Han, Changhee; Do Hur, Soon; Han, Yeongcheol; Lee, Khanghyun; Hong, Sungmin; Erhardt, Tobias; Fischer, Hubertus; Svensson, Anders M.; Steffensen, Jørgen Peder; Vallelonga, Paul (2018). High-resolution isotopic evidence for a potential Saharan provenance of Greenland glacial dust. Scientific Reports, 8(1) Nature Publishing Group 10.1038/s41598-018-33859-0
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Dust concentrations in Greenland ice show pronounced glacial/interglacial variations with almost two orders of magnitude increase during the Last Glacial Maximum. Greenland glacial dust was previously sourced to two East Asian deserts: the Taklimakan and Gobi deserts. Here we report the first high-resolution Pb and Sr isotopic evidence for a significant Saharan dust influence in Greenland during the last glacial period, back to ~31 kyr ago, from the Greenland NEEM ice core. We find that during Greenland Stadials 3–5.1 (~31 to 23 kyr ago), the primary dust provenance was East Asia, as previously proposed. Subsequently, the Saharan isotopic signals emerge during Greenland Stadials 2.1a–2.1c (~22.6 to 14.7 kyr ago) and from the late Bølling-Allerød to the Younger Dryas periods (~13.6 to 12 kyr ago), coincident with increased aridity in the Sahara and efficient northward transport of dust during these cold periods. A mixing isotopic model proposes the Sahara as an important source, accounting for contribution to Greenland glacial dust of up to 50%, particularly during Greenland Stadial 2.1b and the late Bølling-Allerød to the Younger Dryas periods. Our findings provide new insights into climate-related dust provenance changes and essential paleoclimatic constraints on dust-climate feedbacks in northern high latitudes.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Climate and Environmental Physics 10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) 08 Faculty of Science > Physics Institute |
UniBE Contributor: |
Erhardt, Tobias, Fischer, Hubertus |
Subjects: |
500 Science > 530 Physics |
ISSN: |
2045-2322 |
Publisher: |
Nature Publishing Group |
Language: |
English |
Submitter: |
Hubertus Fischer |
Date Deposited: |
13 Jun 2019 15:53 |
Last Modified: |
05 Dec 2022 15:27 |
Publisher DOI: |
10.1038/s41598-018-33859-0 |
BORIS DOI: |
10.7892/boris.128731 |
URI: |
https://boris.unibe.ch/id/eprint/128731 |
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