7 research outputs found
Role of hydrometeorological factors and solar activity in interannual variability of ice extent in the East Siberian Sea (in Russian)
Get PDFInterannual changes of the summer ice coverage were investigated, and the role of hydrometeorological factors and solar activity in long-period fluctuations of the ice area in the East Siberian Sea was determined. Multivariate statistical analysis of time series of the ice cover, hydrometeorological elements, and the solar activity (SA), was performed for the period from 1950 to 2012 with regard for the cross-correlations of the analyzed variables that made possible to develop the equations of interannual fluctuations of the ice coverage in the East Siberian Sea in August and September. The equations include the following variables: air temperature in June–August of the current year TVI‑VIII; the atmospheric circulation presented by indices of Arctic oscillation (Arctic Oscillation, AO), Arctic dipole (Arctic Dipole, AD), Pacific North American oscillation (Pacific North American Oscillation, PNA); average annual runoff of river waters into the Laptev and East Siberian seas (RivLES) with a time shift of one and two years; average annual index of the North Atlantic thermal state (AMO) with a time lag of eight years; solar activity SA, presented by the average annual Wolf number with advancing of one year. Diagnostic calculations of the ice area by the obtained equations using the actual values of the indices did show a good agreement between the actual and calculated values in August and September from 1950 to 2012. These equations were used to calculate contribution of each factor to the general dispersion of fluctuations of the ice coverage. The most important factors influencing the ice cover of the Sea in August and September are: the air temperature; the atmospheric circulation, presented by the Arctic Oscillation at the end of winter; and Atlantic waters which are characterized by AMO with a time lag of eight years. The role of other factors, i.e. summer atmospheric circulation, river runoff into the above seas, and 11-year cycle of solar activity were found to be equal to only 5–10% for each. Basing on these estimates, it has been concluded that the obtained statistical equations may be used as the diagnostic models of interannual changes in the ice coverage
Ледовитость моря Лаптевых в условиях колебаний климата Арктики
Get PDFThe analysis on long-term fluctuations of the Laptev Sea ice coverage over a period of 1940–2014 has been performed. Large-scale cycle in ice extent anomalies change with high duration of growth phase and abbreviated phase of its reduction in Western part of the sea was emphasized. It is shown that variation of ice area reduction lasted from 1943 till 1995 indicates the slight impact of global warming on ice clearing process. But the following sharp reduction of ice area from 1995 till 2013 can be hypothetically referred to the beginning of man-caused impact on Arctic climate.Проведен анализ долговременных колебаний ледовитости моря Лаптевых за период 1940–2014 гг. Выделен крупномасштабный цикл в изменении аномалий ледовитости с высокой продолжительностью ветви его роста и сокращенной его нисходящей ветвью в западной части моря. Показано, что средняя площадь сокращения льдов в море, сохранявшаяся с 1943 по 1995 г., свидетельствует о слабом влиянии глобального потепления на процесс очищения моря ото льдов. Однако последовавшее резкое сокращение площади ледяного покрова в течение 1995–2013 гг. может быть гипотетически отнесено к началу антропогенного воздействия на климат Арктики
The yield of spring barley in the brown soils of the Nizhnee Povolzh'e region
No full textThe results of small (20-22 cm) and relatively deep main processing of the soil (27-30 cm) and variable rate application depth of arable horizon of doses of mineral nutrition (N and P2O5) on yield of spring barley. It is established that ploughing soil up to 30 cm (pillars of Cibima) with in-corporation at the same depth easy phosphorus-rhenium increases the biological activity of the soil microflora involved in the proposal of cellulose substrates is a means of increasing the fertility of light chestnut soil, which is especially important for rainfed conditions. The average crop capacity in the shallow plowing is 2 t/ha and was lower at 15% compared to Varian, where he held a deep subsurface tillage. By years of research sum-total biological activity in the deep subsurface treat-ment amounted to 930 mg of amino acids per gram of leaf, which is higher by 26% the variant with shallow plowing. Compared to shallow ploughing (option 1) at subsurface relatively deep processing of crude soil (option 2) there is greater accumulation of productive moisture in a meter layer. In the period of tillering of plants at average moisture reserves in option 2 is higher by 16% than in option 1 and constitute a 147 mm. In phase trubavina-earing and full maturity of the spring-barley the difference between the productive moisture content increases to between 20 and 33% in the direction of no-till deep processing. Relatively high soil moisture (a consequence of the method of tillage) contributed to a more rapid transition of phosphates in the horizon of 25-30 cm and nitrate in the layer 10-15 cm in available forms of nutrients for soil microorganisms. It is revealed that the application rate of nitrogen and phosphorus should be linked with the main processing of the soil, and the peculiarities of development of the root system of cultivated crops
A solution to the spatial tribocontact problem of the wear of a tooth gear using electric simulation
No full textMechanism of PhosphorusCarbon Bond Formation in the Amidoalkylation of Phosphonous Carboxylic Acids
No full textAn efficient one-pot synthesis of bis(α-aminoalkyl)phosphinic acids, phosphorus-isosteric analogues of HIV protease inhibitors
No full textРоль гидрометеорологических факторов и солнечной активности в межгодовых изменениях площади льдов Восточно-Сибирского моря
Get PDFInterannual changes of the summer ice coverage were investigated, and the role of hydrometeorological factors and solar activity in long-period fluctuations of the ice area in the East Siberian Sea was determined. Multivariate statistical analysis of time series of the ice cover, hydrometeorological elements, and the solar activity (SA), was performed for the period from 1950 to 2012 with regard for the cross-correlations of the analyzed variables that made possible to develop the equations of interannual fluctuations of the ice coverage in the East Siberian Sea in August and September. The equations include the following variables: air temperature in June–August of the current year TVI‑VIII; the atmospheric circulation presented by indices of Arctic oscillation (Arctic Oscillation, AO), Arctic dipole (Arctic Dipole, AD), Pacific North American oscillation (Pacific North American Oscillation, PNA); average annual runoff of river waters into the Laptev and East Siberian seas (RivLES) with a time shift of one and two years; average annual index of the North Atlantic thermal state (AMO) with a time lag of eight years; solar activity SA, presented by the average annual Wolf number with advancing of one year. Diagnostic calculations of the ice area by the obtained equations using the actual values of the indices did show a good agreement between the actual and calculated values in August and September from 1950 to 2012. These equations were used to calculate contribution of each factor to the general dispersion of fluctuations of the ice coverage. The most important factors influencing the ice cover of the Sea in August and September are: the air temperature; the atmospheric circulation, presented by the Arctic Oscillation at the end of winter; and Atlantic waters which are characterized by AMO with a time lag of eight years. The role of other factors, i.e. summer atmospheric circulation, river runoff into the above seas, and 11-year cycle of solar activity were found to be equal to only 5–10% for each. Basing on these estimates, it has been concluded that the obtained statistical equations may be used as the diagnostic models of interannual changes in the ice coverage.Получены статистические уравнения межгодовых колебаний площади льдов Восточно-Сибирского моря в августе и сентябре. Рассчитан вклад каждого фактора в общую дисперсию колебаний ледовитости. К преобладающим факторам, влияющим на площадь льдов в эти месяцы, относятся: температура воздуха; Арктическое колебание в конце зимы; индекс теплового состояния Северной Атлантики. Вклад в общую дисперсию режима летней атмосферной циркуляции, речного стока, расхода вод через Берингов пролив и солнечной активности находится в пределах 5–10% для каждого фактора.
