气候变化领域集成服务门户(CCPortal): Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years

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DOI	10.1016/j.epsl.2020.116295
	Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years
	Yan Q.; Owen L.A.; Zhang Z.; Jiang N.; Zhang R.
发表日期	2020
ISSN	0012821X
卷号	541
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202982
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
推荐引用方式 GB/T 7714	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],2020,541.
APA	Yan Q.,Owen L.A.,Zhang Z.,Jiang N.,&Zhang R..(2020).Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years.Earth and Planetary Science Letters,541.
MLA	Yan Q.,et al."Deciphering the evolution and forcing mechanisms of glaciation over the Himalayan-Tibetan orogen during the past 20,000 years".Earth and Planetary Science Letters 541(2020).