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Найдено документов в текущей БД: 9

    Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002-2009
[Text] / D.Y. Rogozin [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 485-496, DOI 10.1007/s10452-010-9328-6. - Cited References: 27. - We thank Mr. Fyodor Kozlov for assistance in winter lake surveys, Dr. Alexander Tolomeev and Dr. Egor Zadereev (Institute of Biophysics SD RAS) for field data of August 2006, Dr. Galina Kalacheva (Institute of Biophysics SD RAS) for ash content determination and all others who helped us in expeditions. We are also very grateful to Dr. Wolf Mooij (Netherlands Institute of Ecology) and two anonymous reviewers for valuable comments and advice on article preparation. This work was partly supported by the Netherlands Organization for Scientific Research, Grant 047.011.2004.030, the Russian Foundation for Basic Research, Grants No. 09-04-01114-a and 09-05-00915-a, by Siberian Branch of Russian Academy of Sciences, Integrative Project No. 95 and joint Taiwan-Siberian Project No. 149, by Russian Academy of Sciences, Program No. 23.15, by award No. PG07-002-1 of the Ministry of Education and Sciences of Russian Federation and U.S. Civilian Research & Development Foundation for the Independent States of the Former Soviet Union (CRDF). . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
PHOTOTROPHIC SULFUR BACTERIA
   MONO LAKE

   CHEMOCLINE

Кл.слова (ненормированные):
Meromixis -- Mixolimnion -- Oxic-anoxic interface -- Thermocline -- Weather conditions -- 1-D model

Аннотация: In a brackish, temperate, 24-m-deep Lake Shira, the profiles of salinity, temperature, oxygen and sulfide concentrations were measured on a seasonal basis from 2002 to 2009. The lake was shown to be meromictic with autumnal overturn restricted to mixolimnion. The depth of mixolimnion and position of oxic-anoxic interface varied annually. The spring mixing processes contribute to the formation of mixolimnion in autumn. The exceptionally windy spring of 2007 caused the deepening of mixolimnion in the winter of 2008. The winter position of oxic-anoxic interface was affected by the position of lower boundary of mixolimnion in all winters. The salinity in the winter mixolimnion increased compared with the autumn because of freezing out of salts from the upper water layers meters during ice formation and their dissolution in water below. The profiles of salinity and temperature were simulated by the mathematical 1-D model of temperature and salinity conditions taking into account ice formation. The simulated profiles generally coincided with the measured ones. The coincidence implies that simplified one-dimensional model can be applied to roughly describe salinity and density profiles and mixing behavior of Lake Shira.


Доп.точки доступа:
Rogozin, D.Y.; Genova, S.N.; Генова, Светлана Николаевна; Gulati, R.D.; Degermendzhy, A.G.

    Numerical modeling of vertical stratification of Lake Shira in summer
[Text] / P.V. Belolipetsky [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 561-570, DOI 10.1007/s10452-010-9330-z. - Cited References: 35. - The study was financially supported by the Netherlands Organization for Scientific Research (NWO), Grant 047.011.2004.030, RFBR, Grant 05-05-89002; RFBR, Grant 07-01-00153; Multidisciplinary integration project of SB RAS No. 95. . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology

Аннотация: A one-dimensional numerical model and a two-dimensional numerical model of the hydrodynamic and thermal structure of Lake Shira during summer have been developed, with several original physical and numerical features. These models are well suited to simulate the formation and dynamics of vertical stratification and provide a basis for an ecological water-quality model of the lake. They allow for the quantification of the vertical mixing processes that govern not only the thermal structure but also the nutrient exchange, and more generally, the exchange of dissolved and particulate matter between different parts of the lake. The outcome of the calculations has been compared with the field data on vertical temperature and salinity distributions in Lake Shira. Lake Shira is meromictic and exhibits very stable annual stratification. The stratification is so stable because of the high salinity of the water. If the water in Lake Shira were fresh and other parameters (depth, volume, and meteorology) were the same, as now, the lake would be mixed in autumn. Using the newly developed models and using common meteorological parameters, we conclude that Lake Shira will remain stratified in autumn as long as the average salinity is higher than 3%.


Доп.точки доступа:
Belolipetsky, P.V.; Белолипецкий, Павел Викторович; Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Genova, S.N.; Генова, Светлана Николаевна; Mooij, W.M.

    A one-dimensional model of vertical stratification of Lake Shira focussed on winter conditions and ice cover
[Text] / S.N. Genova [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 571-584, DOI 10.1007/s10452-010-9327-7. - Cited References: 26. - The study was financially supported by the Netherlands Organization for Scientific Research (NOW), Grant 047.011.2004.030; RFBR, Grant 05-05-89002; RFBR, Grant 07-01-00153; Multidisciplinary integration project of SB RAS No. 95. . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
SEA ICE
   BACTERIA

   DEPTH

Кл.слова (ненормированные):
Convective mixed layer -- Ice formation -- Ice melting -- Simplified model -- Winter profiles

Аннотация: In meromictic lakes such as Lake Shira, horizontal inhomogeneity is small in comparison with vertical gradients. To determine the vertical distribution of temperature, salinity, and density of water in a deep zone of a Lake Shira, or other saline lakes, a one-dimensional (in vertical direction) mathematical model is presented. A special feature of this model is that it takes into account the process of ice formation. The model of ice formation is based on the one-phase Stefan problem with the linear temperature distribution in the solid phase. A convective mixed layer is formed under an ice cover due to salt extraction in the ice formation process. To obtain analytical solutions for the vertical distribution of temperature, salinity, and density of water, we use a scheme of vertical structure in the form of several layers. In spring, the ice melts as top and bottom. These processes are taken into account in the model. The calculated profiles of salinity and temperature of Shira Lake are in good agreement with field measurement data for each season. Additionally, we focussed on the redox zone, which is the zone in which the aerobic layers of a water column meet the anaerobic ones. Hyperactivity of plankton communities is observed in this zone in lakes with hydrogen sulphide monimolimnion, and Lake Shira is among them. The location of the redox zone in the lake, which is estimated from field measurements, coincides with a sharp increase in density (the pycnocline) during autumn and winter. During spring and summer, the redox zone is deeper than the pycnocline. The location of pycnocline calculated with the hydro physical model is in good agreement with field measurement data.


Доп.точки доступа:
Genova, S.N.; Генова, Светлана Николаевна; Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Rogozin, D.Y.; Degermendzhy, A.G.; Mooij, W.M.

    Numerical algorithm for studying wind flows two-dimensional in the vertical plane in stratified reservoirs
[Text] / V.M. Belolipetskii, P.V. Belolipetskii // Russ. J. Numer. Anal. Math. Model. - 2010. - Vol. 25, Is. 1. - pp. 1-14, DOI 10.1515/RJNAMM.2010.001. - Cited References: 13. - The work was supported by the Russian Foundation for Basic Research (07-01-00153) and Interdisciplinary Project No. 95 of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 0927-6467
РУБ Engineering, Multidisciplinary + Mathematics, Applied

Аннотация: A system of equations of geophysical hydrothermodynamics of the ocean in the Boussinesq, hydrostatic, and 'rigid lid' approximations is used for description of stratified flows in landlocked reservoirs. A numerical algorithm is considered for flows two-dimensional in the vertical plane. This algorithm is based on the method of splitting with respect to physical processes, the finite element method, and the upstream difference scheme. The numerical algorithm has been checked on test problems. The model was used for determination of wind circulation and vertical distributions of temperature and salinity in the Shira Lake. The results of numerical modelling are in good agreement with actual data.


Доп.точки доступа:
Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Belolipetskii, P.V.; Белолипецкий, Павел Викторович

    Baroclinic seiches for three-layer density stratification in the basin of rectangular shape
/ V. M. Belolipetskii [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2015. - Vol. 8, Is. 2. - P148-156 . - ISSN 1997-1397
Аннотация: The problem of linear baroclinic seiches in rectangular basin is considered. It is supposed that density is stratified into three layers. Internal waves are not taken into account. It is shown that one-dimensional model allows one to determine the positions of thermocline and halocline. The model also allows one to determine the values of temperature and salinity in the surface and bottom layers with satisfactory accuracy. Fluctuations of temperature and salinity in pycnocline are estimated by calculating parameters of baroclinic seiches. The results of calculations and measurements in Lake Shira are compared. © Siberian Federal University. All rights reserved.

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Держатели документа:
Institute of Computational Modelling SB RAS, Akademgorodok, 50/44, Krasnoyarsk, Russian Federation
Institute of Mathematics and Computer Science, Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Biophysics SB RAS, Akademgorodok, 50/50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Genova, S.N.; Генова, Светлана Николаевна; Degermendzhy, A.G.; Tolomeyev, A.P.

    HORIZONTALLY INHOMOGENEOUS DENSITY EFFECT ON LAKE SHIRA HYDROPHYSICS IN 3D SIMULATION
/ T. Iakubailik, L. Kompaniets // WATER, RESOURCES, FOREST, MARINE AND OCEAN ECOSYSTEMS CONFERENCE : STEF92 TECHNOLOGY LTD, 2016. - 16th International Multidisciplinary Scientific Geoconference (SGEM (JUN 30-JUL 06, 2016, Albena, BULGARIA). - P407-414. - (International Multidisciplinary Scientific GeoConference-SGEM). - Cited References:7 . -
РУБ Water Resources

Кл.слова (ненормированные):
salt stratified lake -- mathematical modelling

Аннотация: Salt stratified Lake Shira is the subject of extensive research because of its central role in the Khakassia (Russia) resort area. Hydro regime influences both biological and chemical properties of a lake. Generally mathematical modelling of Lake Shira hydrophysics was based on assumption of a uniform horizontal initial distribution of salinity. It was believed that freshening had little effect on the lake hydrophysics because of the small Son River tributary. This work is an attempt to determine the effect of freshened lake area on the lake hydrophysics and its ecological condition. 3D mathematical modelling based on modern computer packages is used to study in detail the influence of non-uniform salinity due to the influx of the Son River on the flow structure in Lake Shira. Numerical simulation has shown that even a relatively small area of fresh water in shallow part of this lake has a significant impact on the wind currents in the lake if they are accompanied by internal waves

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Держатели документа:
RAS, ICM SB, Krasnoyarsk, Russia.

Доп.точки доступа:
Iakubailik, Tatiana; Kompaniets, Lidiya

    Disturbance of meromixis in saline Lake Shira (Siberia, Russia): Possible reasons and ecosystem response
/ D. Y. Rogozin [et al.] // Limnologica. - 2017. - Vol. 66. - P12-23, DOI 10.1016/j.limno.2017.06.004 . - ISSN 0075-9511

Кл.слова (ненормированные):
Food chain -- Meromixis -- Mixing -- Mixolimnion -- Purple sulfur bacteria -- Stability -- Stratification -- Chromatiaceae -- Phytomastigophorea

Аннотация: Saline Lake Shira (Southern Siberia, Russia) was meromictic through the observation period 2002–2015. During the under-ice periods of 2015 and 2016, complete mixing of the water column was recorded for the first time, and hydrogen sulphide temporarily disappeared from the water column of the lake; i.e. in those years the lake turned to holomixis. In the summer of 2015, a sharp increase in chlorophyll a, organic carbon, zooplankton, and phytoflagellates was observed in the lake, which was probably due to the release of nutrients from the monimolimnion. Purple sulfur bacteria completely disappeared from the lake after the first mixing in 2015, and did not reappear despite the restoration of meromixis in 2017. Thus, it was demonstrated that purple sulfur bacteria are sensitive to the weakening of the stratification of Lake Shira. Based on the data of the seasonal monitoring of temperature and salinity profiles over the period 2002–2017, it was presumed that the main cause of deep mixing in 2015 was the weakening of the salinity gradient due to strong wind impact and early ice retreat in the spring of 2014. In addition, it was shown that in previous years a significant contribution to the maintenance of meromixis was made by an additional influx of fresh water, which caused a rise in the lake level in the period 2002–2007. Thus, we identified a relationship between the stratification regime of the lake and the change in its level, which provides valuable information both for the forecast of water quality and for reconstruction of the Holocene climate humidity in this region of Southern Siberia from the sediment cores of Lake Shira. © 2017 Elsevier GmbH

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Держатели документа:
Institute of Biophysics Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Computing Modeling Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Rogozin, D. Y.; Tarnovsky, M. O.; Belolipetskii, V. M.; Zykov, V. V.; Zadereev, E. S.; Tolomeev, A. P.; Drobotov, A. V.; Barkhatov, Y. V.; Gaevsky, N. A.; Gorbaneva, T. B.; Kolmakova, A. A.; Degermendzhi, A. G.

    Flow analysis in closed oval-shaped salt lake based on numerical modeling and field observations in summer
/ T. Iakubailik, L. Kompaniets // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM : International Multidisciplinary Scientific Geoconference, 2018. - Vol. 18: 18th International Multidisciplinary Scientific Geoconference, SGEM 2018 (2 July 2018 through 8 July 2018, ) Conference code: 142896, Is. 3.1. - P327-334, DOI 10.5593/sgem2018/3.1/S12.043 . -
Аннотация: A salt stratified Lake Shira has been the subject of extensive research because of its central role in the existence of the Khakassia resort area. The previous research was mainly aimed at water quality issues. The studies of the physical dynamics of Lake Shira relevant to the present work include the general observation of currents on the basis of the field experiments in 2011-2014. Velocity measurements were carried out using Doppler Current Profilers with frequency 600 kHz and 1200 kHz in the bottom track mode in 2012 and at several permanent stations in other years. Temperature measurements were performed using distributed temperature sensors at several stations. In the field observations, internal waves were detected. Three-dimensional primitive equation numerical model GETM is applied to simulate hydrophysical processes in Lake Shira. The model is hydrostatic and Boussinesq. The measured temperature and salinity distribution is taken as the initial data for computations. Computations with time constant wind and the initial horizontally homogeneous and vertically stratified density illustrate the dependence of three dimensional current on the wind strength and direction. The calculations with the variable wind speed show that the termination of the wind leads to the appearance of the internal waves. © SGEM2018 All Rights Reserved.

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Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Iakubailik, T.; Kompaniets, L.

    One-dimensional Model for Studying Seasonal Changes of Vertical Structure of Salt Lake Uchum
/ V. M. Belolipetskii [et al.] // J. Sib. Fed. Univ.-Math. Phys. - 2019. - Vol. 12, Is. 1. - P100-108, DOI 10.17516/1997-1397-2019-12-1-100-108. - Cited References:19. - The work was supported by the RFBR grants (16-05-00091) and Russian Foundation for Basic Research and the government of the region of the Russian Federation, grant 18-45-243002. . - ISSN 1997-1397. - ISSN 2313-6022
РУБ Mathematics
Рубрики:
CIRCULATION
Кл.слова (ненормированные):
salt lake -- one-dimensioanal vertical model -- temperature and salinity -- profiles of water

Аннотация: Many salt lakes are meromictic, in which the water column is not mixed to the bottom for at least one year. In the stratified lake, the upper (epilimnion) and deep (hypolimnion) layers are distinguished, in which the density gradients are small. Between them is a layer of water (metalimnion), within which the density gradient is great. In the near-bottom layer, hydrogen sulphide accumulates and there is no oxygen. One-dimensional mathematical models are used to determine the dynamics of the vertical thermohaline structure of the salt lake Uchum. Two periods in the annual regime are considered: the period of the absence of the ice cover (IC) and the period with the existence of the IC. The vertical distributions of temperature and water salinity in Lake Uchum have been calculated in different seasons. The results of the calculations are consistent with the data of field measurements.

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Держатели документа:
Inst Computat Modelling SB RAS, Akademgorodok 50-44, Krasnoyarsk 660036, Russia.
Inst Biophys SB RAS, Akademgorodok 50-50, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Belolipetskii, Victor M.; Genova, Svetlana N.; Degermendzhy, Andrey G.; Zykov, Vladimir V.; Rogozin, Denis Yu; RFBR [16-05-00091]; Russian Foundation for Basic Research; government of the region of the Russian Federation [18-45-243002]