气候变化领域集成服务门户(CCPortal): Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model

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DOI	10.1016/j.palaeo.2019.109374
	Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model
	Pollard D.; DeConto R.M.
发表日期	2020
ISSN	0031-0182
卷号	537
英文摘要	Much of the knowledge of Antarctic Ice Sheet variations since its inception ~34 Ma derives from marine sediments on the continental shelf, deposited in glacimarine or sub-ice environments by advancing and retreating grounded ice, and observed today by seismic profiling and coring. Here we apply a 3-D coupled ice sheet and sediment model from 40 Ma to the present, with the goal of directly linking ice-sheet variations with the sediment record. The ice-sheet model uses vertically averaged ice dynamics and parameterized grounding-line flux. The sediment model includes quarrying of bedrock, sub-ice transport, and marine deposition. Atmospheric and oceanic forcing are determined by uniform shifts to modern climatology in proportion to records of atmospheric CO2, deep-sea-core δ18O, and orbital insolation variations. The model is run continuously over the last 40 Myr at coarse resolution (80 or 160 km), modeling post-Eocene ice, landscape evolution and off-shore sediment packages in a single self-consistent simulation. Strata and unconformities are tracked by recording times of deposition within the model sediment stacks, which can be compared directly with observed seismic profiles. The initial bedrock topography is initialized to 34 Ma geologic reconstructions, or an iterative procedure is used that yields independent estimates of paleo bedrock topography. Preliminary results are compared with recognized Cenozoic ice-sheet variations, modern sediment distributions and seismic profiles, and modern and paleo bedrock topographies. © 2019 Elsevier B.V.
英文关键词	Antarctic ice sheet evolution; Bedrock erosion; Bedrock topography; Cenozoic; Marine sediments
语种	英语
scopus关键词	atmosphere-ocean coupling; bedrock; Cenozoic; climate forcing; climate modeling; continental shelf; glacier retreat; grounding line; historical record; marine sediment; paleoclimate; paleoenvironment; reconstruction; simulation; topography
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150751
作者单位	Earth and Environmental Systems Institute, Pennsylvania State University, University ParkPA 16802, United States; Department of Geosciences, University of Massachusetts, Amherst, MA 01003, United States
推荐引用方式 GB/T 7714	Pollard D.,DeConto R.M.. Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model[J],2020,537.
APA	Pollard D.,&DeConto R.M..(2020).Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model.Palaeogeography, Palaeoclimatology, Palaeoecology,537.
MLA	Pollard D.,et al."Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model".Palaeogeography, Palaeoclimatology, Palaeoecology 537(2020).