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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">sergeogr</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Российской академии наук. Серия географическая</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2587-5566</issn><issn pub-type="epub">2658-6975</issn><publisher><publisher-name></publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31857/S2587556621040142</article-id><article-id custom-type="elpub" pub-id-type="custom">sergeogr-1410</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>Природные процессы и динамика геосистем</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Natural Processes and Dynamics of Geosystems</subject></subj-group></article-categories><title-group><article-title>Климатическая переходная зона севера России в летних условиях</article-title><trans-title-group xml:lang="en"><trans-title>Transitional Climate Zone of the Russian North in Summer Conditions</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>Титкова</surname><given-names>Т. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Titkova</surname><given-names>T. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">titkova@igras.ru</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>Золотокрылин</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Zolotokrylin</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">azolotokrylin1938@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт географии РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geography, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>08</day><month>11</month><year>2021</year></pub-date><volume>85</volume><issue>5</issue><fpage>714</fpage><lpage>725</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Титкова Т.Б., Золотокрылин А.Н., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Титкова Т.Б., Золотокрылин А.Н.</copyright-holder><copyright-holder xml:lang="en">Titkova T.B., Zolotokrylin A.N.</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://izvestia.igras.ru/jour/article/view/1410">https://izvestia.igras.ru/jour/article/view/1410</self-uri><abstract><p>Работа посвящена определению климатической переходной зоны севера России по комплексу климатических индикаторов и характеристик подстилающей поверхности и ее мониторингу в летний период на основе градиентного анализа. Рассматривается территория европейской части России и Западной Сибири севернее 56° с.ш., которая характеризуется циклонической активностью на Арктическом фронте в летний период. Переходная климатическая зона на севере России может выделяться одним или двумя индикаторами. В локальных геосистемах эти индикаторы могут меняться и дополнять друг друга. На данной территории выделяются два ключевых района, которые хорошо выражены по большинству параметров. Один из районов находится на северо-востоке европейской части России в районе Большеземельской и Ямальской тундры. Он обусловлен циклонической активностью на Арктическом фронте, выделяется областями максимальных градиентов температуры, коэффициента увлажнения, эвапотранспирации (Ev) и вегетационного индекса (NDVI) и приходится на ландшафты южной тундры, лесотундры и северной тайги (66°–67° с.ш.). Второй ключевой район расположен в среднетаежной зоне Западной Сибири и ограничен с севера Сибирскими Увалами. Здесь прослеживается область повышенной повторяемости циклонов (62°–63° с.ш.). Этот район также характеризуется повышенными горизонтальными контрастами температуры, коэффициента увлажнения, Ev и NDVI. Здесь зона максимальных градиентов Ev и NDVI протянулась сплошной полосой между Обью и Енисеем, усиливаясь на некоторых участках. Значимый тренд локализации климатической переходной зоны по ее индикаторам отсутствует. В зависимости от климатических условий значения максимальных градиентов параметров могут усиливаться или ослабевать.</p></abstract><trans-abstract xml:lang="en"><p>This paper is concerned with the definition of the transitional climate zone of the Russian North through a complex of climate indicators and characteristics of the underlying surface, and its monitoring in the summer period based on the gradient analysis. The European part of Russia and Western Siberia north of 56° N are explored. These regions were determined by a cyclonic activity in Arctic front and notable cyclone repeatability in the summer period. The transitional climate zone in the Russian North can be identified by one or two indicators. On adjacent areas, these indicators can alternate and complement each other. Two key regions are distinguished on this territory. They are well defined by most of the parameters. One of these regions is situated in the northeast of the European part of Russia (Bolshezemelskaya and Yamalskaya tundras); it is determined by the cyclonic activity in Arctic front. It differentiates by areas with maximal gradients of temperature, humidity ratio, evapotranspiration (Ev), and NDVI, which are situated in 66°–67° N (landscapes of southern tundra, forest tundra, and border of northern taiga). The second key region is in the middle taiga zone of Western Siberia (62°–63° N), where the increased cyclone repeatability influences it, and it is characterized by horizontal contrasts of temperature, humidity ratio, NDVI and Ev. Here a zone of maximal gradients of Ev, and NDVI stretches between Ob and Yenisei rivers, strengthening in some areas. There is no significant trend of localization of the transitional climate zone on its indicators. According to climate conditions, maximal gradients of parameters can strengthen or weaken.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>переходная климатическая зона</kwd><kwd>градиенты</kwd><kwd>температура</kwd><kwd>осадки</kwd><kwd>эвапотранспирация</kwd><kwd>NDVI</kwd><kwd>Арктический фронт</kwd><kwd>циклоническая активность</kwd><kwd>север России</kwd></kwd-group><kwd-group xml:lang="en"><kwd>transitional climatic zone</kwd><kwd>gradients</kwd><kwd>temperature</kwd><kwd>precipitation</kwd><kwd>evapotranspiration</kwd><kwd>NDVI</kwd><kwd>Arctic front</kwd><kwd>cyclonic activity</kwd><kwd>Northern Russia</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в Институте географии РАН по теме госзадания № 0148-2019-0009 “Изменения климата и их последствия для окружающей среды и жизнедеятельности населения на территории России”.</funding-statement><funding-statement xml:lang="en">The research was carried out at the Institute of Geography of the Russian Academy of Sciences within the framework of the state-ordered research theme no. 0148-2019-0009.</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">Бардин М.Ю., Платова Т.В., Самохина О.Ф. 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