Monsoon-driven Saharan dust variability over the past 240,000 years
Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 103 to 106 years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing stron...
| Main Authors: | , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Association for the Advancement of Science (AAAS)
2020
|
| Online Access: | https://hdl.handle.net/1721.1/124920 |
| _version_ | 1826216281781567488 |
|---|---|
| author | Skonieczny, C. McGee, David Winckler, G. Bory, A. Bradtmiller, L. I. Kinsley, Christopher William Polissar, P. J. De Pol-Holz, R. Rossignol, L. Malaizé, B. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Skonieczny, C. McGee, David Winckler, G. Bory, A. Bradtmiller, L. I. Kinsley, Christopher William Polissar, P. J. De Pol-Holz, R. Rossignol, L. Malaizé, B. |
| author_sort | Skonieczny, C. |
| collection | MIT |
| description | Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 103 to 106 years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing strong precessional variability. Here, we present the first Saharan dust record spanning multiple glacial cycles obtained using 230Th normalization, an improved method of calculating fluxes. Contrary to previous data, our record from the West African margin demonstrates high correlation with summer insolation and limited glacial-interglacial changes, indicating coherent variability in the African monsoon belt throughout the late Pleistocene. Our results demonstrate that low-latitude Saharan dust emissions do not vary synchronously with high- and mid-latitude dust emissions, and they call into question the use of existing Plio-Pleistocene dust records to investigate links between climate and hominid evolution. ©2019 |
| first_indexed | 2024-09-23T16:45:12Z |
| format | Article |
| id | mit-1721.1/124920 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:45:12Z |
| publishDate | 2020 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/1249202022-10-03T08:03:13Z Monsoon-driven Saharan dust variability over the past 240,000 years Skonieczny, C. McGee, David Winckler, G. Bory, A. Bradtmiller, L. I. Kinsley, Christopher William Polissar, P. J. De Pol-Holz, R. Rossignol, L. Malaizé, B. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 103 to 106 years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing strong precessional variability. Here, we present the first Saharan dust record spanning multiple glacial cycles obtained using 230Th normalization, an improved method of calculating fluxes. Contrary to previous data, our record from the West African margin demonstrates high correlation with summer insolation and limited glacial-interglacial changes, indicating coherent variability in the African monsoon belt throughout the late Pleistocene. Our results demonstrate that low-latitude Saharan dust emissions do not vary synchronously with high- and mid-latitude dust emissions, and they call into question the use of existing Plio-Pleistocene dust records to investigate links between climate and hominid evolution. ©2019 NSF (award no. OCE-1502985/1502925) 2020-04-29T14:09:53Z 2020-04-29T14:09:53Z 2019-01 Article http://purl.org/eprint/type/JournalArticle 2375-2548 https://hdl.handle.net/1721.1/124920 Skonieczny, C., et al., "Monsoon-driven Saharan dust variability over the past 240,000 years." Science Advances 5, 1 (2019): no. eaav1887 doi 10.1126/sciadv.aav1887 ©2019 Author(s) 10.1126/sciadv.aav1887 Science Advances Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ application/pdf American Association for the Advancement of Science (AAAS) Science Advances |
| spellingShingle | Skonieczny, C. McGee, David Winckler, G. Bory, A. Bradtmiller, L. I. Kinsley, Christopher William Polissar, P. J. De Pol-Holz, R. Rossignol, L. Malaizé, B. Monsoon-driven Saharan dust variability over the past 240,000 years |
| title | Monsoon-driven Saharan dust variability over the past 240,000 years |
| title_full | Monsoon-driven Saharan dust variability over the past 240,000 years |
| title_fullStr | Monsoon-driven Saharan dust variability over the past 240,000 years |
| title_full_unstemmed | Monsoon-driven Saharan dust variability over the past 240,000 years |
| title_short | Monsoon-driven Saharan dust variability over the past 240,000 years |
| title_sort | monsoon driven saharan dust variability over the past 240 000 years |
| url | https://hdl.handle.net/1721.1/124920 |
| work_keys_str_mv | AT skoniecznyc monsoondrivensaharandustvariabilityoverthepast240000years AT mcgeedavid monsoondrivensaharandustvariabilityoverthepast240000years AT wincklerg monsoondrivensaharandustvariabilityoverthepast240000years AT borya monsoondrivensaharandustvariabilityoverthepast240000years AT bradtmillerli monsoondrivensaharandustvariabilityoverthepast240000years AT kinsleychristopherwilliam monsoondrivensaharandustvariabilityoverthepast240000years AT polissarpj monsoondrivensaharandustvariabilityoverthepast240000years AT depolholzr monsoondrivensaharandustvariabilityoverthepast240000years AT rossignoll monsoondrivensaharandustvariabilityoverthepast240000years AT malaizeb monsoondrivensaharandustvariabilityoverthepast240000years |