Arid
DOI10.1016/j.quascirev.2017.07.010
Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period
Zielhofer, Christoph1; von Suchodoletz, Hans1; Fletcher, William J.2; Schneider, Birgit1; Dietze, Elisabeth3; Schlegel, Michael1; Schepanski, Kerstin4; Weninger, Bernhard5; Mischke, Steffen6; Mikdad, Abdeslam7
通讯作者Zielhofer, Christoph
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2017
卷号171页码:119-135
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 All (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 C-14 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. (C) 2017 The Authors. Published by Elsevier Ltd.


英文关键词Holocene Palaeolimnology Palaeoclimatology North Atlantic Western Mediterranean Morocco Sahara Dust record Inorganic geochemistry
类型Article
语种英语
国家Germany ; England ; Iceland ; Morocco
收录类别SCI-E
WOS记录号WOS:000410869400009
WOS关键词HOLOCENE CLIMATE-CHANGE ; GRAIN-SIZE ; ATLANTIC CLIMATE ; NORTHERN AFRICA ; TIBETAN PLATEAU ; DESERT DUST ; VARIABILITY ; TRANSPORT ; SEDIMENT ; TERMINATION
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201862
作者单位1.Univ Leipzig, Chair Phys Geog, Leipzig, Germany;
2.Univ Manchester, Sch Environm Educ & Dev, Dept Geog, Manchester, Lancs, England;
3.GFZ German Res Ctr Geosci, Climate Dynam & Landscape Evolut, Sect 5-2, Potsdam, Germany;
4.TROPOS Leibniz Inst Tropospher Res, Leipzig, Germany;
5.Univ Cologne, Inst Pre & Early Hist, Cologne, Germany;
6.Univ Iceland, Fac Earth Sci, Reykjavik, Iceland;
7.Inst Natl Sci Archeol & Patrimoine, Rabat, Morocco
推荐引用方式
GB/T 7714
Zielhofer, Christoph,von Suchodoletz, Hans,Fletcher, William J.,et al. Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period[J],2017,171:119-135.
APA Zielhofer, Christoph.,von Suchodoletz, Hans.,Fletcher, William J..,Schneider, Birgit.,Dietze, Elisabeth.,...&Mikdad, Abdeslam.(2017).Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period.QUATERNARY SCIENCE REVIEWS,171,119-135.
MLA Zielhofer, Christoph,et al."Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period".QUATERNARY SCIENCE REVIEWS 171(2017):119-135.
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