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

A model study of the effect of weather forcing on

the ecology of a meromictic Siberian lake

Igor G.PROKOPKIN[1];Egor S.ZADEREEV[1,2];;;

【期刊名称】《海洋湖沼学报（英文）》 【年(卷),期】2024(036)006

【摘要】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 oxic-anoxic interface is also detectable.However,intra-and interannual climate and weather effects will be more important for the control of meromixis stability.

【总页数】15页(P.2024-2032)

【关键词】meromictic lake;numerical model;weather forcing;sensitivity analysis;stratifi cation;food web

【作者】Igor G.PROKOPKIN[1];Egor S.ZADEREEV[1,2];;;

【作者单位】[1]Institute of Biophysics SB RAS,Krasnoyarsk Scientific Center,660036,Akademgorodok,Krasnoyarsk,Russia;;[1]Institute

of

Biophysics SB RAS,Krasnoyarsk Scientific

Center,660036,Akademgorodok,Krasnoyarsk,Russia;[2]Siberian Federal University,660079,Svobodniiav.79,Krasnoyarsk,Russia; 【正文语种】英文 【中图分类】P 【文献来源】

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