Journal of Oceanology and Limnology

, Volume 36, Issue 6, pp 2018–2032 | Cite as

A model study of the effect of weather forcing on the ecology of a meromictic Siberian lake

  • Igor G. Prokopkin
  • Egor S. ZadereevEmail author
Special Issue on Salt Lakes: From the 13th International Conference on Salt Lake Research Ulan-Ude, 20–25 August 2017 Guest editors: Aharon OREN, DENG Tianlong, Nikolai V. SHADRIN, ZHENG Mianping, Egor S. ZADEREEV


We used a Lake Shira numerical model to estimate the response of the ecosystem of a saline meromictic lake to variations in weather parameters during the growing season. The sensitivity analysis of the model suggests that compared to other external (nutrient inflows) and internal (spring biomasses of food-web components) factors, weather parameters are among the most influential for both mixolimnetic (phyto- and zooplankton) and monimolimnetic (purple sulfur bacteria, sulfur reducing bacteria and hydrogen sulfide) food-web components. Calculations with different weather scenarios shows how changes in the water temperature and mixing depth affect mixolimnetic and monimolimnetic food-web components and the depth of the oxic-anoxic interface in a meromictic lake. When weather forcing stimulates an increase in the biomass of food-web components in the mixolimnion, it produces cascading effects that lead to three results: 1) a higher content of detritus in the water column; 2) a higher content of hydrogen sulfide in the monimolimnion; 3) raising of the oxic-anoxic interface closer to the water-air surface. This cascading effect is complicated by the negative correlation between two light dependent primary producers located at different depths—phytoplankton in the mixolimnion and purple sulfur bacteria at the oxic-anoxic interface. Thus, weather conditions that stimulate higher phytoplankton biomass are associated with a higher detritus content and lower biomass of purple sulfur bacteria, a higher content of hydrogen sulfide and a shallower oxic-anoxic interface. The same weather conditions (higher wind, lower cloud cover, and lower air temperature) promote a scenario of less stable thermal stratification. Thus, our calculations suggest that weather parameters during the summer season strongly control the mixing depth, water temperature and the mixolimnetic food web. An effect of biogeochemical and physical interactions on the depth of the oxicanoxic interface is also detectable. However, intra- and interannual climate and weather effects will be more important for the control of meromixis stability.


meromictic lake numerical model weather forcing sensitivity analysis stratification food web 


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We are grateful to all colleagues from the Institute of Biophysics SB RAS and other academic institutes who have been engaged in long-term research at Lake Shira, providing the field data to support modeling. Special thanks to Prof. Aharon Oren, Elena Krasova and Sofia Shishatskaya for linguistic improvements. Two anonymous reviewers are acknowledged for helpful comments and suggestions.


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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Biophysics SB RASKrasnoyarsk Scientific CenterAkademgorodok, KrasnoyarskRussia
  2. 2.Siberian Federal UniversityKrasnoyarskRussia

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