Abstract
The forests of the permafrost zone of Central Siberia are influenced by natural and anthropogenic factors. Using remote sensing data, disturbed areas of forest cover are detected in the IR range as an anomalies of the surface temperature, which are significant for a long time (~20 years). Long-term changes in the temperature balance of the surface affect both the state of the lower soil horizons and the dynamics of the seasonally thawed layer, and, therefore, can affect the variation in the water balance and groundwater runoff. For the area of interest, a trend is shown of ~20% increase in the total area of disturbances per last two decades. A correlation analysis between large-scale thermal anomalies of the underlying surface and the series of gravimetric data on Equivalent Water Height (EWH) parameter is performed for the territory of the two river basins of the Nizhnyaya Tunguska and Podkamennaya Tunguska (Central Siberia). As a first approximation we estimated the relationship between the forest and on-ground cover disturbance and thermal anomalies of the underlying surface, which affect the seasonal dynamics of groundwater.
Highlights
The forests of Central Siberia are subject to the complex impact of various anthropogenic, technogenic and natural factors
In order to verify this statement, we used a product of the GRACE satellite system, which provides gravimetric information expressed in terms of the equivalent water height (EWH)
Based on the analysis of the values of the underlying surface temperature, it was found that from 2001 to 2009 the total area of disturbances increased by 7.77% or 36752.1 km2 within the basin of the Nizhnyaya Tunguska river
Summary
The forests of Central Siberia are subject to the complex impact of various anthropogenic, technogenic and natural factors. It was found that forest areas affected by various destructive factors, due to changes in spectral characteristics in a wide range of the spectrum, are confidently detected in the thermal IR range in the format of thermal anomalies of the underlying surface from satellites [2–4]. Such anomalies, as it was shown in a number of recent papers [5, 6], can cause changes in the stability of ecosystems in the region. In order to verify this statement, we used a product of the GRACE satellite system, which provides gravimetric information expressed in terms of the equivalent water height (EWH)
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