1:45 PM - 2:00 PM
[MIS01-11] Eutrophication of Arctic lakes under climate change: Case study of the Kola region
Keywords:eutrophication, small lakes, nutrients, trophic status
In the last century, the problem of biogeochemical migration elements and the development of lakes eutrophication has become acute due to the uncontrolled entry of a huge amount of nutrients and organic substances into the biotic cycle. The Arctic regions have a huge fund of small oligotrophic lakes that are not directly affected by human activity. However, the effects of global phosphorus dissipation and climate warming may also affect remote lakes.
The assessment of biogeochemical changes in the lakes, which were not directly affected by human activity, and the impact of climate warming on these lakes was based on the analysis of water quality long-term monitoring from 1990 to 2018 (once per 4 to 5 years).
Studies have shown that in the recent period there has been a significant increase in the content of total phosphorus and nitrogen against the background of maintaining the concentrations of their bioavailable forms, which indicates a rapid utilization of the latter in production processes. At the same time, the growth of organic matter in the tundra zone was proved, which shows a significant relationship with the surface air temperature for the growing season.
According to the lake trophic status indicator introduced by R. Carlson (TSI), it is shown that the number of oligotrophic lakes has decreased and the number of meso- and eutrophic lakes has increased even in cases where there is no influence of any anthropogenic factors.
This study was supported by grants from the Russian Foundation for Basic Research (grant No. 22-1700061/22).
The assessment of biogeochemical changes in the lakes, which were not directly affected by human activity, and the impact of climate warming on these lakes was based on the analysis of water quality long-term monitoring from 1990 to 2018 (once per 4 to 5 years).
Studies have shown that in the recent period there has been a significant increase in the content of total phosphorus and nitrogen against the background of maintaining the concentrations of their bioavailable forms, which indicates a rapid utilization of the latter in production processes. At the same time, the growth of organic matter in the tundra zone was proved, which shows a significant relationship with the surface air temperature for the growing season.
According to the lake trophic status indicator introduced by R. Carlson (TSI), it is shown that the number of oligotrophic lakes has decreased and the number of meso- and eutrophic lakes has increased even in cases where there is no influence of any anthropogenic factors.
This study was supported by grants from the Russian Foundation for Basic Research (grant No. 22-1700061/22).