Active Layer Warming and Thickening on CALM-S JGM, James Ross Island, in the Period 2013/14-2022/23

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Publikace nespadá pod Ústav výpočetní techniky, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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HRBÁČEK Filip KŇAŽKOVÁ Michaela LÁSKA Kamil KAPLAN PASTÍRIKOVÁ Lucia

Rok publikování 2025
Druh Článek v odborném periodiku
Časopis / Zdroj Permafrost and Periglacial Processes
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://onlinelibrary.wiley.com/doi/10.1002/ppp.2274
Doi https://doi.org/10.1002/ppp.2274
Klíčová slova GROUND SURFACE-TEMPERATURE; LIVINGSTON ISLAND; BYERS PENINSULA; TEMPORAL VARIABILITY; ANTARCTIC PENINSULA; SNOW COVER; THAW DEPTH; LAKE; SITE
Přiložené soubory
Popis The Circumpolar Active Layer Monitoring-South (CALM-S) site was established near the Johann Gregor Mendel (JGM) research station on James Ross Island in February 2014. The CALM-S JGM grid, measuring 80?×?70?m, encompasses two distinct lithological units: a Holocene marine terrace (covering approximately 75% of the grid) and Cretaceous sediments of the Whisky Bay Formation (covering the remaining 25%). Within each lithology, a monitoring profile was established to track the active layer thermal regime and thickness. Additionally, active layer thaw depth probing has been conducted annually around mid-February. Since 2017, the dataset has been further supplemented by surficial soil water content measurements. During the study period (2013/14–2022/23), air temperature increased at a rate of 0.2°C per year. Consequently, the active layer thickness, defined by the 0°C isotherm, increased by an average of 1.5?cm per year, while mechanically probed thaw depths showed an annual increase of 1.9?cm. This study confirms that local lithology strongly influences active layer thermal regime. On average, the active layer thickness was 24?cm greater on AWS-CALM (Cretaceous sediments) than on AWS-JGM (marine terrace). The thaw depth was 28?cm greater in the Cretaceous sediment part of CALM-S compared with the marine terrace part. A strong correlation (r?=?0.82 to r?=?0.91) was found between active layer thickness and thaw depth with thawing degree days of air and near-surface ground temperature in both lithologies.
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