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Filatova T., Aleshina E., Kleschenkov A. Taganrog bay in winter: hydrochemical components distribution / annotation

Filatova Tatyana – scientific worker. Southern scientific center of Russian Academy of Science. Rostov-on-Don, Russian Federation.
Aleshina Elena – engineer-researcher. Southern scientific center of Russian Academy of Science. Rostov-on-Don, Russian Federation.
Kleschenkov Alexey – candidate of geology, head of the department. Southern scientific center of Russian Academy of Science. Rostov-on-Don, Russian Federation.

Information about Taganrog bay hydrochemical regime in winter period has irregular character and generally concerns water chemistry research. In the period of ice formation, when the wind has no dominant influence, when the activity of planktonic community decreases, chemical substances transformation processes slow down, river runoff decreases, ice cover restricts oxygen income into water, not only alteration of biogenic matters hydrochemical fields represents a special interest, but also their distribution in snowpack, in ice and in subglacial water. In winter 2006, 2007, 2014, 2015 and 2016 the South scientific centre RAS and Institute of arid zone SSC RAS conducted hydrochemical researches in Don river estuary and in the littoral part of Taganrog bay, in the process of which the probes of snow, ice and subglacial water were analyzed and selected to determine nitrites, nitrates, ammonia nitrogen, attenuated nitrogen, gross nitrogen, phosphates, attenuated phosphorus, gross phosphorus, silicon, dissolved substances, suspended substances, heavy metals (Fe, Cu, Pb, Mn, Cr). Selection of snow ice and subglacial water probes and their analysis were conducted according to standard methods, recommended for using under ocean hydrochemical researches. In December 2006 nitrites content in the water probes was changed within the interval 5–4, nitrates 55–810, phosphates 23–163 mgk/l, the general admixtures content varied within the range 852–3983 mg/l. In the beginning of February 2007 nitrites and nitrates in the subglacial water were three times more, phosphates – 10 times, dissolved substances – 9 times more, than in the ice. In comparison with snow in subglacial water phosphates were 23 times more, dissolved substances –in 47 times more. Suspended substances in the water probes were the same as in the snow probes, but in the ice probes – 1,4 times more than in the subglacial water probes. In the end of 2007 nitrites in the subglacial water were 1,3 times more, nitrates – 7,5 times more, phosphates – 4 times more, dissolved substances – 22 times more than in the ice. In the same time suspended substances content in water was the same, as in the ice probes. Content determination of heavy metals (Fe, Cu, Pb, Mn, Cr) in the probes of snow and ice showed that ferrum, cuprum and manganese were 2 times more in snow than in ice. Content of lead and chrome in snow was significantly more in 1,2 and 1,4 times than in ice. Thus, during researches conduction concentration of nitrites, nitrates, phosphates and the admixtures general content were maximum in the subglacial water. Minimum quantity of nitrites and nitrates were detected in the probes of ice, the minimum concentration of phosphates, attenuated and suspended substances – in the probes of snow. In February 2014 concentration of nitrites in subglacial water varied within the limits 10,0–20,0, nitrates –143,0–483,0, phosphates – 12,0–47,0 mgk/l. In February 2015 content of nitrites in subglacial water was changed within the range 4,0–24,0, nitrates – 1110,0–3090,0, phosphates – 3,0–77,0 mgk/l. In February 2016 ammonium ions content in subglacial water was changed within the interval 60–140,0, nitrites –15,0–24,0, nitrates –290,0–1120,0, gross nitrogen 910,0–2310,0, phosphates –5,0–54,0, gross phosphorus 98,0–221,0, silicon 2100,0–7000,0 mgk/l. Decrease of amplitude concentrations contraction for all biogenic matters according to the distance from esturial seashore and river runoff influence decrease is characterized for all biogenic matters. Realization of systematic hydrochemical observations during the whole year and study of hydrochemical components distribution in snow, ice and subglacial water have a great theoretical and practical significance during the forecasting of hydrochemical regime and water quality of water objects.

Key words: Taganrog bay, winter period, hydrochemic regime, biogenic elements, salty water, ice.

Filatova T., Kleschenkov A., Aleshina E., Soiyer V. Hydrological and hydrochemical characteristics of lake Manych-Gudilo water / annotation

Tatyana B. Filatova – scientific worker. Southern scientific center of Russian Academy of Science. Rostov-on-Don, Russian Federation.
Alexey V. Kleschenkov – candidate of geology, head of the department. Southern scientific center of Russian Academy of Science. Rostov-on-Don, Russian Federation.
Elena G. Aleshina – Federal Research Center of the Southern Scientific Center of the Russian Academy of Sciences. Rostov-on-Don, Russian Federation.
Vyacheslav G. Soiyer – candidate of chemical studies. Federal Research Center of the Southern Scientific Center of the Russian Academy of Sciences. Rostov-on-Don, Russian Federation.

Scientific research works on studying the processes taking place in the Manych reservoirs are aimed not only at obtaining new scientific knowledge, but also assessing the impact of these changes on the species diversity dynamics and the structural and functional organization of communities of hydrobionts and semiaquatic fauna, as well as developing measures for optimization of water-salt balance, ecological conditions of the Manych Cascade reservoirs bioresources conservation and reproduction. Information on the current mineralization and the ionic composition state of the Proletarian Reservoir waters is important to understand their origin, the possibility of using them for economic purposes, assessing their transformation, and their influence on the environment and biota. It was found that the total mineralization in the surveyed water area in the period of autumn observations remains at a high level (45 g / l), as in 2010 and 2011. (42.7 and 42.6 respectively). The waters at most stations were attributed to brines, the most western station - to the waters of high salinity. Class of waters is chloride, sodium group, type II. The observed lateral gradient of salinity in the surveyed section of the Proletarian Reservoir is the process of mixing waters with different salinity. The data obtained from expeditionary studies served as the basis for a database on the Proletarian Reservoir (Lake Manych-Gudilo) ecosystem state.

Key words: lake Manych-Gudilo, ecological conditions, water-salt balance, ionic composition, biogenic substances.

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