Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 48383 10.2205/2021ES000763 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Mesoscale vortex over Lake Baikal: A case-study Mesoscale vortex over Lake Baikal: A case-study Шестакова А. А. Shestakova A. A. Репина И. А. Repina I. A. Институт физики атмосферы имени А. М. Обухова РАН Москва Россия A. M. Obukhov Institute of Atmospheric Physics RAS Moscow Russian Federation Институт физики атмосферы имени А. М. Обухова РАН Москва Россия A. M. Obukhov Institute of Atmospheric Physics RAS Москва Russian Federation 26 01 2022 26 01 2022 21 5 1 19 21 01 2022 01 04 2021 https://rjes.ru/en/nauka/article/48383/view

This paper presents the results of a case-study of lake-effect circulation over Lake Baikal in December 2012, when the lake surface was still almost free from ice. The most spectacular manifestation of lake effect was a mesoscale vortex over the northern part of the lake. The analysis of this phenomenon is based on satellite observations, in-situ measurements, as well as on mesoscale numerical modeling with the WRF-ARW model. The model reproduced well the time and location of the vortex observed, correctly featuring cloud structures and time course of meteorological parameters near the surface, though it was less accurate reproducing precipitation due to some space shift between observed and simulated landfall location. Sensitivity experiments revealed the role of the warm lake surface and orography in the vortex generation and intensification. Unlike vortices over the American Great Lakes, where orography is small and the main reasons of vortex formation are breeze circulation and diabatic heat fluxes from the surface, considered Baikal vortex was formed primarily due to orography-induced convergence. Orography generated conducive conditions for local winds and breeze circulation and to a large extent formed unstable temperature stratification due to partial blocking of the incoming flow.

This paper presents the results of a case-study of lake-effect circulation over Lake Baikal in December 2012, when the lake surface was still almost free from ice. The most spectacular manifestation of lake effect was a mesoscale vortex over the northern part of the lake. The analysis of this phenomenon is based on satellite observations, in-situ measurements, as well as on mesoscale numerical modeling with the WRF-ARW model. The model reproduced well the time and location of the vortex observed, correctly featuring cloud structures and time course of meteorological parameters near the surface, though it was less accurate reproducing precipitation due to some space shift between observed and simulated landfall location. Sensitivity experiments revealed the role of the warm lake surface and orography in the vortex generation and intensification. Unlike vortices over the American Great Lakes, where orography is small and the main reasons of vortex formation are breeze circulation and diabatic heat fluxes from the surface, considered Baikal vortex was formed primarily due to orography-induced convergence. Orography generated conducive conditions for local winds and breeze circulation and to a large extent formed unstable temperature stratification due to partial blocking of the incoming flow.

 Mesoscale vortex lake-effect precipitation WRF-ARW vorticity Mesoscale vortex lake-effect precipitation WRF-ARW vorticity The work is funded by Russian Foundation for Basic Research, grant # 19-55-44028 The work is funded by Russian Foundation for Basic Research, grant # 19-55-44028

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