Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect
Relict dune fields that are found as far south as 14° N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always res...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.820486 2023-05-15T17:35:15+02:00 Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect Collins, James A Govin, Aline Mulitza, Stefan Heslop, David Zabel, Matthias Hartmann, Jens Röhl, Ursula Wefer, Gerold MEDIAN LATITUDE: 14.358395 * MEDIAN LONGITUDE: -17.270835 * SOUTH-BOUND LATITUDE: 3.065000 * WEST-BOUND LONGITUDE: -20.998300 * NORTH-BOUND LATITUDE: 36.023500 * EAST-BOUND LONGITUDE: -7.666830 * DATE/TIME START: 1991-12-03T00:00:00 * DATE/TIME END: 2005-07-20T13:59:00 2013-10-16 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.820486 https://doi.org/10.1594/PANGAEA.820486 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.820486 https://doi.org/10.1594/PANGAEA.820486 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Collins, James A; Govin, Aline; Mulitza, Stefan; Heslop, David; Zabel, Matthias; Hartmann, Jens; Röhl, Ursula; Wefer, Gerold (2013): Abrupt shifts of the Sahara–Sahel boundary during Heinrich stadials. Climate of the Past, 9(3), 1181-1191, https://doi.org/10.5194/cp-9-1181-2013 Center for Marine Environmental Sciences MARUM Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.820486 https://doi.org/10.5194/cp-9-1181-2013 2023-01-20T07:33:09Z Relict dune fields that are found as far south as 14° N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always resolved. High-resolution marine core studies have identified Heinrich stadials as the dustiest periods of the last glacial in West Africa although the spatial evolution of dust export on millennial timescales has so far not been investigated. We use the major-element composition of four high-resolution marine sediment cores to reconstruct the spatial extent of Saharan-dust versus river-sediment input to the continental margin from West Africa over the last 60 ka. This allows us to map the position of the sediment composition corresponding to the Sahara-Sahel boundary. Our records indicate that the Sahara-Sahel boundary reached its most southerly position (13° N) during Heinrich stadials and hence suggest that these were the periods when the sand dunes formed at 14° N on the continent. Heinrich stadials are associated with cold North Atlantic sea surface temperatures which appear to have triggered abrupt increases of aridity and wind strength in the Sahel. Our study illustrates the influence of the Atlantic meridional overturning circulation on the position of the Sahara-Sahel boundary and on global atmospheric dust loading. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-20.998300,-7.666830,36.023500,3.065000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Collins, James A Govin, Aline Mulitza, Stefan Heslop, David Zabel, Matthias Hartmann, Jens Röhl, Ursula Wefer, Gerold Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
Relict dune fields that are found as far south as 14° N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always resolved. High-resolution marine core studies have identified Heinrich stadials as the dustiest periods of the last glacial in West Africa although the spatial evolution of dust export on millennial timescales has so far not been investigated. We use the major-element composition of four high-resolution marine sediment cores to reconstruct the spatial extent of Saharan-dust versus river-sediment input to the continental margin from West Africa over the last 60 ka. This allows us to map the position of the sediment composition corresponding to the Sahara-Sahel boundary. Our records indicate that the Sahara-Sahel boundary reached its most southerly position (13° N) during Heinrich stadials and hence suggest that these were the periods when the sand dunes formed at 14° N on the continent. Heinrich stadials are associated with cold North Atlantic sea surface temperatures which appear to have triggered abrupt increases of aridity and wind strength in the Sahel. Our study illustrates the influence of the Atlantic meridional overturning circulation on the position of the Sahara-Sahel boundary and on global atmospheric dust loading. |
format |
Dataset |
author |
Collins, James A Govin, Aline Mulitza, Stefan Heslop, David Zabel, Matthias Hartmann, Jens Röhl, Ursula Wefer, Gerold |
author_facet |
Collins, James A Govin, Aline Mulitza, Stefan Heslop, David Zabel, Matthias Hartmann, Jens Röhl, Ursula Wefer, Gerold |
author_sort |
Collins, James A |
title |
Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
title_short |
Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
title_full |
Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
title_fullStr |
Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
title_full_unstemmed |
Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials demonstrated on a sediment core transect |
title_sort |
abrupt shifts of the sahara-sahel boundary during heinrich stadials demonstrated on a sediment core transect |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.820486 https://doi.org/10.1594/PANGAEA.820486 |
op_coverage |
MEDIAN LATITUDE: 14.358395 * MEDIAN LONGITUDE: -17.270835 * SOUTH-BOUND LATITUDE: 3.065000 * WEST-BOUND LONGITUDE: -20.998300 * NORTH-BOUND LATITUDE: 36.023500 * EAST-BOUND LONGITUDE: -7.666830 * DATE/TIME START: 1991-12-03T00:00:00 * DATE/TIME END: 2005-07-20T13:59:00 |
long_lat |
ENVELOPE(-20.998300,-7.666830,36.023500,3.065000) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Collins, James A; Govin, Aline; Mulitza, Stefan; Heslop, David; Zabel, Matthias; Hartmann, Jens; Röhl, Ursula; Wefer, Gerold (2013): Abrupt shifts of the Sahara–Sahel boundary during Heinrich stadials. Climate of the Past, 9(3), 1181-1191, https://doi.org/10.5194/cp-9-1181-2013 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.820486 https://doi.org/10.1594/PANGAEA.820486 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.820486 https://doi.org/10.5194/cp-9-1181-2013 |
_version_ |
1766134363669397504 |