Sudden appearance of katabatic wind in Central-Eastern Europe driven by Scandinavian Ice Sheet dynamics as recorded in Polish loess

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL Global and Planetary Change Pub Date : 2025-01-21 DOI:10.1016/j.gloplacha.2025.104709

Jerzy Nawrocki, Przemysław Mroczek, Maria Łanczont, Karol Standzikowski

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Abstract

This study investigates atmospheric circulation changes in Central-Eastern Europe during the Last Glacial Maximum (LGM), with a particular focus on the anisotropy of magnetic susceptibility (AMS) of loess deposits from the Jarosław section in Southeastern Poland. The subject of the study was the sequence of L1LL1 loess, which reaches a depth of approximately 7.5 m. This research integrates new AMS data with optically stimulated luminescence (OSL) dating, granulometric analysis, and spectrophotometric measurements to elucidate the influence of abrupt northern katabatic winds that emerged around 22.7 ka. The appearance of katabatic northern winds in the Scandinavian Ice Sheet's southern foreland correlates well with the time when it covered its maximum area. This change of wind was recorded as a rapid phenomenon without any intercardinal wind directions. Significant shifts in wind patterns corresponded with the major climatic events of the LGM and the end of Heinrich Event 2 (H2). The study documents a pronounced correlation between AMS data and granulometric parameters, indicating dynamic responses of loess deposition to changing wind strengths and directions. The results underscore the sensitivity of the region's paleoclimate to global atmospheric patterns and contribute to the broader understanding of Pleistocene climatic dynamics and their impact on sedimentary processes.

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.