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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/S2073667321020076</article-id><article-id custom-type="elpub" pub-id-type="custom">hydrophysics-80</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>Особенности климатических соотношений температуры поверхности воды и приводного слоя воздуха в период весеннего прогрева Ладожского озера</article-title><trans-title-group xml:lang="en"><trans-title>Features of Climatic Relationships between Surface Water-Air Temperature during Vernal Heating Period in Lake Ladoga</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>Науменко</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Naumenko</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196105, Севастьянова, д. 9, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196105, Sevastyanova Str., 9, St. Petersburg</p></bio><email xlink:type="simple">m.a.naumenko@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт Озероведения РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Limnology of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>30</day><month>11</month><year>2021</year></pub-date><volume>14</volume><issue>2</issue><fpage>78</fpage><lpage>88</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Науменко М.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Науменко М.А.</copyright-holder><copyright-holder xml:lang="en">Naumenko M.A.</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/80">https://hydrophysics.spbrc.ru/jour/article/view/80</self-uri><abstract><p>На основе временных пространственных распределений температуры поверхности воды Ладожского озера и температуры приводного воздуха в период существования весенней фронтальной зоны (термобара) установлены климатические количественные соотношения между температурами воды, воздуха, площадями стратифицированной (Tпов &gt; 4 °C) и изотермической области (Tпов &lt; 4 °C) в Ладожском озере. Эти эмпирические регрессионные модели указывают на устойчивое соотношение между выбранными параметрами и позволяют использовать их при анализе климатических вариаций. Определены климатические величины (нормы) температуры поверхности воды и приводного воздуха и даты их возникновения в период существования весенней термической зоны на Ладожского озера, относительно которых следует оценивать отклонения.Минимальная температура поверхности воды в глубоководной части Ладожского озера в период возникновения термической фронтальной зоны является своеобразным индикатором («памятью») зимнего состояния озера и значением, с которого начинается прогрев после таянья льда и которое во многом определяет дату исчезновения фронта. Аппроксимация временного хода минимальной температуры поверхности воды в глубоководной зоне озера позволяет оценить дату возникновения первоначальной стратификации всего Ладожского озера. Межгодовые вариации даты исчезновения на поверхности воды 4 °C изотермы изменяются от одной до четырех недель, это связано с различиями год от года минимальной температуры поверхности озера в глубоководной части озера, определяемой зимними условиями, ветровой ситуацией, облачностью и, следовательно, интенсивностью прихода тепла в Ладожское озеро. Скорость увеличения температуры поверхности воды стратифицированной зоны значительно больше скорости нагревания изотермической области.</p></abstract><trans-abstract xml:lang="en"><p>Сlimatic quantitative relationships are established between the surface water and air temperatures, the areas of the stratified (Twsur &gt; 4 °C) and the isothermal area (Twsur &lt; 4 °C) in Lake Ladoga during vernal frontal zone (thermobar) period. Initial data were based on the temporal spatial distributions of the temperature of the water surface of Lake Ladoga and the upper air temperature. These empirical regression models indicate a stable relationship between the selected parameters and allow their use in the analysis of climatic variations. The climatic values (norms) of the surface water and air temperature and the dates of their occurrence during the existence of the spring thermal zone on Lake Ladoga are determined, relative to which deviations should be estimated.The spring minimum temperature of the water surface in the deepwater part of Lake Ladoga during the appearance of the thermal frontal zone is a kind of indicator (“memory”) of the winter state of the lake and the value from which heating begins after ice melting and which largely determines the date of disappearance of the front. The approximation of the temporal course of the surface water temperature’s minimum in the deep-water zone of the lake allows us to estimate the time of onset of full thermal stratification in Lake Ladoga. Interannual variations in the date of disappearance of the isotherm on the water surface of 4 °C changes from one to four weeks in relation to norm, this is due to differences from year to year of the minimum surface temperature of the lake in the deepest part of the lake, determined by winter conditions, wind conditions, cloud cover and, therefore, the intensity of lake-atmosphere heat exchange in Lake Ladoga. The rate of increase in the water surface temperature of the stratified zone is much greater than the rate of heating of the isothermal region.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>весенняя фронтальная зона</kwd><kwd>температура воды и воздуха</kwd><kwd>климатические соотношения</kwd><kwd>Ладожское озеро</kwd></kwd-group><kwd-group xml:lang="en"><kwd>vernal frontal zone</kwd><kwd>water and air temperature</kwd><kwd>climatic relations</kwd><kwd>Lake Ladoga</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Проведенные исследования выполнены по госзаданию № 0154–2019–0001 «Комплексная оценка динамики экосистем Ладожского озера и водоемов его бассейна под воздействием природных и антропогенных факторов».</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">Филатов Н.Н. 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