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Contemporary changes of geo-runoff components in the largest Russian arctic riversтезисы доклада
- Авторы: Georgiadi A., Kashutina Е., Milyukova I.
- Сборник: Practical Geography and XXI Century Challenges. International Geographical Union Thematic Conference dedicated to the Centennial of the Institute of Geography of the Russian Academy of Sciences, 4–6 June 2018, Moscow. Conference Book
- Редакторы: Иванов Сергей Владимирович, Себенцов Александр Борисович, Суслова Светлана Борисовна
- Том: 1
- Тезисы
- Год издания: 2018
- Издательство: Федеральное государственное бюджетное учреждение науки Институт географии Российской академии наук
- Местоположение издательства: Москва
- Первая страница: 81
- Последняя страница: 81
- Аннотация: Long-term phases of changes in naturalized components of the geo-runoff (streamflow, heat flow and suspended sediment yield) of Russian Arctic Rivers during the period of observation (from 1930-1940 till 2000s) were revealed on the basis of normalized cumulative curves. Their characteristics and the effects of impact of anthropogenic factors are evaluated. Since 1930-1940s till the beginning of the 21st century, the naturalized annual and seasonal river runoff in the largest river basins (Ob’, Yenisei, Lena) was characterized by two main long-term phases of its changes. The phase of decreased runoff (since the 1930-1940s) was replaced in the 1970-1980s by a long-term phase of increased streamflow. The duration of phases was several decades and are characterized by significant runoff differences. In the long-term variations of the heat flow of the Ob, Yenisei, Lena also were found two major long-term phases. The phase of the heat flow decrease, which began in 1930-1940-ies and lasted for 35-55 years, was replaced in 1970-1980 by 20-year phase of its increase (except the Yenisei, where this phase began in the late 1990s.) and has continued until now. Similar long-term phases are observed for river water temperature of considered rivers. Differences in heat flow reaches 20% during the phase of its increased and decreased values for the Yenisei Rivers, but for other rivers they are not higher than 10%. Long-term changes of annual suspended sediment yield for the Yenisei and Lena Rivers are also characterized by two major long-term phases, which replaced each another in the 1970- 1990. Differences in the suspended sediment yield during the increase and decrease phases reach 40% for Lena, whereas for Yenisei they are substantially less (10%). Anthropogenic factors (mainly water reservoirs) have significantly changed the characteristics of the long-term phases on the Yenisei River while their impact is not significant on other rivers. The long-term phases of decrease and increase of "conditionally natural" components of Arctic Rivers of Russia geo-runoff are closely associated with the indices of zonal atmospheric air transport intensity.
- Добавил в систему: Кашутина Екатерина Александровна