https://scholars.lib.ntu.edu.tw/handle/123456789/626982
標題: | Stalagmite-inferred European westerly drift in the early Weichselian with centennial-scale variability in marine isotope stage 5a | 作者: | Chung, YC Menviel, L Marchionne, A Mii, HS Michel, V Valensi, P Jiang, XY Simon, P Rossoni-Notter, E Moussous, A Seppa, H Chien, YT Wu, CC Hu, HM CHUAN-CHOU SHEN |
關鍵字: | Southern Europe; Stalagmite; Model simulation; Precipitation; Weichselian; MIS 5a; Multi-centennial arid intervals; AMOC; NORTH-ATLANTIC OSCILLATION; LAST GLACIAL MAXIMUM; EARTH SYSTEM MODEL; CLIMATE VARIABILITY; MILLENNIAL-SCALE; OXYGEN-ISOTOPE; MEDITERRANEAN CLIMATE; OBSERVATOIRE CAVE; IBERIAN MARGIN; SOLAR-ACTIVITY | 公開日期: | 15-七月-2022 | 出版社: | PERGAMON-ELSEVIER SCIENCE LTD | 卷: | 288 | 來源出版物: | QUATERNARY SCIENCE REVIEWS | 摘要: | he Weichselian glaciation is characterized by significant ocean circulation variations starting from ∼115 thousand years ago (ka) and terminating at ∼11.5 ka. The early Weichselian (115–74 ka), especially marine isotope stage (MIS) 5a at 85–74 ka, provides a window for understanding the linkage between the European westerlies and Mediterranean climate. However, lack of highly-resolved paleoclimate records with absolute chronologies hampers our knowledge of decadal-to-centennial-scale climate changes and forcings in the circum-Mediterranean realm. Here, we present 230Th-dated stalagmite-inferred hydroclimate records from Observatoire cave (43°44′ N, 7°25’ E), Monaco, for the period between 88.7 ± 0.4 and 80.3 ± 0.1 ka, covering portions of MIS 5b and 5a. Agreement between Observatoire and circum-Mediterranean stalagmite records confirm large-scale warming over the Atlantic-Europe territory during the transition from MIS 5b to 5a. Subdecadally-resolved Observatoire δ18O and δ13C records express four multi-centennial arid intervals in southern Europe at 84–80 ka in the first-half of MIS 5a, suggesting centennial westerly drifts, a finding supported by a model simulation. Westerly changes and associated arid events can be attributed to slowdowns of the Atlantic meridional overturning circulation, North Atlantic Oscillation states, and solar activity. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626982 | ISSN: | 0277-3791 | DOI: | 10.1016/j.quascirev.2022.107581 |
顯示於: | 地質科學系 |
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