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The influence of deep convection on aeration of the bottom zone in Baikal

  • Research in the Baikal Watershed
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Abstract

We investigated the influence of deep forced temperature convection on aeration of the bottom water layer in the pelagic zone of Baikal. Temperature T (± 0.002°C) and oxygen O2 concentration (± 0.01 mg/L) were measured by using the SBE-25 probe with the SBE-43 oxygen sensor in May-July 2006−2007 and 2009−2013. Oxygen input into the bottom layer with cold intrusions was determined for 79 cases. The study revealed a quantitative correlation between the heat deficit and the rise in oxygen content in the bottom layer during cold intrusions. This correlation was used to reconstruct the values of intrusion aeration of the bottom layer during 1993−2005. It is ascertained that the intrusion-caused 2006−2013-average oxygen input into Baikal’s bottom layer is virtually close to the annual oxygen demand for oxidation processes in the water column and bottom sediments. In the southern and middle parts of Baikal, intrusion-caused input of oxygen corresponds to a higher rate of its demand (4.5−4.6x10-4 mg/L per day). A slight increase in oxygen concentration was detected in the bottom layer of the South and Middle Baikal and a slight decrease in the bottom layer of North Baikal during 1993−2013.

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Authors and Affiliations

  1. Limnological Institute, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

    M. N. Shimaraev, V. M. Domysheva, R. Yu. Gnatovskii, V. V. Blinov & M. V. Sakirko

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  1. M. N. Shimaraev
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  2. V. M. Domysheva
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  3. R. Yu. Gnatovskii
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  4. V. V. Blinov
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  5. M. V. Sakirko
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Correspondence to M. N. Shimaraev.

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Original Russian Text © M.N. Shimaraev, V.M. Domysheva, R.Yu. Gnatovskii, V.V. Blinov, M.V. Sakirko, 2016, published in Geografiya i Prirodnye Resursy, 2016, Vol. 37, No. 3, pp. 70–77.

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Shimaraev, M.N., Domysheva, V.M., Gnatovskii, R.Y. et al. The influence of deep convection on aeration of the bottom zone in Baikal. Geogr. Nat. Resour. 37, 212–219 (2016). https://doi.org/10.1134/S1875372816030045

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  • DOI: https://doi.org/10.1134/S1875372816030045

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