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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/gmd-2020-5
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-5
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 23 Jan 2020

Submitted as: model description paper | 23 Jan 2020

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This preprint is currently under review for the journal GMD.

PERICLIMv1.0: A model deriving palaeo-air temperatures from thaw depth in past permafrost regions

Tomáš Uxa1,2, Marek Křížek1, and Filip Hrbáček3 Tomáš Uxa et al.
  • 1Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Praha, Czech Republic
  • 2Department of Geothermics, Institute of Geophysics, Czech Academy of Sciences, Praha, Czech Republic
  • 3Department of Geography, Faculty of Science, Masaryk University, Brno, Czech Republic

Abstract. Periglacial features are among the most common relics of colder climates, which repetitively occurred throughout the Quaternary, and, as such, they are widespread archives of past conditions. Climatic controls on most periglacial features, however, remain poorly established, and thus empirical palaeo-climatic reconstructions based on them are far from reliable. This study introduces and evaluates a new simple inverse modelling scheme PERICLIMv1.0 (PERIglacial CLIMate) that aims to overcome these flaws through deriving the palaeo-air temperature characteristics coupled with the thickness of the palaeo-active layer, which can be recognized in many relict permafrost-related features. The evaluation against modern temperature records showed that the model reproduces air temperature characteristics, such as mean annual air temperature, mean air temperature of the warmest and coldest month and of the thawing and freezing season, with a mean error of ≤ 0.5 °C. Besides, air thawing and freezing indices both depart on average by 6 %, whereas the length of the thawing and freezing season tends to be on average underestimated and overestimated by 10 % and 4 %, respectively. The high model success rate is promising and suggests that it could become a powerful tool for reconstructing Quaternary palaeo-environments across vast areas of mid-latitudes where relict periglacial assemblages frequently occur, but their full potential remains to be exploited.

Tomáš Uxa et al.

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Tomáš Uxa et al.

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PERICLIMv1.0: A model deriving palaeo-air temperatures from thaw depth in past permafrost regions T. Uxa https://doi.org/10.5281/zenodo.3600271

Tomáš Uxa et al.

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Latest update: 23 Sep 2020
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Short summary
We introduce a simple modelling scheme PERICLIMv1.0 (PERIglacial CLIMate) that derives air temperature characteristics associated with former periglacial features indicative of the base of the palaeo-active layer. Its evaluation against modern temperature records showed a high success rate, which suggests that it could become a powerful tool for reconstructing Quaternary palaeo-environments where relict periglacial assemblages frequently occur, but their full potential remains to be exploited.
We introduce a simple modelling scheme PERICLIMv1.0 (PERIglacial CLIMate) that derives air...
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