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| DOI | 10.1016/j.quascirev.2020.106492 |
| Present day Jakobshavn Isbræ close to the Holocene minimum extent | |
| Kajanto K.; Seroussi H.; de Fleurian B.; Nisancioglu K.H. | |
| 发表日期 | 2020 |
| ISSN | 0277-3791 |
| 卷号 | 246 |
| 英文摘要 | Marine terminating glaciers evolve on millenial timescales in response to changes in oceanic and atmospheric conditions. However, the relative role of oceanic and atmospheric drivers remains uncertain. The evolution of marine terminating glaciers under the warmer than present Holocene Climate Optimum climate can give important insights into the dynamics of ice streams as the climate evolves. The early Holocene evolution of Jakobshavn Isbræ, from the Last Glacial Maximum extent up to 8.2 ka BP is well constrained by geomorphological studies in the area. However, the Holocene minimum extent of the glacier is unknown. Here, we use a high-resolution regional ice sheet model to study the retreat and readvance of Jakobshavn Isbræ from the Mid-Holocene to the Little Ice Age. This model of Jakobshavn Isbræ accurately tracks the terrestrial ice margin and agrees with available estimates of marine grounding line evolution. We find that the Holocene minimum extent of both the terrestrial ice margin and the grounding line, reached at 6–5 ka BP, is close to the present day extent of the glacier. We also find that the glacier is currently located close to a tipping point, from beyond which readvance would require a longer and more significant cooling than the Little Ice Age. We assess the importance of the ocean forcing in explaining the Holocene evolution of Jakobshavn, and find that cooling within the fjord during the Mid-Holocene is critical for the glacier to readvance. This finding emphasizes the role of ocean forcing when trying to understand the millenial scale evolution of marine terminating glaciers. © 2020 The Author(s) |
| 英文关键词 | Glaciology; Greenland; Holocene; Ice-ocean interaction; Jakobhsavn Isbræ; Marine terminating glaciers; Modeling; Paleo ice-sheets |
| 语种 | 英语 |
| scopus关键词 | Glacial geology; Atmospheric conditions; Geomorphological studies; Grounding line; High resolution; Holocene climate; Ice sheet models; Last Glacial Maximum; Little Ice Age; Ice; accuracy assessment; atmospheric forcing; climate conditions; climate variation; fjord; grounding line; Holocene; ice margin; ice sheet; ice stream; Last Glacial Maximum; Little Ice Age; Arctic; Greenland; Jakobshavn Glacier |
| 来源期刊 | Quaternary Science Reviews
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/151324 |
| 作者单位 | Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway |
| 推荐引用方式 GB/T 7714 | Kajanto K.,Seroussi H.,de Fleurian B.,et al. Present day Jakobshavn Isbræ close to the Holocene minimum extent[J],2020,246. |
| APA | Kajanto K.,Seroussi H.,de Fleurian B.,&Nisancioglu K.H..(2020).Present day Jakobshavn Isbræ close to the Holocene minimum extent.Quaternary Science Reviews,246. |
| MLA | Kajanto K.,et al."Present day Jakobshavn Isbræ close to the Holocene minimum extent".Quaternary Science Reviews 246(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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