Mesoscale vortex over Lake Baikal: A case-studyстатья
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
Аннотация:This paper presents the results of a case-study of lake-effect circulation over Lake Baikal inDecember 2012, when the lake surface was still almost free from ice. The most spectacularmanifestation of lake effect was a mesoscale vortex over the northern part of the lake. Theanalysis of this phenomenon is based on satellite observations, in-situ measurements, as wellas on mesoscale numerical modeling with the WRF-ARW model. The model reproduced wellthe time and location of the vortex observed, correctly featuring cloud structures and timecourse of meteorological parameters near the surface, though it was less accurate reproducingprecipitation 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 vortexgeneration and intensification. Unlike vortices over the American Great Lakes, where orographyis small and the main reasons of vortex formation are breeze circulation and diabatic heat fluxesfrom the surface, considered Baikal vortex was formed primarily due to orography-inducedconvergence. Orography generated conducive conditions for local winds and breeze circulationand to a large extent formed unstable temperature stratification due to partial blocking of theincoming flow.