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Climate and Soil Temperature Variation in the Forest-Tundra Transition near Nadym, West Siberia, Russiaтезисы доклада
- Авторы: Goncharova O., Matyshak G., Bobrik A.
- Сборник: The Arctic Science Summit Week 2017, 31 March-7 April 2017, Prague, Czech Republic, Clarion Congress Hotel "A Dynamic Arctic in Global Change" Book of Abstracts
- Тезисы
- Год издания: 2017
- Место издания: CZECH-IN Prague, Czech Republic
- Первая страница: 139
- Последняя страница: 139
- Аннотация: The soil temperature regime is a significant integral indicator of the functioning as soils individual and the landscape as whole. In the changing climate is obvious necessity of detailed study of the soil and permafrost temperature, especially in the transitional areas, areas with unstable permafrost conditions. Four-year monitoring of soil temperature regime in three typical landscapes of northern taiga of West Siberia, Russia, located in the discontinuous permafrost zone was carried out. Based on average annual parameters, the soils function in different temperature regimes. For palsas soils (Histoturbels and Hemistels) annual temperature regime is Subgelic (the mean soil annual temperature above -4°C, permafrost). Temperature regime of forest soils (Haplocryods) is Cryic (the mean soil annual temperature is more than 0°C, but less than 8°C, no permafrost). The soils of the study area are functioning in a narrow range of temperatures: at a depth of 20 cm for soil of all landscapes more than half of the soil temperatures are ranged from -2,5°C to 0°C, due to their high moisture, low thermal conductivity, snow cover regime and the cooling effect of near-lying permafrost. Annual soil temperature parameters correlate weakly with the average thermal air conditions. A direct correlation of the annual soils temperature regime with snow cover dynamics (average and maximum depth, melting date), with a winter N-factor (thermal index of the surface) and sum of positive temperatures has been identified. Because the insulating effect of vegetation is significantly lower than snow (Summer N-factors - 0.7-0.9; winter N-factors - 0.11-0.32), summer air temperatures interannual fluctuations will significantly affect the soil temperature regime and the whole permafrost conditions in region.
- Добавил в систему: Гончарова Ольга Юрьевна