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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Дальневосточного отделения Российской академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-7698</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">688926</article-id><article-id pub-id-type="doi">10.31857/S0869769825030032</article-id><article-id pub-id-type="edn">PLSSRC</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Earth and Environment Sciences</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Науки о Земле и окружающей среде</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Methane flows at the water–atmosphere interface in the South China Sea according to the results of expeditionary research</article-title><trans-title-group xml:lang="ru"><trans-title>Потоки метана на границе раздела вода–атмосфера на акватории Южно-Китайского моря по результатам экспедиционных исследований</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1768-8222</contrib-id><name-alternatives><name xml:lang="en"><surname>Legkodimov</surname><given-names>Alexey A.</given-names></name><name xml:lang="ru"><surname>Легкодимов</surname><given-names>Алексей Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher</p></bio><bio xml:lang="ru"><p>младший научный сотрудник</p></bio><email>legkodimov.aa@poi.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2806-3834</contrib-id><name-alternatives><name xml:lang="en"><surname>Mishukova</surname><given-names>Galina I.</given-names></name><name xml:lang="ru"><surname>Мишукова</surname><given-names>Галина Ивановна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Geography, Senior Researcher</p></bio><bio xml:lang="ru"><p>кандидат географических наук, старший научный сотрудник</p></bio><email>gmishukova@poi.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2995-9752</contrib-id><name-alternatives><name xml:lang="en"><surname>Le</surname><given-names>Duc Anh</given-names></name><name xml:lang="ru"><surname>Ле</surname><given-names>Дык Ань</given-names></name></name-alternatives><address><country country="VN">Viet Nam</country></address><bio xml:lang="en"><p>Candidate of Sciences in Computer</p></bio><bio xml:lang="ru"><p>кандидат компьютерных наук</p></bio><email>leducanh010282@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1916-3566</contrib-id><name-alternatives><name xml:lang="en"><surname>Bovsun</surname><given-names>Maria A.</given-names></name><name xml:lang="ru"><surname>Бовсун</surname><given-names>Мария Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher</p></bio><bio xml:lang="ru"><p>младший научный сотрудник</p></bio><email>bovsun.ma@poi.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zherdev</surname><given-names>Pavel D.</given-names></name><name xml:lang="ru"><surname>Жердев</surname><given-names>Павел Дмитриевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Senior Engineer</p></bio><bio xml:lang="ru"><p>старший инженер</p></bio><email>zherdev.pd@poi.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">V.I. Il’ichev Pacific Oceanological Institute, FEB RAS</institution></aff><aff><institution xml:lang="ru">Тихоокеанский океанологический институт им. В.И. Ильичёва ДВО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Vietnam Academy of Science and Technology</institution></aff><aff><institution xml:lang="ru">Институт морской геологии и геофизики Вьетнамской академии наук и технологий</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-04" publication-format="electronic"><day>04</day><month>09</month><year>2025</year></pub-date><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>29</fpage><lpage>42</lpage><history><date date-type="received" iso-8601-date="2025-08-10"><day>10</day><month>08</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-08-10"><day>10</day><month>08</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-7698/article/view/688926">https://journals.eco-vector.com/0869-7698/article/view/688926</self-uri><abstract xml:lang="en"><p>The article presents the results of studies of the spatiotemporal distribution of calculated methane flows at the water-atmosphere interface in the waters of the Vietnam continental shelf, slope and open part of the sea according to flight № 88 of the SRV Academician M.A. Lavrentiev (LV88) in the period from November 1 to November 29, 2019. As a result of the research, high variability was established from equilibrium and weak emission of 0–1 mole/(km²×day) to a very high intensity flux of 29 mole/(km²×day). The activity of gas exchange at the bottom–water–atmosphere boundary is due to the active release of CH4 from bottom sediments and is controlled by a complex of geological and hydrological factors.</p></abstract><trans-abstract xml:lang="ru"><p>В статье приведены результаты исследований пространственно-временного распределения рассчитанных потоков метана на границе раздела вода–атмосфера на акватории Привьетнамского континентального шельфа, склона и открытой части моря по данным рейса № 88 НИС «Академик М.А. Лаврентьев» (LV88) в период с 1 по 29 ноября 2019 г. В результате исследований установлена высокая изменчивость от равновесия и слабой эмиссии 0–1 моль/(км²×сут) до потока очень высокой интенсивности 29 моль/(км²×сут). Активность газообмена на границе дно–вода–атмосфера обусловлена активным выходом CH4 из донных отложений и контролируется комплексом геологических и гидрологических факторов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>methane</kwd><kwd>source</kwd><kwd>concentration</kwd><kwd>seawater</kwd><kwd>atmosphere</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>метан</kwd><kwd>источник</kwd><kwd>концентрация</kwd><kwd>морская вода</kwd><kwd>атмосфера</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>24-47-04001</award-id></award-group><funding-statement xml:lang="en">Russian Science Foundation No. 24-47-04001</funding-statement><funding-statement xml:lang="ru">Российский научный фонд № 24-47-04001</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Bange H.W., Bartell U.H., Rapsomanikis S., Andrae O. 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