Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model
Continuous simulations over the last 40 million years with a coupled Antarctic ice sheet-sediment model
复制标题
使用南极冰盖-沉积物耦合模型连续模拟过去 4000 万年
DOI:
10.1016/j.palaeo.2019.109374
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发表时间:
2020
影响因子:
3
通讯作者:
DeConto, R.
中科院分区:
文献类型:
--
作者:
Pollard, D.;DeConto, R.
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.
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影响因子:
4.3
作者:
Dowsett, Harry;Dolan, Aisling;Haywood, Alan
通讯作者:
Haywood, Alan
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
D. Pollard;R. DeConto
通讯作者:
R. DeConto
DOI:
10.1098/rsta.2014.0301
发表时间:
2016
期刊:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子:
--
作者:
R. McKay;P. Barrett;R. Levy;T. Naish;T. Naish;N. Golledge;N. Golledge;A. Pyne
通讯作者:
A. Pyne
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
U. S. Brink;C. Schneider
通讯作者:
C. Schneider
影响因子:
1
作者:
D. Sugden;S. Jamieson
通讯作者:
S. Jamieson