Kouraev A.V. Elena A Zakharova et al. (2019) Ice Cover and Associated Water Structure in Lakes Baikal and Hovsgol from Satellite Observations and Field Studies. In: Barale V., Gade M. (eds) Remote Sensing of the Asian Seas. Springer, Cham.

Авторы: Kouraev A.V. Elena A Zakharova, Frédérique Rémy, Andrey G Kostianoy, Michail N Shimaraev, Nicholas MJ Hall, Andrey Ya Suknev

 https://doi.org/10.1007/978-3-319-94067-0_30

    Lakes Baikal (Russia) and Hovsgol (Mongolia) are covered every year by ice for several months. The distribution and state of the ice cover and snow on the ice affect the hydrophysical structure, spring bloom of diatoms and primary productivity, as well as transport on ice. In this respect combination of satellite remote sensing data with dedicated field measurements provide a unique tool for investigating ice cover state and development. Comparison of ENVISAT and SARAL radar altimetry missions data for Lake Baikal shows that SARAL’s AltiKa instrument can be successfully used for ice discrimination. We observe large decrease of radar return echo in late spring for both ENVISAT and SARAL and discuss it in the context of ice metamorphism. We then address an interesting natural phenomenon—giant ice rings on lakes Baikal and Hovsgol. Using satellite imagery and photography for 1974–2015 we have identified 45 rings on Lake Baikal (compared to 13 previously known) and also for the first time 4 rings on Lake Hovsgol. The results of our hydrographic surveys beneath the ice rings show the presence of warm double-convex lens-like eddies before and during manifestation of ice rings. These eddies are the driving factor for the formation of ice rings in these lakes. We reassess the existing hypotheses of ice ring formation and discuss the potential mechanisms of eddy formation.

this research is supported by the ERA.NET RUS Plus S&T #226 “ERALECC”, CNES TOSCA “Lakes” and “LakeIce”, CNRS PICS “BaLaLaICA”, RFBR 13-05-91051, IDEX Transversalité 2013 InHERA and by GDRI “CAR-WET-SIB”* projects

* совместное Русско-Французское финансирование.

Дата публикации: 2020

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