Preprints
https://doi.org/10.5194/tc-2021-5
https://doi.org/10.5194/tc-2021-5

  04 Feb 2021

04 Feb 2021

Review status: this discussion paper is a preprint. It has been under review for the journal The Cryosphere (TC). The manuscript was not accepted for further review after discussion.

Effect of ephemeral snow cover on the active layer thermal regime and thickness on CALM-S JGM site, James Ross Island, eastern Antarctic Peninsula

Filip Hrbáček1, Zbyněk Engel2, Michaela Kňažková1, and Jana Smolíková1,2 Filip Hrbáček et al.
  • 1Department of Geography, Faculty of Science, Masaryk University, Brno, Czech Republic
  • 2Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Prague, Czech Republic

Abstract. This study aims to assess the role of ephemeral snow cover on ground thermal regime and active layer thickness in two ground temperature measurement profiles on the Circumpolar Active Layer Monitoring Network – South (CALM-S) JGM site on James Ross Island, eastern Antarctic Peninsula during the high austral summer 2018. The snowstorm of 13–14 January created a snowpack of recorded depth of up to 38 cm. The snowpack remained on the study site for 12 days in total and covered 46 % of its area six days after the snowfall. It directly affected ground thermal regime in a study profile AWS-JGM while the AWS-CALM profile was snow-free. The thermal insulation effect of snow cover led to a decrease of mean summer ground temperatures on AWS-JGM by ca 0.5–0.7 °C. Summer thawing degree days at a depth of 5 cm decreased by ca 10 % and active layer was ca 5–10 cm thinner when compared to previous snow-free summer seasons. Surveying by ground penetrating radar revealed a general active layer thinning of up to 20 % in those parts of the CALM-S which were covered by snow of > 20 cm depth for at least six days.

Filip Hrbáček et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-5', Anonymous Referee #1, 03 Mar 2021
  • RC2: 'Comment on tc-2021-5', Anonymous Referee #2, 12 Mar 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-5', Anonymous Referee #1, 03 Mar 2021
  • RC2: 'Comment on tc-2021-5', Anonymous Referee #2, 12 Mar 2021

Filip Hrbáček et al.

Filip Hrbáček et al.

Viewed

Total article views: 283 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
210 66 7 283 3 3
  • HTML: 210
  • PDF: 66
  • XML: 7
  • Total: 283
  • BibTeX: 3
  • EndNote: 3
Views and downloads (calculated since 04 Feb 2021)
Cumulative views and downloads (calculated since 04 Feb 2021)

Viewed (geographical distribution)

Total article views: 269 (including HTML, PDF, and XML) Thereof 269 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 19 Apr 2021
Download
Short summary
This manuscript assesses the effect of the ephemeral snow cover occurring during high summer on ground thermal regime and active layer thickness in the cold environment of James Ross Island on Antarctic Peninsula region. We found that even short-term occurrence of relatively thick snow (> 20 cm) can significantly affect ground thermal conditions and consequently reduce the active layer thaw depth by ca 10 % when compare to snow-free conditions.