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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-459</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>Статьи</subject></subj-group></article-categories><title-group><article-title>МЕТОДИКА ОБРАЩЕНИЯ СПЕКТРОВ ПРОЗРАЧНОСТИ ДЛЯ ОЦЕНКИ СОДЕРЖАНИЯ ФРЕОНА CCl3F В АТМОСФЕРЕ</article-title><trans-title-group xml:lang="en"><trans-title>TECHNIQUE OF INVERSION OF THE TRANSPARENCY SPECTRA FOR EVALUATING THE CONTENT OF CCl3F FREON IN THE ATMOSPHERE</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>Поляков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Polyakov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg, 199034</p></bio><email xlink:type="simple">a.v.polyakov@spbu.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>Поберовский</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Poberovsky</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Виролайнен</surname><given-names>Я. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Virolainen</surname><given-names>Ya. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макарова</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarova</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет</institution></aff><aff xml:lang="en"><institution>St. Petersburg State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>13</day><month>03</month><year>2020</year></pub-date><volume>87</volume><issue>1</issue><fpage>108</fpage><lpage>115</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Поляков А.В., Поберовский А.В., Виролайнен Я.А., Макарова М.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Поляков А.В., Поберовский А.В., Виролайнен Я.А., Макарова М.В.</copyright-holder><copyright-holder xml:lang="en">Polyakov A.V., Poberovsky A.V., Virolainen Y.A., Makarova M.V.</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://zhps.ejournal.by/jour/article/view/459">https://zhps.ejournal.by/jour/article/view/459</self-uri><abstract><p>Выполнен подбор оптимальных параметров и разработана методика решения обратной задачи определения общего содержания (ОС) фреона R-11 (CCl3F) по наземным спектрометрическим измерениям солнечного излучения на станции NDACC St. Petersburg с использованием Фурье-интерферометра IFS125HR и программного обеспечения SFIT4. Основные особенности методики: интервал спектра 830—860 см–1, предварительно измерена функция спектральной чувствительности прибора, учитываются континуальное поглощение излучения водяным паром и ослабление излучения пленкой аморфного льда, осаждающейся на приемнике. При решении обратной задачи для компенсации изменчивости толщины пленки льда форма базовой линии спектра корректируется полиномом второй степени, уточняется вертикальное распределение водяного пара. С помощью методики определено ОС R-11 в период 2009—2019 гг., получены оценки погрешностей измерений: средняя систематическая погрешность 7.4 % и случайная 2.9 % за весь период наблюдений. Оценка долговременного тренда ОС составляет –0.29 ± 0.07 %/год, средней объемной концентрации –0.31 ± 0.07 %/год.</p></abstract><trans-abstract xml:lang="en"><p>We developed a technique and selected the optimal parameters for solving the inverse problem of determining the total content of R-11 freon (CCl3F) from ground-based spectrometric measurements of solar radiation at the NDACC St. Petersburg station using a IFS125HR Fourier interferometer and SFIT4 software. The main features of the technique: the used spectral interval is 830-860 cm-1, the previously measured spectral sensitivity function of the device is taken into account, and the continuum absorption of radiation by water vapor and attenuation of radiation by amorphous ice deposited on the receiver are also taken into account. Moreover, when solving the inverse problem to compensate the variability of the thickness of the ice film, the shape of the baseline of the spectrum is corrected by a polynomial of the second degree and the vertical distribution of water vapor is specified. Using the technique, the total content of R-11 was determined in the period 2009-2019, and an estimation of measurement errors was obtained: the average systematic error was 7.4% and the random error was 2.9% for the entire observation period. The assessment of the long-term total content trend is -0.29 ± 0.07%/year, and the mean molar fraction trend is -0.31 ± 0.07%/year.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>трихлорфторметан</kwd><kwd>содержание фреонов в атмосфере</kwd><kwd>наземный метод прозрачности</kwd></kwd-group><kwd-group xml:lang="en"><kwd>trichlorofluoromethane</kwd><kwd>atmospheric freon content</kwd><kwd>ground-based transparency method</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке гранта Российского фонда фундаментальных исследований 18-05-00426 а.</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">M. J. Molina, F. S. Rowland. Nature, 249 (1974) 810—812</mixed-citation><mixed-citation xml:lang="en">M. J. Molina, F. S. Rowland. 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