Paleoglacier reconstructions in the northern and southern forelands of the European Alps indicate a synchronous Late Pleistocene glacial maximum during Marine Isotope Stage (MIS) 2, in phase with global ice volume records. However, strong controversy remains for the western foreland, where scarce and indirect dating as well as modeling studies suggest glacial maxima out of phase with the rest of the Alps. New luminescence dating brings the first direct Late Pleistocene glacial chronology for the western Alpine foreland and reveals two major glacier advances of similar maximum extent, at ca. 75–60 and ca. 40–30 ka, coinciding with MIS 4 and late MIS 3. We propose that asynchrony in glacial maxima between the western and the northern and southern Alpine forelands results from a progressive spatial reorganization of the atmospheric circulation over the North Atlantic in response to Northern Hemisphere ice-sheet fluctuations. While such a feedback mechanism has emerged from general circulation models, our Late Pleistocene paleoglacial reconstruction permits tracking of the spatiotemporal evolution of moisture advection patterns over Western Europe.

中文翻译：

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西阿尔卑斯山晚更新世冰川最大值反映北大西洋大气环流过去的变化

欧洲阿尔卑斯山北部和南部前陆的古冰川重建表明，在海洋同位素阶段 (MIS) 2 期间发生了同步的晚更新世冰川最大值，与全球冰量记录同步。然而，西部前陆仍然存在强烈争议，那里稀缺的间接测年以及建模研究表明冰川最大值与阿尔卑斯山的其余部分不同相。新的发光测年为阿尔卑斯山西部前陆带来了第一个直接的晚更新世冰川年代学，并揭示了两个最大程度相似的主要冰川进展，大约在 2000 年。75-60 和约。40-30 ka，与 MIS 4 和晚期 MIS 3 一致。我们提出，西部、北部和南部阿尔卑斯前陆之间冰川最大值的不同步是北大西洋大气环流对北半球冰盖波动做出反应而逐渐空间重组的结果。虽然这种反馈机制已经从一般环流模型中出现，但我们的晚更新世古冰期重建允许跟踪西欧水分对流模式的时空演变。