Die Kleinformen der Frostmusterböden : Vergleich Arktis - Alpen - Tropisches Hochgebirge

Freund, R.

doi:10.5194/gh-26-142-1971

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The length of the sorted polygons was excluded from the ANOVA analyses because this parameter can relate to the surface inclination and thus it can reflect other factors, such as solifluction 50 . The width of the polygons was used to estimate the thickness of the past active layer based on the regression equation (Figure 4) for a set of published paired data 4,5,9,51–67 …”

Section: Methodsmentioning

confidence: 99%

“…Width of sorted patterned ground used to estimate the active‐layer thickness. Black crosses, solid lines, and dashed black lines indicate, respectively, the data (from references 5 and 51–66), linear fit, and 95% confidence intervals for active forms. Relict sorted polygons and circles (gray symbols; data from references 4, 9, 63, and 67) reveal a very similar relationship between width and sorting depth, confirming that these features indicate the active layer…”

Section: Methodsmentioning

confidence: 99%

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¹⁰Be exposure age for sorted polygons in the Sudetes Mountains

Engel

Křížek

Braucher

et al. 2020

Permafrost & Periglacial

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Patterned ground landforms represent the most common phenomenon of periglacial environment and its large sorted forms belong to the few morphological indicators of former permafrost distribution. Relic forms of patterned ground are widespread on high-elevated surfaces in the central European uplands, providing the evidence of regional periglacial conditions in the past. However, the timing of these landforms as well as their potential for paleoclimate reconstructions, have remained unexplored. In this paper, we present 10 Be exposure ages from the large sorted polygons sampled at four sites in the Sudetes Mountains, the highest part of the central European uplands. These results indicate that these landforms started to form at the end of MIS 3 and the main phase of their formation occurred between 30 and 20 ka. This research confirms the hypothesis of patterned ground formation within the Weichselian glacial (115ka-10ka ?) and suggests that earlier landforms are not preserved in the Sudetes. The recognised period of enhanced periglacial activity coincides with a prominent cold interval identified earlier in both regional and northern-hemispheric proxy records.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

¹⁰Be exposure age for sorted polygons in the Sudetes Mountains

Engel

Křížek

Braucher

et al. 2020

Permafrost & Periglacial

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Effect of Climate on Morphology and Development of Sorted Circles and Polygons

Uxa

Mida

Křížek

2017

Permafrost & Periglacial

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Sorted circles and polygons are widespread features of periglacial landscapes, but the controls on their development remain poorly understood, impeding their use as palaeoenvironmental indicators. We investigate the relationship of sorted circles and polygons to altitude in the northern Billefjorden area, central Svalbard. The patterns occur in two distinct elevation zones, below 200–250 m asl and above 600 m asl. The higher‐elevated patterns have smaller diameters and shallower sorting depths due to a thinner active layer at higher elevations, suggesting that sorted patterns can indicate climate conditions and ground thermal state when the patterns initiated. Geology is believed to be of less importance for pattern morphology in the study area, causing only its fine‐scale variations. The pattern diameter‐to‐sorting depth ratios have a median value of 3.57, consistent with previous studies and theoretical models of patterned‐ground formation involving circulation mechanisms. Large‐scale sorted patterns may develop over centennial timescales in this high‐Arctic environment. They are probably not in equilibrium with present‐day climate conditions and have probably formed throughout the Holocene. Copyright © 2017 John Wiley & Sons, Ltd.

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