Forming the Chemical Composition of Surface Waters in The Arctic (Case Study of The Lake-River System of The Paz River)

Lead Author Svetlana, Mazukhina
Institution Contact Institute of North Industrial Ecology Problems KSC RAS 184209 Apatity, Murmansk region. Akademgorodok, 14a
Co-Authors Vladimir Masloboev, Institute of North Industrial Ecology Problems KSC RAS, Russia Sergey Sandimirov, Institute of North Industrial Ecology Problems KSC RAS, Russia Stanislav Ivanov, Institute of North Industrial Ecology Problems KSC RAS, Russia
Theme Theme 1: Vulnerability of Arctic Environments
Session Name 1.2 Fresh Water in the Arctic Climate System: Consequences of Global Climate Change and Future Projections of the Arctic Environment
Datetime Thu, Sep 15, 2016 01:45 PM - 02:00 PM
Presentation Type Oral
Abstract text Due to the depletion of fresh water supplies and the deterioration of their quality as a result of anthropogenic impact on the Arctic ecosystems, study of forming quality of surface and underground waters, their interactions with rock, development of the basis for their rational use and protection have both fundamental and big practical importance and require continuation of the detailed studies, including use of physical-chemical modeling methods.
The Paz River is the largest river in northern Fennoscandia and flows through three countries (Russia, Norway, Finland). According to the long-term monitoring data of the chemical composition of surface waters of the river and the study of the chemical composition of rocks, the physical-chemical modeling (FCM) (Selector Software) was carried out. The FCM included 34 independent components (Al-B-Br-Ar-He-Ne-C- Ca-Cl-F-Fe-K-Mg-Mn-N-Na-PS-Si-Sr-Cu-Zn-Ni-Pb-V-Ba-Co-Cr-Hg-As-Cd-H-O-e), 996 dependent components, including those in aqueous solution - 369, in the gas phase - 76, liquid hydrocarbons - 111, solid phases, organic and mineral substances - 440. The set of solid phases of the multisystem was formed taking into consideration the mineral composition of the Baltic shield.
The processes of forming surface waters in the system "water - rock - atmosphere" were investigated depending on the degree of interaction (ξ) of rocks with aqueous solutions under open conditions, rock - orthoclase gabbro and amphibolized olivine pyroxenites. The composition of these rocks contained the maximum amounts of calcium and sodium - the elements whose concentrations affect the chemical composition of surface waters and the pH.
The results show that the chemical composition of waters of the Paz River and Lake Kuetsyarvi included in the lake-river system were formed by the weathering of intrusive rocks of the Pechenga nickel complex and differ by the degree of “water-rock” interactions.
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