A one-dimensional model of vertical stratification of Lake Shira focussed on winter conditions and ice cover

Описание

Тип публикации: статья из журнала

Год издания: 2010

Идентификатор DOI: 10.1007/s10452-010-9327-7

Ключевые слова: Convective mixed layer, Ice formation, Ice melting, Simplified model, Winter profiles, Convective mixed layer, Ice formation, Ice melting, Simplified model, Winter profiles, anoxic conditions, hydrogen sulfide, ice cover, inhomogeneity, meromictic lake, numerical model, one-dimensional modeling, pycnocline, salinity, seasonality, stratification, vertical profile, water column, water temperature, Khakassia, Lake Shira, Russian Federation

Аннотация: In meromictic lakes such as Lake Shira, horizontal inhomogeneity is small in comparison with vertical gradients. To determine the vertical distribution of temperature, salinity, and density of water in a deep zone of a Lake Shira, or other saline lakes, a one-dimensional (in vertical direction) mathematical model is presented. A spПоказать полностьюecial feature of this model is that it takes into account the process of ice formation. The model of ice formation is based on the one-phase Stefan problem with the linear temperature distribution in the solid phase. A convective mixed layer is formed under an ice cover due to salt extraction in the ice formation process. To obtain analytical solutions for the vertical distribution of temperature, salinity, and density of water, we use a scheme of vertical structure in the form of several layers. In spring, the ice melts as top and bottom. These processes are taken into account in the model. The calculated profiles of salinity and temperature of Shira Lake are in good agreement with field measurement data for each season. Additionally, we focussed on the redox zone, which is the zone in which the aerobic layers of a water column meet the anaerobic ones. Hyperactivity of plankton communities is observed in this zone in lakes with hydrogen sulphide monimolimnion, and Lake Shira is among them. The location of the redox zone in the lake, which is estimated from field measurements, coincides with a sharp increase in density (the pycnocline) during autumn and winter. During spring and summer, the redox zone is deeper than the pycnocline. The location of pycnocline calculated with the hydro physical model is in good agreement with field measurement data.

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Издание

Журнал: AQUATIC ECOLOGY

Выпуск журнала: Vol. 44, Is. 3

Номера страниц: 571-584

ISSN журнала: 13862588

Место издания: DORDRECHT

Издатель: SPRINGER

Авторы

  • Genova S.N. (Inst Computat Modeling SB RAS, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Math, Krasnoyarsk 660041, Russia)
  • Belolipetskii V.M. (Inst Computat Modeling SB RAS, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Math, Krasnoyarsk 660041, Russia)
  • Rogozin D.Y. (Inst Biophys SB RAS, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Math, Krasnoyarsk 660041, Russia)
  • Degermendzhy A.G. (Inst Biophys SB RAS, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Math, Krasnoyarsk 660041, Russia)
  • Mooij W.M. (Netherlands Inst Ecol, Ctr Limnol, NL-3631 AC Nieuwersluis, Netherlands)

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