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| DOI | 10.1016/j.epsl.2020.116081 |
| A dynamic link between high-intensity precipitation events in southwestern North America and Europe at the Last Glacial Maximum | |
| Lofverstrom M. | |
| 发表日期 | 2020 |
| ISSN | 0012821X |
| 卷号 | 534 |
| 英文摘要 | Both hydroclimate proxies and modeling studies alike present compelling evidence for abundant precipitation in southwestern North America and Europe at the Last Glacial Maximum (LGM). However, model simulations exhibit an apparent disagreement between changes in precipitation and the orientation of the midlatitude jet streams relative to modern. This is surprising, as it is well known from modern observations that the jet streams and storm tracks closely follow one another in the time mean. The present study shows that a substantial fraction (between 35 and 50%) of the precipitation along the western seaboards of the Northern Hemisphere continents at the LGM is due to short lived high-intensity events, rather than a permanent rearrangement of the circulation. Moreover, these precipitation events are shown to be dynamically linked by a wavenumber-5 stationary wave packet that is trapped in a midlatitude waveguide. When the wave energy is concentrated in the eastern North Pacific, an atmospheric river is excited that makes landfall along the North American west coast. Days later, when the wave packet has reached Europe, the North Atlantic jet stream assumes a zonally oriented state that brings abundant precipitation to the western Mediterranean sector. Understanding the dynamics of this teleconnection pattern is not only key for interpreting proxy-data signals in past climates, but may also be important for improving predictions of storm track dynamics and water resources availability in the face of climate variability and change. © 2020 Elsevier B.V. |
| 关键词 | atmospheric dynamicsglobal teleconnectionshydroclimateLast Glacial Maximum |
| 英文关键词 | Climate change; Dynamics; Storms; Water resources; Wave energy conversion; Wave packets; Atmospheric dynamics; Climate variability and change; hydroclimate; Last Glacial Maximum; Teleconnection patterns; Teleconnections; Water resources availability; Western Mediterranean; Glacial geology; atmospheric dynamics; jet stream; Last Glacial Maximum; midlatitude environment; Northern Hemisphere; precipitation (climatology); teleconnection; wave energy; Europe; North America; Pacific Ocean; Pacific Ocean (North) |
| 语种 | 英语 |
| 来源期刊 | Earth and Planetary Science Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/202757 |
| 作者单位 | Department of Geosciences, University of Arizona, 1040 E 4th St, Tucson, AZ, United States |
| 推荐引用方式 GB/T 7714 | Lofverstrom M.. A dynamic link between high-intensity precipitation events in southwestern North America and Europe at the Last Glacial Maximum[J],2020,534. |
| APA | Lofverstrom M..(2020).A dynamic link between high-intensity precipitation events in southwestern North America and Europe at the Last Glacial Maximum.Earth and Planetary Science Letters,534. |
| MLA | Lofverstrom M.."A dynamic link between high-intensity precipitation events in southwestern North America and Europe at the Last Glacial Maximum".Earth and Planetary Science Letters 534(2020). |
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