Abstract
Thermodenudation on the Kara seacoast, the Yugorsky Peninsula, Russia, is studied by analyzing remote-sensing data. Landforms resulting from the thaw of tabular ground ice, referred to as thermocirques, are formed due to polycyclic retrogressive thaw slumps, during the last decade 2010–2020. We calculate the retreat rate of the thermocirque edge using various statistical approaches. We compared thermocirque outlines by the end of each time interval defined by the dates of available very-high-resolution imagery. Six thermocirques within two key sites on the Yugorsky peninsula are monitored. We correlate each of the thermocirque edge’s retreat rates to various climatic parameters obtained at the Amderma weather station to understand the interrelation patterns better. As a result, we find a very low correlation between the retreat rate of each thermocirque and summer warmth, rainfall, and wave action. In general, the activity of thermodenudation decreases in time from the previous decade (2001–2010) to 2010–2020, and from 2010 towards 2020, although the summer warmth trend increases dramatically. A single thermocirque or series of thermocirques expand in response to environmental and geological factors in coastal retreat caused by thermodenudation.
Highlights
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To improve the accuracy of orthorectification orthorectification and and imagery imagery spatial spatial alignment alignment in in areas areas with with significant changes in in of significant changes surface height, we propose a methodology of surface height, we propose a methodology of digital elevation model (DEM) reconstruction
We calculated the dynamics of TC edges with sub-meter accuracy even without support by land-based surveys
Summary
Slope failures in the continuous permafrost zone are tightly linked to ground ice distribution, especially to the melting of massive ground ice bodies [1,2,3,4,5,6,7]. Several climate extremes were noted in the Arctic [8]. They attracted interest to the response of permafrost with massive ground ice to high summer warmth episodes with both positive (higher retreat rates) [9,10,11,12,13,14,15] and negative (lower retreat rates) [16] responses. Snow accumulation accelerates nivation and thermoerosion [2,10] and controls ground temperature rise [19,20]
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