The Inventory of Retrogressive Thaw Slumps (Thermocirques) in the North of West Siberia Based on 2016-2018 Satellite Imagery Mosaic

Nesterova, N.; Khomutov, Artem; Leibman, Marina; Safonov, Taras A.; Belova, Nataliya

doi:10.15372/kz20210604

Cited by 7 publications

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“…x FOR PEER REVIEW 4 of 16 The location of each TC mapped in West Siberia as of 2016-2018 [14] was used for Field data were collected at the research station Vaskiny Dachi in Central Yamal [13] at an area of about 100 km 2 .…”

Section: Study Area and Methodsmentioning

confidence: 99%

“…The location of each TC mapped in West Siberia as of 2016-2018 [14] was used for digitizing polygons of TCs on Sentinel-2A and Sentile-2B satellite images of 2021. The dataset contains 484 point objects of active and recently active (stabilized) TCs clearly identified visually.…”

Section: Manual Digitization Of Tc Polygonsmentioning

confidence: 99%

“…Therefore, there still is no understanding of the scale of active TC formation, the range of their dimensions, topographic characteristics, and the rate of ongoing changes for the whole area of West Siberia. In our previous work, the first TC inventory in West Siberia was created and arranged in a dataset of 439 objects [14]. Information concerning TC orientation was manually collected using visual indicators based on the free satellite imagery collection of Yandex.Maps and were statistically processed [14].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, the first TC inventory in West Siberia was created and arranged in a dataset of 439 objects [14]. Information concerning TC orientation was manually collected using visual indicators based on the free satellite imagery collection of Yandex.Maps and were statistically processed [14]. Additional 45 TCs were added to the dataset and jointly analyzed in this study.…”

Section: Introductionmentioning

confidence: 99%

“…In this research, we have used TC locations from the expanded dataset from [14] to measure the current areas of each TC based on Sentinel-2/2021 satellite images [15]. We have also used ArcticDEM [16] to determine additional spatial parameters of TCs included in this dataset, such as TC edge elevation and TC-bearing slope angle.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and Morphometry of Thermocirques in the North of West Siberia, Russia

2023

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The Arctic zone of West Siberia (Yamal and Gydan peninsulas) is an area with continuous permafrost and tabular ground ice close to the surface, active thermodenudation, and related landforms: retrogressive thaw slumps (RTS); in Russian referred to as thermocirques (TC). The dimensions of most TCs have not been determined so far. We use Sentinel 2 imagery to measure each TC area ranging from 0.55 to 38 ha with a median of 2.5 ha. Around 95% of TCs have an area of less than 10 ha. The largest areas are gained due to the merging of several neighboring TCs. The ArcticDEM is used to determine TC edge elevation and slope angle. In general, the Median TC of the Yamal peninsula has an area of 1.8 ha, an elevation of the edge of 17.7 m, and a slope angle of 2.5°. The Median TC of the Gydan peninsula has an area of 2.6 ha, elevation of the edge of 29.4 m, and slope angle of 3°. TCs of the Gydan peninsula occupy higher positions and slightly steeper slopes compared to TCs of the Yamal peninsula. The ranges of the median and the largest TC areas are consistent with the reported RTS dimensions in North America.

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Section: Study Area and Methodsmentioning

confidence: 99%

Section: Manual Digitization Of Tc Polygonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution and Morphometry of Thermocirques in the North of West Siberia, Russia

2023

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The study was funded by the Russian Science Foundation, project number 22-27-00644.

Leibman,

Kizyakov,

Nesterova

et al. 2023

Problemy Arktiki i Antarktiki

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A classification of cryogenic-landslide landforms is developed for mapping their distribution and dynamics. It is based on the previously suggested classification subdividing cryogenic landsliding into two main types: cryogenic translational landslides (or active-layer detachment slides), and cryogenic earth flows (or retrogressive thaw slumps). The increased proportion of retrogressive thaw slumps compared to active layer detachments in the North of West Siberia in the last decade creates the need for an expanded classification of cryogenic earth flows. One of the important issues is separating the process of landsliding and resulting landforms, which in English are covered by one term ‘retrogressive thaw slump’. In dealing with the landforms, we distinguish (1) open and (2) closed ones. Open cryogenic-landslide landforms are those formed by the retreating of the coast bluff due to the thaw of ice or ice-rich deposits with an additional impact from wave or stream action. Closed cryogenic-landslide landforms are those initiated on a slope landward, and thawed material is delivered to the coast or stream through an erosional channel. Morphologically we distinguish thermocirques and thermoterraces depending on the shape of the retreating headwall, crescent or linear, respectively. An important issue is the type of ground ice subjected to thaw: tabular, ice-wedge or constitutional ground ice are distinguished. Landforms can be active, stabilized or ancient. One can find both single landforms and their combination. The classification is based on a significant amount of field studies and interpretation of remote sensing data. Mapping of the cryogenic-landslide landforms is suggested using the proposed classification and indication features. The classification is based on the experience obtained mainly in the north of West Siberia. Applying it to other regions may require additional studies.

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Factors of thermal denudation activation and thermicirques activity on central Yamal in 2010–2018

Khomutov,

Babkina,

Khairullin

et al. 2024

Problemy Arktiki i Antarktiki

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The paper presents research findings of the climatic factors responsible for the activation of thermal denudation processes leading to the formation of thermocirques in the central part of the Yamal Peninsula in the north of West Siberia. Based on a comparison of multi-temporal remote sensing (2010, 2013 and 2018) coupled with climate data, an analysis of the thermocirques activity in 2010–2018 was carried out. Thermocirques are specific topographic forms that arise because of the activation of cryogenic earth flows, the formation of which is caused by an increased seasonal thawing of the upper part of the ground ice on the slopes as compared to the previous years. Analysis of the monitoring data showed that in 2012 and 2013 all the types of surfaces are characterized by a significant increase in seasonal thawing compared to the previous period 1993–2011 (12 % increase on slopes), due to the summer air temperature, the amount of summer precipitation and the increased duration of the warm period. The results of the thermocirques activity analysis are shown on a map. The results of this local study were compared with those of a regional (Yamal and Gydan Peninsulas) remote sensing study of thermocirques. This showed a higher accuracy of the local study based on field monitoring and very-high-resolution satellite imagery. The analysis of the thermocirques activity showed that 1) over the period from 2010 to 2018 thermal denudation activity in the study area increased due to the anomalous climatic conditions in the spring-summer season of 2012, and then gradually decreased; 2) in addition to “classical” thermocirques, which were at different stages of activity in the time periods analyzed (2010, 2013 and 2018), a significant number of embryonic thermocirques were identified. Such thermocirques, just as the majority of small “classical” thermocirques, can only be identified on very-high-resolution satellite imagery.

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The Inventory of Retrogressive Thaw Slumps (Thermocirques) in the North of West Siberia Based on 2016-2018 Satellite Imagery Mosaic

Cited by 7 publications

References 0 publications

Distribution and Morphometry of Thermocirques in the North of West Siberia, Russia

Distribution and Morphometry of Thermocirques in the North of West Siberia, Russia

The study was funded by the Russian Science Foundation, project number 22-27-00644.

Factors of thermal denudation activation and thermicirques activity on central Yamal in 2010–2018

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