Continental-Hemispheric Scale Dust Events Driven by Last Glacial Alpine Ice Sheet Dynamics

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-06-30 DOI:10.1029/2025GL115382

Yunus Baykal, Gábor Újvári, Thomas Stevens, Sergio Andò, Adriano Banak, Sanja Šuica, Marta Barbarano, Eduardo Garzanti

{"title":"Continental-Hemispheric Scale Dust Events Driven by Last Glacial Alpine Ice Sheet Dynamics","authors":"Yunus Baykal, Gábor Újvári, Thomas Stevens, Sergio Andò, Adriano Banak, Sanja Šuica, Marta Barbarano, Eduardo Garzanti","doi":"10.1029/2025GL115382","DOIUrl":null,"url":null,"abstract":"<p>Greenland ice cores demonstrate that transient last glacial cold climate events (stadials) were associated with greatly enhanced atmospheric dust loading. Detailed radiocarbon dating of loess in central Europe reveals concurrent increases in dust activity in dust-emitting regions. However, the causes of these changes in dust emission and the role of dust in rapid climate change remain unclear. We address this uncertainty through multi-proxy analysis of loess sources in Hungary. Our results demonstrate that loess particles were dominantly produced by subglacial grinding processes in the eastern Alps. These particles were released along with stadial Alpine Ice Sheet-driven meltwater pulses, turning major river systems into efficient dust sources for loess deposition in Europe. Concurrent strengthened anticyclonic circulation over northern Europe would have caused wider dispersal of Alpine Ice Sheet-derived dust as far as Greenland. Resultant continental-hemispheric scale changes in atmospheric dust loading likely amplified concomitant North Atlantic climate cooling and ice sheet decay during Greenland stadials.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115382","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geophysical Research Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2025GL115382","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Greenland ice cores demonstrate that transient last glacial cold climate events (stadials) were associated with greatly enhanced atmospheric dust loading. Detailed radiocarbon dating of loess in central Europe reveals concurrent increases in dust activity in dust-emitting regions. However, the causes of these changes in dust emission and the role of dust in rapid climate change remain unclear. We address this uncertainty through multi-proxy analysis of loess sources in Hungary. Our results demonstrate that loess particles were dominantly produced by subglacial grinding processes in the eastern Alps. These particles were released along with stadial Alpine Ice Sheet-driven meltwater pulses, turning major river systems into efficient dust sources for loess deposition in Europe. Concurrent strengthened anticyclonic circulation over northern Europe would have caused wider dispersal of Alpine Ice Sheet-derived dust as far as Greenland. Resultant continental-hemispheric scale changes in atmospheric dust loading likely amplified concomitant North Atlantic climate cooling and ice sheet decay during Greenland stadials.

Abstract Image

查看原文本刊更多论文

末次冰期高山冰盖动力学驱动的大陆-半球尺度沙尘事件

格陵兰冰芯表明，短暂的末次冰期冷气候事件与大气粉尘负荷的显著增加有关。中欧黄土的详细放射性碳定年揭示了粉尘排放区域的粉尘活动同时增加。然而，这些沙尘排放变化的原因以及沙尘在快速气候变化中的作用尚不清楚。我们通过对匈牙利黄土来源的多代理分析来解决这种不确定性。结果表明，东阿尔卑斯地区的黄土颗粒主要由冰下磨粒作用产生。这些颗粒与阿尔卑斯冰原驱动的融水脉冲一起释放，将主要河流系统变成了欧洲黄土沉积的有效粉尘来源。北欧上空同时加强的反气旋环流可能导致阿尔卑斯冰原产生的灰尘更广泛地扩散到格陵兰岛。由此产生的大陆-半球尺度大气沙尘负荷的变化可能在格陵兰冰期放大了随之而来的北大西洋气候变冷和冰盖衰减。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.