавучести, демонстрирующий слои ее степенной и экспоненциальной зависи-мости от глубины. Детально с представлением графического материала обсуждаются методиче-ские вопросы применения параметризации G03 в нижней части основного пикноклина Черного моря. Профили коэффициента вертикальной турбулентной диффузии   показывают его почти постоянное значение ~ 210−6 м2/с в районе континентального склона и линейное возраста-ние с глубиной от 110−6 до 210−6 м2/с в глубоководной части моря. Максимальное значение рассчитанных потоков тепла составляет 12 мВт/м2, что подтверждает их незначительное влияние на прогрев холодного промежуточного слоя. Поток соли на верхней границе слоя в районе кон-тинентального склона составил 610−5 г/(м2с), в глубоководной части моря ~ 310−5 г/(м2с). На нижней границе слоя потоки соли почти одинаковы для двух районов, они составили ~ 510−6 г/(м2с). Отношение сдвиг/деформация проявляет резкое увеличение с глубиной и подчеркивает значительное различие природы мелкомасштабных процессов на границах нижней части основ-ного пикноклина.&#13;
Выводы. Оценка коэффициента вертикальной турбулентной диффузии с применением парамет-ризации G03 хорошо согласуется со значениями, полученными в других районах моря по дан-ным микроструктурных зондов. Вопрос сопоставимости оценок тем не менее остается открытым и требует проведения синхронных измерений микроструктурными и CTD/LADCP-зондами.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Purpose. The purpose of the study is to assess the vertical turbulent diffusion coefficient in the lower part of main pycnocline in the areas of continental slope and deep part of the Black Sea. &#13;
Methods and Results. The data collected during the 87th cruise of R/V “Professor Vodyanitsky” which was conducted in the central sector of the northern Black Sea from June 30 to July 18 in 2016, are used. The profiles of temperature, salinity and current velocity were measured by CTD/LADCP probes. A method for applying the G03 parameterization to the ~ 200 m thickness layer located between the iso-pycns with conditional density 15.5 and 16.8 kg/m3 is proposed. To suppress measurement noise, the isopycnal averaging over the station ensemble as well as the approximation of the resulting parameter profiles by power functions are applied. The difference between the transfer functions of CTD and LADCP data processing is taken into account when integrating the canonical spectrum of internal waves. The data from 20 deep-sea stations permitted to obtain the buoyancy frequency profile averaged over the isopycns, which demonstrated the layers of its power and exponential dependences on depth. The methodological problems in applying the G03 parameterization to the lower part of the Black Sea main pycnocline are discussed in detail including the graphic presentation of data. The profiles of verti-cal turbulent diffusion coefficient   show its almost constant value of ~ 210-6 m2/s in the region of continental slope and its linear increase with depth from 110-6 m2/s to 210-6 m2/s in the deep part of the sea. The maximum value of calculated heat fluxes reaches 12 mW/m2 and confirms their insignificant effect on the heating of cold intermediate layer. The salt flux at the layer upper boundary in the area of continental slope is 610-5 g/(m2s) and in the deep part of the sea – ~ 310-5 g/(m2s). At the layer lower boundary, the salt fluxes are almost the same for both areas and constitute ~ 510-6 g/(m2s). As for the shear-to-strain ratio, its sharp increase with depth is evident, and a significant difference in the nature of small-scale processes at the boundaries of lower part of the main pycnocline is clearly pronounced.&#13;
Conclusions. The estimate of vertical turbulent diffusion coefficient obtained using the G03 parameteri-zation is in good agreement with the values resulted from the microstructural sounding in other sea re-gions. However, the issue of comparability of the estimates remains open and requires synchronous measurements with microstructural and CTD/LADCP probes.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Черное море</kwd>
    <kwd>основной пикноклин</kwd>
    <kwd>вертикальное турбулентное перемешивание</kwd>
    <kwd>Основное Черноморское течение</kwd>
    <kwd>сдвиг скорости течения</kwd>
    <kwd>деформация</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Black Sea</kwd>
    <kwd>main pycnocline</kwd>
    <kwd>vertical turbulent mixing</kwd>
    <kwd>Rim Current</kwd>
    <kwd>current velocity shear</kwd>
    <kwd>strain</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">работа выполнена в рамках темы государственного задания ФГБУН ФИЦ МГИ FNNN-2024-0012 «Оперативная океанология».</funding-statement>
    <funding-statement xml:lang="en">The study was carried out within the framework of theme of state assignment of FSBSI FRC MHI FNNN-2024-0012 “Operational Oceanology”</funding-statement>
   </funding-group>
  </article-meta>
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