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DOI | 10.1029/2019GL082163 |
Transient Variability of the Miocene Antarctic Ice Sheet Smaller Than Differences | |
Stap, L. B.1; Sutter, J.1,2,3; Knorr, G.1; Staerz, M.1; Lohmann, G.1 | |
2019-04-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:8页码:4288-4298 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Switzerland |
英文摘要 | During the early to mid-Miocene, benthic delta O-18 records indicate large ice volume fluctuations of the Antarctic ice sheet (AIS) on multiple timescales. Hitherto, research has mainly focused on how CO2 and insolation changes control an equilibrated AIS. However, transient AIS dynamics remain largely unexplored. Here, we study Miocene AIS variability, using an ice sheet-shelf model forced by climate model output with various CO2 levels and orbital conditions. Besides equilibrium simulations, we conduct transient experiments, gradually changing the forcing climate state over time. We show that transient AIS variability is substantially smaller than equilibrium differences. This reduces the contribution of the AIS to delta O-18 fluctuations by more than two thirds on a 40-kyr timescale, hence requiring a larger contribution by deep-sea-temperature variability. The growth rates are much slower than the decay rates, which ensures variability around a preferred small state. Finally, if the bedrock topography enlarges the West Antarctic land surface, AIS self-sustenance increases. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467949200025 |
WOS关键词 | BASAL MELT RATES ; CLIMATE ; MODEL ; SHELF ; SENSITIVITY ; MIDDLE ; TOPOGRAPHY ; INSOLATION ; EVOLUTION ; SURFACE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182512 |
专题 | 气候变化 |
作者单位 | 1.Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Bremerhaven, Germany; 2.Univ Bern, Climate & Environm Phys, Phys Inst, Bern, Switzerland; 3.Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland |
推荐引用方式 GB/T 7714 | Stap, L. B.,Sutter, J.,Knorr, G.,et al. Transient Variability of the Miocene Antarctic Ice Sheet Smaller Than Differences[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(8):4288-4298. |
APA | Stap, L. B.,Sutter, J.,Knorr, G.,Staerz, M.,&Lohmann, G..(2019).Transient Variability of the Miocene Antarctic Ice Sheet Smaller Than Differences.GEOPHYSICAL RESEARCH LETTERS,46(8),4288-4298. |
MLA | Stap, L. B.,et al."Transient Variability of the Miocene Antarctic Ice Sheet Smaller Than Differences".GEOPHYSICAL RESEARCH LETTERS 46.8(2019):4288-4298. |
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