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Late Quaternary glacial history of the Altyn Tagh Range, northern Tibetan Plateau
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2021-07-07 , DOI: 10.1016/j.palaeo.2021.110561
Guocheng Dong 1, 2, 3 , Chaolu Yi 4, 5 , Weijian Zhou 1, 2, 3 , Xiangke Xu 4, 5 , Yunchong Fu 1, 2, 3
Affiliation  

Quantifying the timing and extent of late Quaternary glaciations across the Tibetan Plateau (TP) is critical to understanding regional and global climate changes. Despite significant advancements in our knowledge of glacial histories of the TP over the past several decades, chronological constraints are still lacking for the high glaciated mountain ranges on the northern TP, including the Altyn Tagh Range. In this study, we provide thirty-two new 10Be exposure-ages to construct a late Quaternary glacial history of the Altyn Tagh Range at the Altyn “Pass” and Akato Tagh. The dating results from Altyn “Pass” indicate that glacier might have fully melted out of this area after Marine Isotope Stage 3 (MIS 3). The tentatively-defined minimum moraine ages north of Akato Tagh show that four glacial culminations possibly occurred during MIS 5, MIS 4, MIS 3 or 2, and the late Holocene. These dating results, together with the compiled exposure-ages from Sulamu Tagh, imply that the last glacial glacier fluctuations along the Altyn Tagh Range were likely driven by several factors: North Atlantic climate oscillations, northern hemispheric high-latitude summer solar insolation, atmospheric CO2 concentrations, and geometry of glacier catchment. The progressive reduction in glacier extent during the last glacial is likely associated with available precipitation, controlled by the mid-latitude westerlies.



中文翻译:

青藏高原北部阿尔金山脉晚第四纪冰川史

量化青藏高原(TP)晚第四纪冰川作用的时间和范围对于了解区域和全球气候变化至关重要。尽管过去几十年我们对青藏高原冰川历史的了解取得了重大进展,但青藏高原北部的高冰川山脉(包括阿尔金山脉)仍然缺乏时间限制。在这项研究中,我们提供了 32 个新的10在阿尔金“山口”和阿卡托塔格构建阿尔金山脉晚第四纪冰川历史。Altyn“Pass”的测年结果表明,在海洋同位素第 3 阶段 (MIS 3) 之后,该地区的冰川可能已经完全融化。Akato Tagh 以北暂定的最小冰碛年龄表明,在 MIS 5、MIS 4、MIS 3 或 2 以及晚全新世期间可能发生了四个冰期顶点。这些测年结果,连同来自苏拉穆塔格的汇编暴露年龄,意味着阿尔金山脉的最后一次冰川波动可能是由几个因素驱动的:北大西洋气候振荡、北半球高纬度夏季太阳日照、大气二氧化碳2冰川集水区的浓度和几何形状。最后一次冰川期间冰川范围的逐渐减少可能与可用降水有关,受中纬度西风带的控制。

更新日期:2021-07-14
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