Spatio-temporal dynamics evapotranspirationin the Podkamennaya Tunguska river basin
T. A. BURENINA1, I. V. DANILOVA1,2, N. A. MIKHEYEVA1
1Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia
Keywords: Podkamennaya Tunguska, forest ecosystems, forest-hydrological complexes, evapotranspiration
Abstract
Based on the landscape differentiation of the territory, an assessment of the hydrological role of the forest communities dominating in the Podkamennaya Tunguska basin in terms of their contribution to the total evaporation in the watershed was made. Evapotranspiration indicators, obtained from the Earth remote sensing data from the MODIS Global Evapotranspiration Project (MOD16 ET), which take into account the climatic characteristics of the study area, the types of terrestrial surface, and the diversity of vegetation cover were used. Studies have shown that the evapotranspiration of the identified classes of forest vegetation is characterized by significant variability both in space and in time. The variability of evapotranspiration over the years is primarily related to the variability of meteorological elements and the value of the leaf area index. In the spatial aspect, the variability of evaporation is determined by the general climatic characteristics of the study area and the forest species composition. As a result of data analysis, a reduction trend in annual evapotranspiration in the Podkamennaya Tunguska basin from 2000 to 2014 was revealed. A comparative analysis of evapotranspiration trends with temperature and precipitation trends confirms that the reduction trend in evapotranspiration is due to Climate change in region. It was found that the landscape structure of watersheds can be used to indicate the processes that form evapotranspiration as an important component of the water balance, and to determine the hydrologically significative boundaries of landscapes. An estimation of land surface evaporation from Earth remote sensing data (MOD16 ET product) can be used in water balance calculations in watersheds of various scales, especially in the absence of a runoff database.
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