globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.11.037
Scopus记录号: 2-s2.0-85006713623
论文题名:
Atlantic forcing of Western Mediterranean winter rain minima during the last 12,000 years
作者: Zielhofer C.; Fletcher W.J.; Mischke S.; De Batist M.; Campbell J.F.E.; Joannin S.; Tjallingii R.; El Hamouti N.; Junginger A.; Stele A.; Bussmann J.; Schneider B.; Lauer T.; Spitzer K.; Strupler M.; Brachert T.; Mikdad A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 157
起始页码: 29
结束页码: 51
语种: 英语
英文关键词: Atlantic forcing ; Holocene ; Lake sediments ; Middle Atlas ; Morocco ; North Atlantic Oscillation (NAO) ; Seasonality ; Solar forcing ; Western Mediterranean ; Winter rain minima ; Younger Dryas
Scopus关键词: Atmospheric pressure ; Charcoal ; Lakes ; Magnetic susceptibility ; Meteorology ; Rain ; Atlantic forcing ; Holocenes ; Lake sediments ; Middle Atlas ; Morocco ; North Atlantic oscillations ; Seasonality ; Solar forcing ; Western Mediterranean ; Winter rains ; Younger Dryas ; Climate change ; air mass ; alga ; climate forcing ; historical record ; Holocene ; hydrometeorology ; lacustrine deposit ; North Atlantic Oscillation ; ostracod ; paleohydrology ; pollen ; proxy climate record ; radiocarbon dating ; reconstruction ; seasonality ; solar activity ; transition zone ; Younger Dryas ; Atlas Mountains ; Mediterranean Sea ; Mediterranean Sea (West) ; Middle Atlas ; Morocco ; Sahara ; Bacillariophyta ; Cedrus ; Ostracoda
英文摘要: The limited availability of high-resolution continuous archives, insufficient chronological control, and complex hydro-climatic forcing mechanisms lead to many uncertainties in palaeo-hydrological reconstructions for the Western Mediterranean. In this study we present a newly recovered 19.63 m long core from Lake Sidi Ali in the North African Middle Atlas, a transition zone of Atlantic, Western Mediterranean and Saharan air mass trajectories. With a multi-proxy approach based on magnetic susceptibility, carbonate and total organic C content, core-scanning and quantitative XRF, stable isotopes of ostracod shells, charcoal counts, Cedrus pollen abundance, and a first set of diatom data, we reconstruct Western Mediterranean hydro-climatic variability, seasonality and forcing mechanisms during the last 12,000 yr. A robust chronological model based on AMS 14C dated pollen concentrates supports our high-resolution multi-proxy study. Long-term trends reveal low lake levels at the end of the Younger Dryas, during the mid-Holocene interval 6.6 to 5.4 cal ka BP, and during the last 3000 years. In contrast, lake levels are mostly high during the Early and Mid-Holocene. The record also shows sub-millennial- to centennial-scale decreases in Western Mediterranean winter rain at 11.4, 10.3, 9.2, 8.2, 7.2, 6.6, 6.0, 5.4, 5.0, 4.4, 3.5, 2.9, 2.2, 1.9, 1.7, 1.5, 1.0, 0.7, and 0.2 cal ka BP. Early Holocene winter rain minima are in phase with cooling events and millennial-scale meltwater discharges in the sub-polar North Atlantic. Our proxy parameters do not show so far a clear impact of Saharan air masses on Mediterranean hydro-climate in North Africa. However, a significant hydro-climatic shift at the end of the African Humid Period (∼5 ka) indicates a change in climate forcing mechanisms. The Late Holocene climate variability in the Middle Atlas features a multi-centennial-scale NAO-type pattern, with Atlantic cooling and Western Mediterranean winter rain maxima generally associated with solar minima. © 2016 The Author(s)
资助项目: Christoph Zielhofer, Steffen Mischke and William Fletcher as principal investigators thank the German Research Foundation (DFG, ZI 721/9-1) and the Natural Environment Research Council (New Investigator Award to W Fletcher, NE/K000608/1, and NERC RCF dating awards, 1765.1013 and 1809.0414) for generous funding of the fieldwork and lab analyses. The authors are grateful to the Institut National des Sciences de l'Archéologie et du Patrimoine (INSAP, Rabat), the Centre National d'Hydrobiologie et de Pisciculture (CNHP, Azrou) and to the Caidad d'Azrou for helpful support in field and in preparing the expedition in autumn 2012. Acknowledgements to Mustapha Rhanem for assistance in obtaining the Sidi Ali meteorological data. Hanno Meyer of the stable isotope laboratory at AWI Potsdam is highly acknowledged for providing the stable water isotope data. Finally, the authors are grateful to two anonymous reviewers for helpful comments and suggestions.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59328
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作者单位: Institute of Geography, Leipzig University, Leipzig, Germany; School of Environment and Development, University of Manchester, Manchester, United Kingdom; Faculty of Earth Sciences, University of Iceland, Reykjavik, Iceland; Renard Centre of Marine Geology, Ghent University, Ghent, Belgium; Institut des Sciences de l'Evolution, Montpellier University, France; GFZ German Research Centre for Geosciences, Section 5.2 – Climate Dynamics and Landscape Evolution, Potsdam, Germany; Faculté Pluridisciplinaire Nador, Université Mohamed I Oujda, Morocco; Faculty of Geosciences, Tübingen University, Germany; Institute of Geography, Osnabruck University, Osnabruck, Germany; Max Planck Institute for Evolutionary Anthropology, Department of Human Evolution, Leipzig, Germany; Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany; Department of Earth Sciences, ETH Zurich, Switzerland; Institute of Geophysics and Geology, Leipzig University, Leipzig, Germany; Institut National des Sciences de l'Archéologie et du Patrimoine, Rabat, Morocco

Recommended Citation:
Zielhofer C.,Fletcher W.J.,Mischke S.,et al. Atlantic forcing of Western Mediterranean winter rain minima during the last 12,000 years[J]. Quaternary Science Reviews,2017-01-01,157
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