Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 51133 10.12737/stp-84202210 Results of current research Results of current research Results of current research Comparing methods to estimate cloud cover over the Baikal Natural Territory in December 2020 Comparing methods to estimate cloud cover over the Baikal Natural Territory in December 2020 Подлесный Степан Витальевич Podlesny Stepan Vitalyevich step8907@mail.ru Девятова Елена Викторовна Devyatova Elena Viktorovna devyatova@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Саункин Андрей Витальевич Saunkin Andrey Vitalyevich saunkin@inbox.ru https://orcid.org/0000-0001-8758-7964 Васильев Роман Валерьевич Vasilyev Roman Valeryevich roman_vasilyev@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Институт солнечно-земной физики СО РАН Иркутск Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 24 12 2022 24 12 2022 8 4 95 102 21 06 2022 15 09 2022 https://zh-szf.ru/en/nauka/article/51133/view

The paper addresses the issue of how much cloud cover data obtained using satellite and model-interpolation techniques are suitable for monitoring the transparency of the atmosphere and determining conditions for airglow observations at a local geophysical observatory. For this purpose, we compared the temporal dynamics of cloud cover from ECMWF’s ERA5 reanalysis and NOAA satellites with the night atmosphere transparency according to a digital camera. We considered the dynamics of the addressed parameters at the Geophysical Observatory of the Institute of Solar-Terrestrial Physics, located in the Baikal Natural Territory near the village of Tory (Republic of Buryatia, Russia), during December 2020. The comparative analysis showed a generally good agreement between cloud cover data from ECMWF’s ERA5 climate reanalysis and those observed with the camera. Disadvantages are the lack of information on rapid variations in cloud cover in the reanalysis and positive and negative delays in the dynamics of cloud fields that last about two hours. Due to irregular satellite data, large time gaps between passes and difficulties in estimating cloud cover at night, we could not come to reliable conclusions concerning the applicability of satellite data.

The paper addresses the issue of how much cloud cover data obtained using satellite and model-interpolation techniques are suitable for monitoring the transparency of the atmosphere and determining conditions for airglow observations at a local geophysical observatory. For this purpose, we compared the temporal dynamics of cloud cover from ECMWF’s ERA5 reanalysis and NOAA satellites with the night atmosphere transparency according to a digital camera. We considered the dynamics of the addressed parameters at the Geophysical Observatory of the Institute of Solar-Terrestrial Physics, located in the Baikal Natural Territory near the village of Tory (Republic of Buryatia, Russia), during December 2020. The comparative analysis showed a generally good agreement between cloud cover data from ECMWF’s ERA5 climate reanalysis and those observed with the camera. Disadvantages are the lack of information on rapid variations in cloud cover in the reanalysis and positive and negative delays in the dynamics of cloud fields that last about two hours. Due to irregular satellite data, large time gaps between passes and difficulties in estimating cloud cover at night, we could not come to reliable conclusions concerning the applicability of satellite data.

 cloud cover atmospheric transparency ECMWF’s ERA5 reanalysis satellite observations cloud cover atmospheric transparency ECMWF’s ERA5 reanalysis satellite observations The work was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant No. 075-15-2020-787) for implementation of Major scientific projects on priority areas of scientific and technological development (the project «Fundamentals, methods, and technologies for digital monitoring and forecasting of the environmental situation on the Baikal natural territory») The work was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant No. 075-15-2020-787) for implementation of Major scientific projects on priority areas of scientific and technological development (the project «Fundamentals, methods, and technologies for digital monitoring and forecasting of the environmental situation on the Baikal natural territory»)

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