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
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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.
DeConto, R.
中科院分区:
地球科学2区
文献类型:
--
作者:
Pollard, D.;DeConto, R.

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自南极冰盖形成以来~34 Ma,有关其变化的大部分知识都来自大陆架上的海洋沉积物,这些沉积物是在冰海或冰下环境中通过前进和后退的接地冰沉积的,今天通过地震剖面和取芯进行观察。在这里,我们应用一个3-D耦合冰盖和沉积物模型从40马到现在,直接连接冰盖的变化与沉积物记录的目标。冰盖模型采用垂直平均冰动力学和参数化接地线通量。沉积物模型包括基岩采石、冰下运输和海洋沉积。大气和海洋强迫是由现代气候学的均匀变化决定的,与大气CO2、深海芯δ 18 O和轨道日射变化的记录成比例。该模型在过去4000万年内以粗分辨率(80或160公里)连续运行,在单个自洽模拟中对后始新世冰、景观演变和近海沉积物包进行建模。地层和不整合面是通过记录模型沉积物堆内的沉积时间来追踪的,可以直接与观测到的地震剖面进行比较。最初的基岩地形被初始化为34马地质重建,或使用迭代程序,产生独立的估计古基岩地形。初步结果与公认的新生代冰盖的变化,现代沉积物分布和地震剖面,现代和古基岩地形。
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.
DOI: 10.5194/cp-12-1519-2016
发表时间: 2016-01-01
影响因子: 4.3
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DOI: --
发表时间: 2005
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发表时间: 2016
期刊: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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发表时间: 2018
影响因子: 1
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