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| DOI | 10.1038/s41561-022-00920-7 |
| Atmospheric CO2 control of spontaneous millennial-scale ice age climate oscillations | |
| Vettoretti G.; Ditlevsen P.; Jochum M.; Rasmussen S.O. | |
| 发表日期 | 2022 |
| ISSN | 1752-0894 |
| 起始页码 | 300 |
| 结束页码 | 306 |
| 卷号 | 15期号:4 |
| 英文摘要 | Last Glacial millennial-scale climate variability transitioned through distinct cold stadial and warm interstadial states. Here we use Earth system model simulations to demonstrate that nonlinear self-sustained climate oscillations appear spontaneously within a window of glacial-level atmospheric CO2 concentrations (~190–225 parts per million). Outside this window, the system remains in either quasi-stable cold low CO2 or warm high CO2 states, with infrequent and abrupt random transitions driven by noise. In the oscillatory regime, the time between climate transitions is governed by temporal variations in the state of the ocean, atmosphere and sea ice, with CO2 acting as a control on the relative rates of the internal forcing and feedback in the system. The Earth system model results map perfectly to a slow–fast dynamical systems model, where the fixed point of the system transitions into the oscillatory regime through a loss of stability at two critical tipping points, the window boundaries. The deterministic component of the oscillations is modified by a stochastic element associated with internal climate variability. Agreement between observations and the hierarchically disparate models suggests the existence of an internal stochastic climate oscillator, which tracks variations in atmospheric CO2 level through the glacial, acting in concert with noise-induced transitions. © 2022, The Author(s), under exclusive licence to Springer Nature Limited. |
| 语种 | 英语 |
| scopus关键词 | atmosphere; carbon dioxide; ice; interstadial; Last Glacial; oscillation |
| 来源期刊 | Nature Geoscience
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/262221 |
| 作者单位 | Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark |
| 推荐引用方式 GB/T 7714 | Vettoretti G.； Ditlevsen P.； Jochum M.； Rasmussen S.O.. Atmospheric CO2 control of spontaneous millennial-scale ice age climate oscillations[J],2022,15(4). |
| APA | Vettoretti G.； Ditlevsen P.； Jochum M.； Rasmussen S.O..(2022).Atmospheric CO2 control of spontaneous millennial-scale ice age climate oscillations.Nature Geoscience,15(4). |
| MLA | Vettoretti G.； Ditlevsen P.； Jochum M.； Rasmussen S.O.."Atmospheric CO2 control of spontaneous millennial-scale ice age climate oscillations".Nature Geoscience 15.4(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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