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Heinrich Stadial aridity forced Mediterranean-wide glacier retreat in the last cold stage
Nature Geoscience ( IF 18.3 ) Pub Date : 2021-03-29 , DOI: 10.1038/s41561-021-00703-6
James L. Allard , Philip D. Hughes , Jamie C. Woodward

Throughout the last cold stage, the North Atlantic region was punctuated by abrupt climate shifts and atmospheric processes propagated their effects to adjacent continents. During Heinrich Stadials, the ocean was chilled by icebergs calved from the great ice sheets. The impact of multiple temperature and precipitation regime changes on Late Pleistocene mountain glaciers and landscape development is poorly understood. Here we analyse 1,118 cosmogenic exposure ages—spanning the last 100,000 years—from glacial landforms on three continents across the Mediterranean. We evaluate their geomorphological context and stratify the record by depositional setting and geographical region. The database includes 300 dated moraines. We show that, despite cold temperatures, Heinrich Stadial aridity caused negative glacier mass balance and repeatedly stalled glacier growth across the Mediterranean. In contrast, relatively warm and humid climates between Heinrich Stadials favoured positive glacier mass balance, resulting in region-wide glacier growth and moraine formation. Our analysis supports climate model simulations of repeated and widespread Heinrich Stadial aridity in the Mediterranean basin during the last cold stage. Heinrich Stadials also saw enhanced supply of coarse debris from valley sides. The cumulative geomorphological impact of these climate shifts saw the largest moraines form at the culmination of the glacial cycle.



中文翻译:

Heinrich Stadial 干旱迫使地中海冰川在最后一个寒冷阶段退缩

在最后一个寒冷阶段,北大西洋地区被突然的气候变化所打断,大气过程将其影响传播到邻近的大陆。在海因里希·斯塔迪亚斯期间,海洋被从大冰盖上裂开的冰山所冷却。多重温度和降水状况变化对晚更新世山地冰川和景观发展的影响知之甚少。在这里,我们分析了地中海三大洲冰川地貌的 1,118 个宇宙成因暴露年龄(跨越过去 10 万年)。我们评估它们的地貌背景,并按沉积环境和地理区域对记录进行分层。该数据库包括 300 个过时的冰碛。我们表明,尽管气温寒冷,Heinrich Stadial 干旱导致冰川质量负平衡,并一再阻止整个地中海的冰川增长。相比之下,海因里希·斯塔迪亚斯之间相对温暖和潮湿的气候有利于冰川质量正平衡,导致整个区域的冰川生长和冰碛形成。我们的分析支持气候模型模拟在最后一个寒冷阶段地中海盆地反复和广泛的 Heinrich Stadial 干旱。Heinrich Stadias 还发现来自山谷两侧的粗粒碎片供应增加。这些气候变化的累积地貌影响在冰川周期的顶点形成了最大的冰碛。导致整个区域的冰川生长和冰碛的形成。我们的分析支持气候模型模拟在最后一个寒冷阶段地中海盆地反复和广泛的 Heinrich Stadial 干旱。Heinrich Stadias 还发现来自山谷两侧的粗粒碎片供应增加。这些气候变化的累积地貌影响在冰川周期的顶点形成了最大的冰碛。导致整个区域的冰川生长和冰碛的形成。我们的分析支持气候模型模拟在最后一个寒冷阶段地中海盆地反复和广泛的 Heinrich Stadial 干旱。Heinrich Stadias 还发现来自山谷两侧的粗粒碎片供应增加。这些气候变化的累积地貌影响在冰川周期的顶点形成了最大的冰碛。

更新日期:2021-03-29
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