Abstract
In this study the laboratory analysis of water samples from three representative regions of the Arctic for content of coloured dissolved organic matter (CDOM) – the important component of natural waters, which has a direct impact on state of aquatic ecosystems, was made. Samples were collected from water objects from the Kola Peninsula, the Yamal Peninsula and the Lena River Delta. The results of the analysis made it possible to determine CDOM concentrations in water. According to the average values, the highest values were obtained for the Yamal Peninsula and lowest – for the Kola Peninsula. The predominance of allochthonous CDOM in the water objects from all three regions was revealed. Moreover, the complete absence of photodegradation processes was determined. For the lakes and rivers from the Kola Peninsula it was also possible to follow seasonal dynamic of CDOM concentration in water and to compare it with earlier obtained data concerning seasonal CDOM dynamic in the Lena River Delta. Results are actual due to the currently existing tendency of climate change which leads to intensification of thermal denudation and thermal erosion processes in the cryolithozone, which are consequently increasing income of allochthonous CDOM in water objects.
Highlights
IntroductionVast territories of the Arctic and Subarctic of Russia adjacent to the Arctic Ocean are still relatively little studied in terms of the compound and state of surface waters
Vast territories of the Arctic and Subarctic of Russia adjacent to the Arctic Ocean are still relatively little studied in terms of the compound and state of surface waters.Nowadays, the United Nations Environment Program (UNEP) identifies climate change among the actual environmental problems of the Arctic that entails the intensification of the processes of thermal denudation and thermal erosion in the cryolithozone, which are affecting the water objects located there by increasing the concentration of dissolved organic matter (DOM).Today, it is known that an excess of DOM in water has a direct impact on the ecological state of aquatic ecosystems
The United Nations Environment Program (UNEP) identifies climate change among the actual environmental problems of the Arctic that entails the intensification of the processes of thermal denudation and thermal erosion in the cryolithozone, which are affecting the water objects located there by increasing the concentration of dissolved organic matter (DOM)
Summary
Vast territories of the Arctic and Subarctic of Russia adjacent to the Arctic Ocean are still relatively little studied in terms of the compound and state of surface waters. The United Nations Environment Program (UNEP) identifies climate change among the actual environmental problems of the Arctic that entails the intensification of the processes of thermal denudation and thermal erosion in the cryolithozone, which are affecting the water objects located there by increasing the concentration of dissolved organic matter (DOM). The increase of CDOM concentrations causes the changes in the ecological status of aquatic ecosystems, which justifies the necessity of CDOM monitoring organization and actuality of this topic. The goal of the work is to provide the CDOM parameters in the Arctic aquatic ecosystems and the spatial and temporal features of its dynamic in year 2019. Aquatic ecosystems of three regions: the Yamal Peninsula, the Lena River Delta and the Kola Peninsula, were chosen as the objects of the study
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