Preprints
https://doi.org/10.5194/egusphere-2024-544
https://doi.org/10.5194/egusphere-2024-544
27 Feb 2024
 | 27 Feb 2024
Status: this preprint is open for discussion and under review for Climate of the Past (CP).

Simulation of a former ice field with PISM – Snežnik study case

Matjaž Depolli, Manja Žebre, Uroš Stepišnik, and Gregor Kosec

Abstract. In this paper we present a reconstruction of climate conditions during the Last Glacial Maximum on a karst plateau in Dinaric Mountains (southern Slovenia) that bares evidence of glaciation. The reconstruction merges geomorphological ice limits, classified as either clear or unclear, and computer modelling approach based on Parallel Ice Sheet Model, which is an established numerical model for simulating glacier dynamics ranging from ice sheets to alpine glaciers. Based on extensive numerical experiments, where we studied the agreements between simulated and geomorphological ice extent, we propose to use a combination of high resolution precipitation model that accounts for orographic precipitation combined with simple elevation based temperature model. The geomorphological ice extent can be simulated with climate around 6 °C colder than modern and with a lower than modern amount of precipitation, which matches other state-of-the art climate reconstructions for the era. The results indicate that orographic precipitation model is essential for accurate simulation of the Snežnik with moist southern winds from the nearby Adriatic Sea having predominant effect on the precipitation patterns. Finally, this study shows that transforming climate conditions towards wetter and warmer or drier and colder does not significantly change conditions for glacier formation.

Matjaž Depolli, Manja Žebre, Uroš Stepišnik, and Gregor Kosec

Status: open (until 23 Apr 2024)

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  • RC1: 'Comment on egusphere-2024-544', Anonymous Referee #1, 05 Apr 2024 reply
  • RC2: 'Comment on egusphere-2024-544', Ethan Lee, 10 Apr 2024 reply
    • RC3: 'Commented PDF', Ethan Lee, 10 Apr 2024 reply
Matjaž Depolli, Manja Žebre, Uroš Stepišnik, and Gregor Kosec
Matjaž Depolli, Manja Žebre, Uroš Stepišnik, and Gregor Kosec

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Short summary
Locally financed project aims at studying former mountain glaciers at the Alps-Dinarides junction. Within it, a study was conducted about a currently ice-free plateau that bears evidence of past glaciation. The study combines geomorphological estimates of the ice field extent with computer simulations of the ice field. Although the shape of past ice field cannot be reconstructed exactly, the computer reconstruction helps us identify past climatic conditions that enabled the ice field growth.