globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116295
论文题名:
Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years
作者: Yan Q.; Owen L.A.; Zhang Z.; Jiang N.; Zhang R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 541
语种: 英语
中文关键词: glaciation ; Himalayan-Tibetan orogen ; ice-sheet modeling ; LGM
英文关键词: Climate change ; Climatic changes ; Ice sheet ; Ice-caps ; Last Glacial Maximum ; Summer temperature ; Tibetans ; Time-scales ; Glacial geology ; climate effect ; climate variation ; glaciation ; glacier advance ; glacier dynamics ; Himalayan orogeny ; ice cap ; Last Glacial Maximum ; numerical model ; orogeny ; paleoclimate ; China ; Himalayas ; Xizang
英文摘要: The evolution of past glaciations over the Himalayan-Tibetan orogen and their links with climate change remain elusive, partially owing to the immense scale of the orogen preventing the investigation of all areas. Numerical modeling aids in filling the gaps, verifying the geologic observations, and exploring forcing factors. Based on a transient climate-ice sheet simulation for the past 20 kyr, we demonstrate that the maximum extent of glaciation over the Himalayan-Tibetan orogen occurs around the last glacial maximum (LGM; defined here at ∼20 ka), with expanded ice caps and extensive valley glaciers and being equivalent to a fourfold/sixfold expansion of today's glacier area/volume. The glacier extent shrinks rapidly after the LGM and reaches the minimum around ∼8–7 ka, followed by a slight long-term advancing trend afterwards. Our results suggest a dominant role of summer temperature in controlling the overall trend of glacier response, with precipitation generally modulating the regional extent of glaciation. However, the timing and extent of glaciation in the simulations varies across the Himalayan-Tibetan orogen on millennial timescale, especially between the monsoon-influenced southern and westerly-influenced western parts, further confirming previous speculations based on glacial geologic records. Despite the uncertainties in the simulations and the discrepancy in glaciation between the simulations and the glacial geologic evidence (e.g., 10Be ages), our results provide additional clues on the relationship between climatic change and glacier response. In addition, the modeling aids in advancing our knowledge of the paleoglaciological history of the Himalayan-Tibetan orogen. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165360
Appears in Collections:气候变化与战略

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作者单位: Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Key Laboratory of Meteorological Disaster/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Department of Marine, Earth, and Atmospheric Science, North Carolina State University, Raleigh, NC 27695, United States; Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China; Uni Research Climate, Bjerknes Center for Climate Research, Bergen, Norway; Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

Recommended Citation:
Yan Q.,Owen L.A.,Zhang Z.,et al. Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years[J]. Earth and Planetary Science Letters,2020-01-01,541
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