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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">10.59887/2073-6673.2024.17(4)-2</article-id><article-id custom-type="elpub" pub-id-type="custom">hydrophysics-1379</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>Модельные оценки межгодовой изменчивости характеристик экосистемы Ладожского озера в период с 1980 по 2020 годы</article-title><trans-title-group xml:lang="en"><trans-title>Model estimates of interannual variability of the Lake Ladoga ecosystem characteristics in the period from 1980 to 2020</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2005-4949</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Исаев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Isaev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Исаев Алексей Владимирович, старший научный сотрудник, кандидат географических наук</p><p>WoS ResearcherID: C-1370–2014, Scopus AuthorID: 25641182000</p><p>г. Москва, Нахимовский проспект, д. 36</p></bio><bio xml:lang="en"><p>36 Nakhimovsky Prosp., Moscow 117997</p></bio><email xlink:type="simple">isaev1975@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3909-537X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рябченко</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryabchenko</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рябченко Владимир Алексеевич, главный научный сотрудник, доктор физико-математических наук</p><p>WoS ResearcherID: R-3877-2016, Scopus AuthorID: 7005479766</p><p>г. Москва, Нахимовский проспект, д. 36</p></bio><bio xml:lang="en"><p>36 Nakhimovsky Prosp., Moscow 117997</p></bio><email xlink:type="simple">vlaryabchenko@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт Океанологии им. П.П. Ширшова РАН<country>Россия</country></aff><aff xml:lang="en">Shirshov Institute of Oceanology, Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>09</day><month>01</month><year>2025</year></pub-date><volume>17</volume><issue>4</issue><fpage>32</fpage><lpage>42</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Исаев А.В., Рябченко В.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Исаев А.В., Рябченко В.А.</copyright-holder><copyright-holder xml:lang="en">Isaev A.V., Ryabchenko V.A.</copyright-holder><license 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/1379">https://hydrophysics.spbrc.ru/jour/article/view/1379</self-uri><abstract><p>Многочисленные обобщения, основанные на натурных исследованиях, показывают, что пространственно-временное покрытие Ладожского озера данными наблюдений недостаточно для надёжной количественной оценки межгодовой изменчивости характеристик и биогеохимических потоков в экосистеме озера. В настоящей работе представлены оценки межгодовой динамики основных характеристик экосистемы и биогеохимических потоков в озере в период с 1980 по 2020 гг., полученные с помощью верифицированной трёхмерной эко-гидродинамической модели Ладожского озера. Выявлены особенности реакции экосистемы озера на снижение внешней фосфорной нагрузки на 39 % в течение исследуемого периода, которое сопровождается снижением биомассы и первичной продукции фитопланктона только на 30 %. Основным механизмом, объясняющим указанную реакцию экосистемы водоема, является увеличение скорости рециклинга за счет увеличения температуры воды в фотическом слое в вегетативный период, обусловленного изменением климата. Оценено время оборота фосфора в озере, которое составило примерно 5,4 года для рассматриваемого периода времени 1980–2020 гг.</p></abstract><trans-abstract xml:lang="en"><p>Numerous generalizations based on field studies show that the spatiotemporal coverage of Lake Ladoga with observational data is insufficient for a reliable quantitative assessment of the interannual variability of the characteristics and biogeochemical fluxes in the lake ecosystem. This paper presents estimates of the interannual dynamics of the main ecosystem characteristics and biogeochemical fluxes in the lake for the period from 1980 to 2020, obtained using a verified three-dimensional eco-hydrodynamic model of Lake Ladoga. The features of the lake ecosystem response to a 39 % decrease in the external phosphorus load during the study period, which is accompanied by a decrease in phytoplankton biomass and primary production by only 30 %, are revealed. The main mechanism explaining this response of the reservoir ecosystem is an increase in the recycling rate due to an increase in water temperature in the photic layer during the growing season, caused by climate change. The phosphorus turnover time in the lake was estimated to be approximately 5.4 years for the considered period of 1980–2020.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>межгодовая изменчивость</kwd><kwd>экосистема</kwd><kwd>биогеохимические потоки</kwd><kwd>математическое моделирование</kwd><kwd>Ладожское озеро</kwd></kwd-group><kwd-group xml:lang="en"><kwd>interannual variability</kwd><kwd>ecosystem</kwd><kwd>biogeochemical fluxes</kwd><kwd>mathematical modeling</kwd><kwd>Lake Ladoga</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Исследование выполнено при поддержке грантов Российского научного фонда (проект № 23-17-20010) и Санкт-Петербургского научного фонда (проект № 23-17-20010).</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The research was supported by grants from the Russian Science Foundation (Project No. 23-17-20010) and the St. Petersburg Science Foundation (Project No. 23-17-20010).</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">Ладога / Под ред. 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