hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Sciences10.59887/fpg/umx3-6tet-vhkrhydrophysics-1158Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESЧисленное моделирование временной изменчивости эмиссии метана из Можайского водохранилищаNumerical Simulation of Temporal Variability of Methane Emissions from Mozhaysk ReservoirСтепаненкоВ. М.StepanenkoV. M.

СТЕПАНЕНКО Виктор Михайлович

РИНЦ AuthorID: 128281

Scopus AuthorID: 12808698000

119991, ул. Ленинские горы, д. 1, г. Москва

119991, Leninskie Gory, 1, Moscow

Moscow

stepanen@srcc.msu.ruЛомовВ. А.LomovV. A.

ЛОМОВ Виктор Александрович

РИНЦ AuthorID: 1067937

Scopus AuthorID: 57211208174

119991, ул. Ленинские горы, д. 1, г. Москва

119017, Пыжевский пер. 3, стр. 1, г. Москва

119991, Leninskie Gory, 1, Moscow

119017, Pyzhevsky per., 3/1, Moscow

lomson620@mail.ruГречушниковаМ. Г.GrechushnikovaM. G.

ГРЕЧУШНИКОВА Мария Георгиевна

РИНЦ AuthorID: 68381

Scopus AuthorID: 6507726807

119991, ул. Ленинские горы, д. 1, г. Москва

119333, ул. Губкина, д. 3, г. Москва

119991, Leninskie Gory, 1, Moscow

119333, Gubkina st., 3, Moscow

Московский государственный университет имени М.В. Ломоносова; Московский центр фундаментальной и прикладной математикиРоссияLomonosov Moscow State University; Moscow Center for Fundamental and Applied MathematicsRussian FederationМосковский государственный университет имени М.В. Ломоносова; Институт физики атмосферы им. А.М. ОбуховаРоссияLomonosov Moscow State University; A.M. Obukhov Institute of Atmosphere Physics, Russian Academy of SciencesRussian FederationМосковский государственный университет имени М.В. Ломоносова; Институт водных проблем, Российская академия наукРоссияLomonosov Moscow State University; Institute of Water Problems, Russian Academy of SciencesRussian Federation20220801202315482–100Copyright © Степаненко В.М., Ломов В.А., Гречушникова М.Г., 20232023Степаненко В.М., Ломов В.А., Гречушникова М.Г.Stepanenko V.M., Lomov V.A., Grechushnikova M.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/1158

Получены оценки эмиссии метана с поверхности Можайского водохранилища за период с 2015 по 2019 гг. с помощью математической модели LAKE2.3. Среднее значение эмиссии составляет 361 тС в год, средний удельный поток — 37,7 мгС–СН4 м–2 день–1, что удовлетворительно согласуется с данными наблюдений. Наибольший вклад в общую эмиссию СН4 вносит пузырьковая составляющая. В течение периода нагревания наблюдается постепенное увеличение эмиссии метана с максимумом перед началом осеннего перемешивания. В ходе численных экспериментов с моделью установлено, что высокочастотная изменчивость потоков метана в атмосферу связана с колебаниями атмосферного давления и резкими изменениями уровня воды при том, что наиболее значимые выбросы связаны с последним фактором. Эффективным способом для калибровки диффузной составляющей потока метана в атмосферу является потенциальная наибольшая скорость окисления метана в реакции Михаэлис-Ментен, а для пузырькового потока — параметр температурной зависимости генерации метана в донных отложениях q10. Исследование чувствительности эмиссии метана к указанным параметрам проведено на основе численной модели LAKE2.3.

Estimates of methane emission from the Mozhaysk reservoir surface were carried out using the mathematical model LAKE2.3. The average emission value is 361 tC per year, the average flux = 37.7 mgC–CH4 m–2 day–1. Comparison of the obtained estimates with in situ measurements revealed, that the methane emission and specific flux according to the model are in good agreement with the observations data. The ebullition makes the largest contribution to the total emission. During the heating period, an increase of methane emission is observed with a maximum before the autumn mixing stage. In the course of numerical experiments with the model, it was found that the amplitude of methane fluxes into the atmosphere is associated with fluctuations in atmospheric pressure, and the most significant emissions peaks associated with water level drawdowns. Effective method for calibrating the diffusion component of the methane flux into the atmosphere is the potential rate of methane oxidation in the Michaelis-Menten reaction, and for ebullition it is the methane generation parameter in bottom sediments — q10. For the described numerical experiments, the article presents the values of the annual emissions of methane into the atmosphere. 

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The authors declare that there are no conflicts of interest present.