Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 54912 10.2205/2022ES01SI11 СПЕЦВЫПУСК: "ФУНДАМЕНТАЛЬНЫЕ И ПРИКЛАДНЫЕ АСПЕКТЫ ГЕОЛОГИИ, ГЕОФИЗИКИ И ГЕОЭКОЛОГИИ" Special Issue: "Fundamental and applied aspects of geology, geophysics and geoecology" СПЕЦВЫПУСК: "ФУНДАМЕНТАЛЬНЫЕ И ПРИКЛАДНЫЕ АСПЕКТЫ ГЕОЛОГИИ, ГЕОФИЗИКИ И ГЕОЭКОЛОГИИ" Atmospheric turbulence structure above urban nonhomogeneous surface Atmospheric turbulence structure above urban nonhomogeneous surface Дрозд Илья Дмитриевич Drozd I. D. Репина Ирина Анатольевна Repina I. A. Гавриков Александр Владимирович Gavrikov A. V. Степаненко Виктор Михайлович Stepanenko V. M. Артамонов Арсений Юрьевич Artamonov A. Yu. Пашкин Артем Денисович Pashkin A. D. Варенцов Александр Иванович Varentsov A. I. Московский государственный университет им. М. В. Ломоносова Москва Россия Lomonosov Moscow State Univerisity Moscow Russian Federation Институт физики атмосферы им. А.М. Обухова РАН Россия Institute of Atmospheric Physics named after. A.M. Obukhov RAS Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology RAS Russian Federation Московский государственный университет им. М. В. Ломоносова Россия Lomonosov Moscow State Univerisity Russian Federation Институт физики атмосферы им. А. М. Обухова РАН Россия A. M. Obukhov Institute of Atmospheric Physics RAS Russian Federation Институт физики атмосферы им. А. М. Обухова РАН Россия A. M. Obukhov Institute of Atmospheric Physics RAS Russian Federation Московский государственный университет им. М. В. Ломоносова Россия Lomonosov Moscow State Univerisity Russian Federation 04 12 2022 04 12 2022 22 5 1 9 01 07 2022 10 08 2022 https://rjes.ru/en/nauka/article/54912/view

A new 21-meter eddy covariance tower is installed in the Meteorological observatory of Moscow State University in November 2019. It includes 3 levels with METEK sonic anemometers. The mast is located inside the urban area and makes it possible to analyze the structure of atmospheric turbulence in a heterogeneous urban condition. The measurement data from November 2019 to May 2020 are processed. Turbulent fluctuations of the wind velocity components are found to increase with height within 20 meters above the surface. The turbulent kinetic energy is proportional to the square of the averaged horizontal wind speed. The drag coefficient is determined by the type of footprint surface, with a value of 0.08 and 0.05 for urbanized and vegetated surfaces, respectively. The "turbulent flux of heat flux" is reasonably well predicted by diagnostic relation with heat flux, skewness and standard deviation of vertical speed, suggesting significant contribution of coherent structures to turbulent fluxes. The daily amplitude of the temperature variance increases with the daily amplitude of the average temperature. The paper considers the conditions for the applicability of the Monin-Obukhov similarity theory to the calculation of turbulent fluxes over a heterogeneous urban landscape.

A new 21-meter eddy covariance tower is installed in the Meteorological observatory of Moscow State University in November 2019. It includes 3 levels with METEK sonic anemometers. The mast is located inside the urban area and makes it possible to analyze the structure of atmospheric turbulence in a heterogeneous urban condition. The measurement data from November 2019 to May 2020 are processed. Turbulent fluctuations of the wind velocity components are found to increase with height within 20 meters above the surface. The turbulent kinetic energy is proportional to the square of the averaged horizontal wind speed. The drag coefficient is determined by the type of footprint surface, with a value of 0.08 and 0.05 for urbanized and vegetated surfaces, respectively. The "turbulent flux of heat flux" is reasonably well predicted by diagnostic relation with heat flux, skewness and standard deviation of vertical speed, suggesting significant contribution of coherent structures to turbulent fluxes. The daily amplitude of the temperature variance increases with the daily amplitude of the average temperature. The paper considers the conditions for the applicability of the Monin-Obukhov similarity theory to the calculation of turbulent fluxes over a heterogeneous urban landscape.

 atmospheric turbulence urban climate drag coefficient Monin-Obukhov similarity theory turbulent statistics footprint atmospheric turbulence urban climate drag coefficient Monin-Obukhov similarity theory turbulent statistics footprint The data of measurements by the automatic meteorological complex of the MSU MO were kindly provided by E.~Yu.~Zhdanova. The work was partially supported by the Ministry of Science and Higher Education of Russia Ministry of Science and Higher Education of Russia (Agreements 075-15-2021-574 and 075-15-2022-284). Statistical data processing was supported by the RSF grant 21-17-00249. The data of measurements by the automatic meteorological complex of the MSU MO were kindly provided by E.~Yu.~Zhdanova. The work was partially supported by the Ministry of Science and Higher Education of Russia Ministry of Science and Higher Education of Russia (Agreements 075-15-2021-574 and 075-15-2022-284). Statistical data processing was supported by the RSF grant 21-17-00249.

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