globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116908
论文题名:
CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene
作者: Halberstadt A.R.W.; Chorley H.; Levy R.H.; Naish T.; DeConto R.M.; Gasson E.; Kowalewski D.E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 564
语种: 英语
中文关键词: Antarctic ice sheet ; climate model ; ice sheet model ; Miocene ; Transantarctic Mountain uplift
英文关键词: Carbon dioxide ; Earth (planet) ; Glacial geology ; Glaciers ; Ice ; Landforms ; Vegetation ; Antarctic climate ; Antarctic ice sheets ; Climatic conditions ; CO$-2$/ concentration ; Ice sheet ; Ice sheet modelling ; Miocene ; Tectonic control ; Transantarctic mountain uplift ; Wilkes land basins ; Climate models ; carbon monoxide ; climate modeling ; geological record ; ice sheet ; Miocene ; paleoclimate ; reconstruction ; sea ice ; structural control ; tectonic evolution ; tectonic setting ; Antarctic Ice Sheet ; Antarctica
英文摘要: Antarctic ice sheet and climate evolution during the mid-Miocene has direct relevance for understanding ice sheet (in)stability and the long-term response to elevated atmospheric CO2 in the future. Geologic records reconstruct major fluctuations in the volume and extent of marine and terrestrial ice during the mid-Miocene, revealing a dynamic Antarctic ice-sheet response to past climatic variations. We use an ensemble of climate – ice sheet – vegetation model simulations spanning a range of CO2 concentrations, Transantarctic Mountain uplift scenarios, and glacial/interglacial climatic conditions to identify climate and ice-sheet conditions consistent with Antarctic mid-Miocene terrestrial and marine geological records. We explore climatic variability at both continental and regional scales, focusing specifically on Victoria Land and Wilkes Land Basin regions using a high-resolution nested climate model over these domains. We find that peak warmth during the Miocene Climate Optimum is characterized by a thick terrestrial ice sheet receded from the coastline under high CO2 concentrations. During the Middle Miocene Climate Transition, CO2 episodically dropped below a threshold value for marine-based ice expansion. Comparison of model results with geologic data support ongoing Transantarctic Mountain uplift throughout the mid-Miocene. Modeled ice sheet dynamics over the Wilkes Land Basin were highly sensitive to CO2 concentrations. This work provides a continental-wide context for localized geologic paleoclimate and vegetation records, integrating multiple datasets to reconstruct snapshots of ice sheet and climatic conditions during a pivotal period in Earth's history. © 2021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165490
Appears in Collections:气候变化与战略

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作者单位: Climate System Research Center, University of Massachusetts, Amherst, MA 01003, United States; Antarctic Research Centre, Victoria University of Wellington, Wellington, 6012, New Zealand; GNS Science, Avalon, Lower Hutt, 5040, New Zealand; School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Department of Earth, Environment, and Physics, Worcester State University, Worcester, MA 01602, United States

Recommended Citation:
Halberstadt A.R.W.,Chorley H.,Levy R.H.,et al. CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene[J]. Earth and Planetary Science Letters,2021-01-01,564
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