Abstract The geologic record of mountain glaciation is one of the most sensitive archives of terrestrial climate change during the late Quaternary Period. Pleistocene glacial deposits are exceptionally well preserved in the Great Basin of North America where they are found in close proximity to shoreline deposits of coeval paleo-lakes, representing a unique opportunity to investigate paleoclimate change using both hydrologic systems. Mountain glaciers advanced across much of the Wasatch Range, Utah during the same general time interval when Lake Bonneville expanded in the adjacent Bonneville Basin. Here we present a range-wide Latest Pleistocene glacial history for the Wasatch Range based on 22 new and 41 recalculated cosmogenic 10Be surface exposure ages, and reconstruct glaciers and climate for the Last Glacial Maximum (LGM) and Lateglacial periods. Our results indicate three distinct, range-wide phases of glaciation in the Wasatch including the Pinedale 1 (ca. 21–20 ka), Pinedale 2 (ca. 17.5 ka) and Pinedale 3 (ca. 15 ka). Our modeling results indicate that the Pinedale 1 advance, near the end of the global LGM, was primarily driven by decreased annual temperatures with little to no change in precipitation as compared to modern. Wasatch glaciers appear to have reoccupied near maximum positions after the end of the LGM during the Pinedale 2, responding to increased precipitation in concert with rising lake levels across Western North America, and then retreated from ice-distal positions near ca. 17.5 ka. Wasatch glaciers occupied recessional positions at approximately half their maximum lengths during Pinedale 3 until ca. 15 ka, followed by rapid (i.e. several millennia) deglaciation. Our glacial chronologies establish that Wasatch glaciers responded synchronously across the range to global and regional climate forcings during the Latest Pleistocene. The new Wasatch glacial chronology, combined with global glacial chronologies and paleoclimate proxies from Western North America, suggest glacier change was driven by a combination of long-term global temperature forcing as well as regional to local modifications in precipitation.

中文翻译：

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犹他州瓦萨奇山脉的最新更新世冰川和气候历史

摘要 山地冰川地质记录是第四纪晚期陆地气候变化最敏感的档案之一。更新世冰川沉积物在北美大盆地保存得异常完好，在那里它们靠近同时代古湖泊的海岸线沉积物，这代表了使用两种水文系统研究古气候变化的独特机会。在与邦纳维尔湖在相邻的邦纳维尔盆地扩张的同一时间间隔内，山地冰川在犹他州瓦萨奇山脉的大部分地区前进。在这里，我们根据 22 个新的和 41 个重新计算的宇宙成因 10Be 表面暴露年龄，展示了瓦萨奇山脉的最新更新世冰川历史，并重建末次盛冰期 (LGM) 和晚冰期的冰川和气候。我们的结果表明，Wasatch 存在三个不同的、范围广泛的冰川作用阶段，包括 Pinedale 1（约 21-20 ka）、Pinedale 2（约 17.5 ka）和 Pinedale 3（约 15 ka）。我们的建模结果表明，在全球 LGM 接近尾声时，Pinedale 1 的推进主要是由年气温下降驱动的，与现代相比，降水几乎没有变化。在松树谷 2 期的 LGM 结束后，瓦萨奇冰川似乎重新占据了接近最大位置，以响应与北美西部湖泊水位上升一致的降水增加，然后从约 17.5 卡。Wasatch 冰川在 Pinedale 3 期间占据大约一半最大长度的衰退位置，直到大约。15 ka，随后是快速（即几千年）冰消期。我们的冰川年表确定瓦萨奇冰川在最新更新世期间对全球和区域气候强迫的范围内同步响应。新的瓦萨奇冰川年代学，结合全球冰川年代学和北美西部的古气候代表，表明冰川变化是由长期全球温度强迫以及区域到局部降水变化的组合驱动的。我们的冰川年表确定瓦萨奇冰川在最新更新世期间对全球和区域气候强迫的范围内同步响应。新的瓦萨奇冰川年代学，结合全球冰川年代学和北美西部的古气候代表，表明冰川变化是由长期全球温度强迫以及区域到局部降水变化的组合驱动的。我们的冰川年表确定瓦萨奇冰川在最新更新世期间对全球和区域气候强迫的范围内同步响应。新的瓦萨奇冰川年代学，结合全球冰川年代学和北美西部的古气候代表，表明冰川变化是由长期全球温度强迫以及区域到局部降水变化的组合驱动的。