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| DOI | 10.1016/j.gloplacha.2023.104349 |
| Late Pleistocene to modern precipitation changes at the Paranal clay pan, central Atacama Desert | |
| 发表日期 | 2024 |
| ISSN | 0921-8181 |
| EISSN | 1872-6364 |
| 起始页码 | 233 |
| 卷号 | 233 |
| 英文摘要 | The Atacama Desert in Chile is known to be one of the driest deserts on Earth, with dominating hyperaridity at least since the Miocene. During recent times, however, especially the southern part of the Atacama repeatedly experienced exceptional precipitation events, like in 2015 and 2017. Locally, these events with high rainfall rates caused catastrophic floods with significant destruction and human fatalities. Although the meteorological drivers of these heavy rains are widely understood, only little is known about the frequency and amplitude of similar events on geological timescales. Here we present the results of a study on an endorheic clay pan at the southern edge of the hyperarid core of the Atacama, an area with a mean precipitation of approx. 5 mm per year. A modern ground-truthing approach combining sediment data, remote-sensing and meteorological data as well as climate-modelling was applied. Our observations indicate that the clay pan reacted very sensitively to local precipitation during the past 30 years, with four events >20 mm total rain causing sufficient surface run-off in the catchment to partially flood the basin. Comparative analyses of the four events illustrate that the amount of run-off is dependent on the maximum rain rate during the events rather than the total rain sum. A 1.88-m long sediment core recovered from the centre of the clay pan records the local hydrological and -environmental history since the Late Pleistocene. Sedimentological, mineralogical, geochemical, and biological core analyses imply strong variations in the amplitude of the recorded rainfall, with a clear shift from enhanced alluvial activity caused by higher-amplitude rain events during the Late Pleistocene to lower-amplitude Holocene events. The Holocene background sedimentation is superimposed by seven severe Millennial-scale rain events, which imply precipitation maxima on sub-orbital timescales that are potentially driven by changes in the El Nin similar to o Southern Oscillation (ENSO). The results of the study shed new light on the glacial-interglacial but also the suborbital precipitation variability in the Coastal Cordillera of the Atacama Desert and its potential driving mechanisms, and provide perspectives of the future precipitation development in the region under progressive global warming. |
| 英文关键词 | Atacama Desert; Millennial -scale rain events; Hyperaridity; Clay pan; Paleoclimate; Precipitation history |
| 语种 | 英语 |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001164991300001 |
| 来源期刊 | GLOBAL AND PLANETARY CHANGE
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/305608 |
| 作者单位 | University of Cologne; University of Cologne; University of Cologne; Universidade da Coruna; University of Valencia; European Southern Observatory; Universidad Catolica del Norte; Cornell University |
| 推荐引用方式 GB/T 7714 | . Late Pleistocene to modern precipitation changes at the Paranal clay pan, central Atacama Desert[J],2024,233. |
| APA | (2024).Late Pleistocene to modern precipitation changes at the Paranal clay pan, central Atacama Desert.GLOBAL AND PLANETARY CHANGE,233. |
| MLA | "Late Pleistocene to modern precipitation changes at the Paranal clay pan, central Atacama Desert".GLOBAL AND PLANETARY CHANGE 233(2024). |
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