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藏东南波堆藏布江流域古乡冰期冰川重建
引用本文:覃长雄,许刘兵,谢金明,周尚哲. 藏东南波堆藏布江流域古乡冰期冰川重建[J]. 冰川冻土, 2021, 43(3): 724-734. DOI: 10.7522/j.issn.1000-0240.2021.0014
作者姓名:覃长雄  许刘兵  谢金明  周尚哲
作者单位:1.华南师范大学 地理科学学院,广东 广州 510631;2.兰州大学 资源环境学院,甘肃 兰州 730000
基金项目:国家自然科学基金项目(41771065)
摘    要:"古乡冰期"是青藏高原第四纪冰川作用中最具代表性的冰期之一,指代的是倒数第二次冰期,其命名依据来源于藏东南波堆藏布江谷地、保存于古乡一带的终碛-侧碛垄,已有的宇宙成因核素10Be暴露测年结果显示其发生于海洋氧同位素阶段(MIS)6.然而,古乡冰期时波堆藏布江流域冰川作用范围、冰量及平衡线高度(ELA)等关键信息,仍有待...

关 键 词:古乡冰期  波堆藏布江  冰川重建  平衡线高度  积累区面积比率  末端-源头高度比率
收稿时间:2021-06-01
修稿时间:2021-06-11

Glacier reconstruction of the Guxiang Glaciation in the Bodui Zangbo Valley in southeastern Tibet
QIN Changxiong,XU Liubing,XIE Jinming,ZHOU Shangzhe. Glacier reconstruction of the Guxiang Glaciation in the Bodui Zangbo Valley in southeastern Tibet[J]. Journal of Glaciology and Geocryology, 2021, 43(3): 724-734. DOI: 10.7522/j.issn.1000-0240.2021.0014
Authors:QIN Changxiong  XU Liubing  XIE Jinming  ZHOU Shangzhe
Affiliation:1.School of Geography,South China Normal University,Guangzhou 510631,China;2.College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
Abstract:The Guxiang Glaciation is one of the most typical glaciations on the Tibetan Plateau during the Quaternary and has been widely used to represent the penultimate glaciation on the plateau. It was named from the frontal-lateral moraine at Guxiang, over 100 km down valley from the source area around the Guanxing Glacier, in the Bodui Zangbo River catchment in southeastern Tibet. Existing cosmogenic radionuclide 10Be surface exposure ages (~130 ka) show that the Guxiang Glaciation occurred during marine oxygen isotope stage 6, however, key information, such as ice volume, ice extent, and equilibrium line altitude (ELA) in the Bodui Zangbo River catchment during the Guxiang Glaciation, is an open question. In this study, we reconstruct the ice extent of the Guxiang Glaciation for the whole catchment on the basis of repeated field investigations, existing numerical dating results of moraines, and high-definition remote sensing images/satellite photos; estimate the ice volume and ice thickness using a glacier surface profile model run in Excel and ArcGIS software; and estimate the ELA of the catchment during the Guxiang Glaciation using the accumulation area ratio (AAR) and toe-to-headwall altitude ratio (THAR) methods. Our results show that during the Guxiang Glaciation, the total glacier area was 2 648 km2, the average glacier thickness was nearly 360 m, and the ice volume around 953 km3. The ice-cover rate has decreased from 63% in the Guxiang Glaciation to the present cover rate of 22.4%. Based on the paleo-glacier surface elevation interpolated with the inverse distance weighting method, the Guxiang Glaciation ELA is estimated to be 3 871 m, which is 584 m lower than the present ELA of 4 455 m. Our ELA estimation result is consistent with existing values.
Keywords:Guxiang Glaciation  Bodui Zangbo River  glacier reconstruction  equilibrium-line altitude (ELA)  accumulation area ratio (AAR)  toe-to-headwall altitude ratio (THAR)  
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