9 research outputs found

    Chemical Composition of Bottom Sediments in Small Mountain Rivers (Altai, the Russian Federation)

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    The article deals with the chemical composition of bottom sediments in the small mountain rivers Aktru, Tyute, and Uznezya (Altai, Russia). It is established that as compared to small and middle plain rivers in Taiga zone, Siberia bottom sediments of the Aktru River contain less amount of K, Na, V, Cr, Mn, Ni, Al, Si, Ti, Sr, approximately the same - Fe, Co, Cu, Zn, Pb and more - As, Ca, Mg. It is suggested that there is a sharp increase of relative Al, Na, K and Si shares from the upland to lowland due to both weathering products accumulation of primary alumosilicates in bottom sediments and export of Ca and Mg from them when dissolving carbonate minerals. Composition transformations of bottom sediments is non-linear and considerably depends on composition of underlying and water-bearing rocks and water exchange intensity that manages time, conditions, and stages of interactions in "water - organic matter - rock" system

    Climate of West Siberia during the slowing phase of warming (1986–2015) and prediction of hydro-climatic resources for 2021–2030

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    The relevance of the study. The most visible affect of the present climate change is the rise of surface air temperature. Regional and local indicators of climate change differ from the global characteristics. Transformation of the hydrological cycle, water balance, river runoff in its turn affects climate processes. In order to predict the response of geosystems and their hydro-climatic resources to climate change it is necessary to have a clear vision of contemporary climate change and its projections for the coming decades in specific geographical localities. The aim of the study is (1) to assess the climate change over West Siberia on the basis of statistical analysis of monthly air temperature and precipitation time series up to 2015, (2) predict the average air temperature and precipitation fields for the 2021-2030, and (3) determine the climate-driven changes in water balance and water flow regime over the study area. The methods used in the study. Analysis and forecasting of spatial and temporal variability of surface air temperature and precipitation rates at meteorological stations in the region are made by statistical methods in the StatSoft STATISTICA package (regression analysis, trend analysis, cluster analysis to classify objects, exponential smoothing and forecasting). The averaged monthly land water balance constituents are determined for the base (1966-1985), current (1986-2015) and forecast (2021-2030) using the method of hydrological and climatical calculations developed by V.S. Mezentsev. The results. It is shown that the modern 30yrs climatic period differs from the previous one in higher energy level (air temperature). Against this background, not only upward but downward temperature trends in some months are observed. The authors have predicted the average temperatures and precipitation rates in a cold season and monthly temperatures and precipitation in a warm season of the year at 31 meteorological stations for 2021-2030. The estimates for the current and forecast periods made it possible to compute the average regime parametres of precipitation, evapotranspiration, runoff and moisture of soil active layer at the meteorological stations located in different lanscape zones and regions of West Siberian plain. The projected increase in temperature and evapotranspiration does not lead to the expected decrease in flow even in the southern dry regions. At the same time, soil moisture in summer will decrease everywher

    Chemical Composition of Bottom Sediments in Small Mountain Rivers (Altai, the Russian Federation)

    Get PDF
    The article deals with the chemical composition of bottom sediments in the small mountain rivers Aktru, Tyute, and Uznezya (Altai, Russia). It is established that as compared to small and middle plain rivers in Taiga zone, Siberia bottom sediments of the Aktru River contain less amount of K, Na, V, Cr, Mn, Ni, Al, Si, Ti, Sr, approximately the same – Fe, Co, Cu, Zn, Pb and more – As, Ca, Mg. It is suggested that there is a sharp increase of relative Al, Na, K and Si shares from the upland to lowland due to both weathering products accumulation of primary alumosilicates in bottom sediments and export of Ca and Mg from them when dissolving carbonate minerals. Composition transformations of bottom sediments is non-linear and considerably depends on composition of underlying and water-bearing rocks and water exchange intensity that manages time, conditions, and stages of interactions in “water – organic matter – rock” system

    Chemical Composition of Bottom Sediments in Small Mountain Rivers (Altai, the Russian Federation)

    No full text
    The article deals with the chemical composition of bottom sediments in the small mountain rivers Aktru, Tyute, and Uznezya (Altai, Russia). It is established that as compared to small and middle plain rivers in Taiga zone, Siberia bottom sediments of the Aktru River contain less amount of K, Na, V, Cr, Mn, Ni, Al, Si, Ti, Sr, approximately the same – Fe, Co, Cu, Zn, Pb and more – As, Ca, Mg. It is suggested that there is a sharp increase of relative Al, Na, K and Si shares from the upland to lowland due to both weathering products accumulation of primary alumosilicates in bottom sediments and export of Ca and Mg from them when dissolving carbonate minerals. Composition transformations of bottom sediments is non-linear and considerably depends on composition of underlying and water-bearing rocks and water exchange intensity that manages time, conditions, and stages of interactions in “water – organic matter – rock” system

    Climate of West Siberia during the slowing phase of warming (1986–2015) and prediction of hydro-climatic resources for 2021–2030

    No full text
    The relevance of the study. The most visible affect of the present climate change is the rise of surface air temperature. Regional and local indicators of climate change differ from the global characteristics. Transformation of the hydrological cycle, water balance, river runoff in its turn affects climate processes. In order to predict the response of geosystems and their hydro-climatic resources to climate change it is necessary to have a clear vision of contemporary climate change and its projections for the coming decades in specific geographical localities. The aim of the study is (1) to assess the climate change over West Siberia on the basis of statistical analysis of monthly air temperature and precipitation time series up to 2015, (2) predict the average air temperature and precipitation fields for the 2021-2030, and (3) determine the climate-driven changes in water balance and water flow regime over the study area. The methods used in the study. Analysis and forecasting of spatial and temporal variability of surface air temperature and precipitation rates at meteorological stations in the region are made by statistical methods in the StatSoft STATISTICA package (regression analysis, trend analysis, cluster analysis to classify objects, exponential smoothing and forecasting). The averaged monthly land water balance constituents are determined for the base (1966-1985), current (1986-2015) and forecast (2021-2030) using the method of hydrological and climatical calculations developed by V.S. Mezentsev. The results. It is shown that the modern 30yrs climatic period differs from the previous one in higher energy level (air temperature). Against this background, not only upward but downward temperature trends in some months are observed. The authors have predicted the average temperatures and precipitation rates in a cold season and monthly temperatures and precipitation in a warm season of the year at 31 meteorological stations for 2021-2030. The estimates for the current and forecast periods made it possible to compute the average regime parametres of precipitation, evapotranspiration, runoff and moisture of soil active layer at the meteorological stations located in different lanscape zones and regions of West Siberian plain. The projected increase in temperature and evapotranspiration does not lead to the expected decrease in flow even in the southern dry regions. At the same time, soil moisture in summer will decrease everywher

    Сhemical composition of bottom sediments in small mountain rivers (Altai, the Russian Federation)

    No full text
    The article deals with the chemical composition of bottom sediments in the small mountain rivers Aktru, Tyute, and Uznezya (Altai, Russia). It is established that as compared to small and middle plain rivers in Taiga zone, Siberia bottom sediments of the Aktru River contain less amount of K, Na, V, Cr, Mn, Ni, Al, Si, Ti, Sr, approximately the same – Fe, Co, Cu, Zn, Pb and more – As, Ca, Mg. It is suggested that there is a sharp increase of relative Al, Na, K and Si shares from the upland to lowland due to both weathering products accumulation of primary alumosilicates in bottom sediments and export of Ca and Mg from them when dissolving carbonate minerals. Composition transformations of bottom sediments is non-linear and considerably depends on composition of underlying and water-bearing rocks and water exchange intensity that manages time, conditions, and stages of interactions in “water – organic matter – rock” system

    Conditions of formation of high-water flood and flood forecast on the river Abakan

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    The relevance of the work is caused by climate change and increase in frequency of occurrence of dangerous hydrological phenomena on the rivers of the southern Siberian mountains. As a consequence the social and economic damage grows. The aim of the research is to analyze the conditions of formation of spring flood high water content on the river Abakan, to identify hydro-climatic laws as a basis for predicting the probability of formation of extremely high flow rates. Methods: complex geographical and hydrometeorological analysis, identification of prognostic data dependencies of long-term meteorological observations using the methods of mathematical statistics. Results. The authors have revealed four types of the tide of spring flood high water content (probability is less than 33,3 %), which differ in the degree of danger to human settlements and industrial facilities on the banks of river Abakan. The main factors of the formation of the flood high water content tide are the following: 1) increased amount of winter precipitation - at average the sum of rainfall catchment from November to March is 10 % above the norm; 2) abundant, mainly liquid, April precipitation. The amount of precipitation in April, according to the data of weather stations Neozhidanny and Tashtyp, is above normal by 25 and 50 %, respectively. The authors proposed the technique of flood prediction based on searching for the so-called «Extremality flood factor»

    Climate of West Siberia during the slowing phase of warming (1986-2015) and prediction of hydro-climatic resources for 2021-2030

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    Актуальность. Наиболее очевидным проявлением климатических изменений в настоящее время является повышение приземной температуры воздуха. Региональные и локальные показатели изменения климата отличаются от глобальных. Происходит трансформация гидрологического цикла, водного баланса территории, стока рек, что, в свою очередь, сказывается на климатических процессах. Для предсказания реакции геосистем и их гидроклиматических ресурсов на климатические изменения необходимо иметь четкие представления о характере современных изменений климата и прогнозные оценки на ближайшие десятилетия с конкретной географической привязкой. Цель работы: 1) оценка климатических изменений на территории Западной Сибири на основе статистического анализа рядов месячных температур воздуха и атмосферных осадков по состоянию на 2015 г., 2) прогноз поля средних за период 2021-2030 гг. температур воздуха и осадков и 3) определение климатообусловленных изменений водного баланса территории и режима стока воды. Методы исследования. Анализ и прогнозирование пространственно-временной изменчивости наблюдаемой на метеостанциях региона приземной температуры воздуха и атмосферных осадков выполнены статистическими методами в пакете STATISTICA (регрессионный анализ, анализ трендов, кластер анализ для классификации объектов, экспоненциальное сглаживание и прогнозирование). Средние за базовый (1966-1985), современный (1986-2015) и прогнозный (2021-2030 гг.) периоды оценки составляющих водного баланса суши определены с месячным разрешением методом гидролого-климатических расчетов В.С. Мезенцева. Результаты. Показано, что современный 30-летний климатический период отличается от предыдущего более высоким энергетическим уровнем (температурами воздуха), но на этом фоне в некоторые месяцы наблюдаются не только восходящие, но и нисходящие тенденции температуры. Выполнен прогноз средних температур и осадков по 31 метеостанции на период 2021-2030 гг. за зиму и, по месяцам - за теплый период года. Оценки за современный и прогнозный периоды позволили рассчитать средние показатели режима осадков, испарения, стока воды и влажности деятельного слоя почвы по данным метеостанций, расположенных в разных природных зонах Западно-Сибирской равнины. Прогнозируемый рост температуры и испарения не приводит к ожидаемому снижению стока даже в южных районах недостаточного увлажнения. В то же время влажность почвы в летний период, согласно расчетам, повсеместно снизится.The relevance of the study. The most visible affect of the present climate change is the rise of surface air temperature. Regional and local indicators of climate change differ from the global characteristics. Transformation of the hydrological cycle, water balance, river runoff in its turn affects climate processes. In order to predict the response of geosystems and their hydro-climatic resources to climate change it is necessary to have a clear vision of contemporary climate change and its projections for the coming decades in specific geographical localities. The aim of the study is (1) to assess the climate change over West Siberia on the basis of statistical analysis of monthly air temperature and precipitation time series up to 2015, (2) predict the average air temperature and precipitation fields for the 2021-2030, and (3) determine the climate-driven changes in water balance and water flow regime over the study area. The methods used in the study. Analysis and forecasting of spatial and temporal variability of surface air temperature and precipitation rates at meteorological stations in the region are made by statistical methods in the StatSoft STATISTICA package (regression analysis, trend analysis, cluster analysis to classify objects, exponential smoothing and forecasting). The averaged monthly land water balance constituents are determined for the base (1966-1985), current (1986-2015) and forecast (2021-2030) using the method of hydrological and climatical calculations developed by V.S. Mezentsev. The results. It is shown that the modern 30yrs climatic period differs from the previous one in higher energy level (air temperature). Against this background, not only upward but downward temperature trends in some months are observed. The authors have predicted the average temperatures and precipitation rates in a cold season and monthly temperatures and precipitation in a warm season of the year at 31 meteorological stations for 2021-2030. The estimates for the current and forecast periods made it possible to compute the average regime parametres of precipitation, evapotranspiration, runoff and moisture of soil active layer at the meteorological stations located in different lanscape zones and regions of West Siberian plain. The projected increase in temperature and evapotranspiration does not lead to the expected decrease in flow even in the southern dry regions. At the same time, soil moisture in summer will decrease everywhere
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