Simulation of a former ice field with Parallel Ice Sheet Model – Snežnik study case

IF 3.8 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Climate of The Past Pub Date : 2024-07-10 DOI:10.5194/cp-20-1471-2024

Matjaž Depolli, Manja Žebre, Uroš Stepišnik, Gregor Kosec

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Abstract

Abstract. In this paper, we present a reconstruction of climate conditions during the Last Glacial Maximum on a karst plateau Snežnik, which lies in Dinaric Mountains (southern Slovenia) and bears evidence of glaciation. The reconstruction merges geomorphological ice limits, classified as either clear or unclear, and a computer modelling approach based on the Parallel Ice Sheet Model (PISM). Based on extensive numerical experiments where we studied the agreements between simulated and geomorphological ice extent, we propose using a combination of a high-resolution precipitation model that accounts for orographic precipitation combined with a simple elevation-based temperature model. The geomorphological ice extent can be simulated with climate to be around 6 °C colder than the modern day and with a lower-than-modern-day amount of precipitation, which matches other state-of-the art climate reconstructions for the era. The results indicate that an orographic precipitation model is essential for the accurate simulation of the study area, with moist southern winds from the nearby Adriatic Sea having a 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 the conditions for glacier formation.

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利用平行冰原模型模拟前冰原--斯涅日尼克研究案例

摘要本文介绍了末次冰川极盛时期斯内兹尼克岩溶高原气候条件的重建，该高原位于迪纳拉山脉（斯洛文尼亚南部），有冰川作用的证据。重建工作融合了地貌冰界限（分为清晰和不清晰两种）和基于平行冰盖模型（PISM）的计算机建模方法。在广泛的数值实验中，我们研究了模拟冰层范围与地貌冰层范围之间的一致性，在此基础上，我们建议将考虑到地貌降水的高分辨率降水模型与基于海拔的简单温度模型结合起来使用。在模拟地貌冰范围时，气候比现代低约 6 ℃，降水量也比现代低，这与当时其他最先进的气候重建结果相吻合。研究结果表明，要准确模拟研究地区的降水情况，必须使用风向降水模型，来自附近亚得里亚海的潮湿南风对降水模式有主要影响。最后，这项研究表明，气候条件向更湿更暖或更干更冷的方向转变并不会显著改变冰川形成的条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Climate of The Past 地学-气象与大气科学

CiteScore

7.40

自引率

14.00%

发文量

120

审稿时长

4-8 weeks

期刊介绍： Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.