Late Quaternary glacial maxima in southern Patagonia: insights from the Lago Argentino glacier lobe

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Climate of The Past Pub Date : 2024-08-28 DOI:10.5194/cp-20-1861-2024
Matias Romero, Shanti B. Penprase, Maximillian S. Van Wyk de Vries, Andrew D. Wickert, Andrew G. Jones, Shaun A. Marcott, Jorge A. Strelin, Mateo A. Martini, Tammy M. Rittenour, Guido Brignone, Mark D. Shapley, Emi Ito, Kelly R. MacGregor, Marc W. Caffee
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Abstract

Abstract. Determining the timing and extent of Quaternary glaciations around the globe is critical to understanding the drivers behind climate change and glacier fluctuations. Evidence from the southern mid-latitudes indicates that local glacial maxima preceded the global Last Glacial Maximum (LGM), implying that feedbacks in the climate system or ice dynamics played a role beyond the underlying orbital forcings. To shed light on these processes, we investigated the glacial landforms shaped and deposited by the Lago Argentino glacier (50° S), an outlet lobe of the former Patagonian Ice Sheet, in southern Argentina. We mapped geomorphological features on the landscape and dated moraine boulders and outwash sediments using 10Be cosmogenic nuclides and feldspar infrared stimulated luminescence (IRSL) to constrain the chronology of glacial advance and retreat. We report that the Lago Argentino glacier lobe reached more extensive limits prior to the global LGM, advancing during the middle to late Pleistocene between 243–132 ka and during Marine Isotope Stage 3 (MIS 3), culminating at 44.5 ± 8.0 and at 36.6 ± 1.0 ka. Our results indicate that the most extensive advance of the last glacial cycle occurred during MIS 3, and we hypothesize that this was a result of longer and colder winters, as well as increased precipitation delivered by a latitudinal migration of the Southern Westerly Winds belt, highlighting the role of local and regional climate feedbacks in modulating ice mass changes in the southern mid-latitudes.
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巴塔哥尼亚南部第四纪晚期冰川最大值:阿根廷湖冰川叶的启示
摘要确定全球第四纪冰川的时间和范围对于了解气候变化和冰川波动背后的驱动因素至关重要。来自南半球中纬度地区的证据表明,当地冰川最大值出现在全球末次冰川最盛期(LGM)之前,这意味着气候系统或冰动力学的反馈作用超出了基本的轨道作用力。为了揭示这些过程,我们调查了阿根廷湖冰川(南纬 50°)塑造和沉积的冰川地貌,该冰川是阿根廷南部前巴塔哥尼亚冰原的一个出口裂片。我们绘制了地貌特征图,并利用 10Be 宇宙成因核素和长石红外激发发光(IRSL)测定了冰碛巨石和冲刷沉积物的年代,以确定冰川前进和后退的年代学。我们报告说,阿根廷湖冰川叶在全球大冰期之前达到了更大的范围,在 243-132 ka 之间的中更新世晚期和海洋同位素阶段 3(MIS 3)期间前进,在 44.5 ± 8.0 ka 和 36.6 ± 1.0 ka 达到顶峰。我们的研究结果表明,上一个冰川周期最大规模的前进发生在 MIS 3 期间,我们假设这是冬季更长、更冷以及南西风带纬度迁移带来的降水量增加的结果,突出了当地和区域气候反馈在调节南中纬度地区冰量变化中的作用。
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来源期刊
Climate of The Past
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.
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