气候变化领域集成服务门户(CCPortal): CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene

CCPortal

DOI	10.1016/j.epsl.2021.116908
	CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene
	Halberstadt A.R.W.; Chorley H.; Levy R.H.; Naish T.; DeConto R.M.; Gasson E.; Kowalewski D.E.
发表日期	2021
ISSN	0012821X
卷号	564
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
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
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/203112
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
推荐引用方式 GB/T 7714	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],2021,564.
APA	Halberstadt A.R.W..,Chorley H..,Levy R.H..,Naish T..,DeConto R.M..,...&Kowalewski D.E..(2021).CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene.Earth and Planetary Science Letters,564.
MLA	Halberstadt A.R.W.,et al."CO2 and tectonic controls on Antarctic climate and ice-sheet evolution in the mid-Miocene".Earth and Planetary Science Letters 564(2021).