globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.07.010
Scopus记录号: 2-s2.0-85024407114
论文题名:
Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period
作者: Zielhofer C.; von Suchodoletz H.; Fletcher W.J.; Schneider B.; Dietze E.; Schlegel M.; Schepanski K.; Weninger B.; Mischke S.; Mikdad A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 171
起始页码: 119
结束页码: 135
语种: 英语
英文关键词: Dust record ; Holocene ; Inorganic geochemistry ; Morocco ; North Atlantic ; Palaeoclimatology ; Palaeolimnology ; Sahara ; Western Mediterranean
Scopus关键词: Atmospheric pressure ; Driers (materials) ; Ecosystems ; Geochemistry ; Oceanography ; Holocenes ; Inorganic geochemistries ; Morocco ; North Atlantic ; Palaeoclimatology ; Palaeolimnology ; Sahara ; Western Mediterranean ; Dust ; Ostracoda
英文摘要: The Sahara is the world's largest dust source with significant impacts on trans-Atlantic terrestrial and large-scale marine ecosystems. Contested views about a gradual or abrupt onset of Saharan aridity at the end of the African Humid Period dominate the current scientific debate about the Holocene Saharan desiccation. In this study, we present a 19.63 m sediment core sequence from Lake Sidi Ali (Middle Atlas, Morocco) at the North African desert margin. We reconstruct the interaction between Saharan dust supply and Western Mediterranean hydro-climatic variability during the last 12,000 yr based on analyses of lithogenic grain-sizes, XRF geochemistry and stable isotopes of ostracod shells. A robust chronological model based on AMS 14C dated pollen concentrates supports our multi-proxy study. At orbital-scale there is an overall increase in southern dust supply from the Early Holocene to the Late Holocene, but our Northern Saharan dust record indicates that a gradual Saharan desiccation was interrupted by multiple abrupt dust increases before the ‘southern dust mode’ was finally established at 4.7 cal ka BP. The Sidi Ali record features millennial peaks in Saharan dust increase at about 11.1, 10.2, 9.4, 8.2, 7.3, 6.6, 6.0, and 5.0 cal ka BP. Early Holocene Saharan dust peaks coincide with Western Mediterranean winter rain minima and North Atlantic cooling events. In contrast, Late Holocene dust peaks correspond mostly with prevailing positive phases of the North Atlantic Oscillation. By comparing with other North African records, we suggest that increases in Northern Saharan dust supply do not solely indicate sub-regional to regional aridity in Mediterranean Northwest Africa but might reflect aridity at a trans-Saharan scale. In particular, our findings support major bimillennial phases of trans-Saharan aridity at 10.2, 8.2, 6.0 and 4.2 cal ka BP. These phases coincide with North Atlantic cooling and a weak African monsoon. © 2017 The Authors
资助项目: Christoph Zielhofer, Steffen Mischke and William Fletcher as principal investigators thank the German Research Foundation (DFG, ZI 721/9-1), the Federal Ministry of Education and Research (BMBF, 01DH17020) 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. Rik Tjallingii is highly acknowledged for conducting the ITRAX XRF core scanner measurements at GFZ Potsdam. Finally, the authors are grateful to two anonymous reviewers and Ana Moreno 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/59139
Appears in Collections:过去全球变化的重建

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作者单位: Chair of Physical Geography, Leipzig University, Leipzig, Germany; Department of Geography, School of Environment, Education and Development, University of Manchester, Manchester, United Kingdom; GFZ German Research Centre for Geosciences, Section 5.2, Climate Dynamics and Landscape Evolution, Potsdam, Germany; TROPOS – Leibniz Institute for Tropospheric Research, Leipzig, Germany; Institute of Pre- and Early History, Cologne University, Cologne, Germany; Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland; Institut National des Sciences de l'Archéologie et du Patrimoine, Rabat, Morocco

Recommended Citation:
Zielhofer C.,von Suchodoletz H.,Fletcher W.J.,et al. Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period[J]. Quaternary Science Reviews,2017-01-01,171
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