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| Main Authors: | , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2008
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| Online Access: | https://doi.org/10.1594/PANGAEA.811709 |
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| _version_ | 1867168563312197632 |
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| author | Tjallingii, Rik Claussen, Martin Stuut, Jan-Berend W Fohlmeister, J Jahn, A Bickert, Torsten Lamy, Frank Röhl, Ursula |
| author_facet | Tjallingii, Rik Claussen, Martin Stuut, Jan-Berend W Fohlmeister, J Jahn, A Bickert, Torsten Lamy, Frank Röhl, Ursula |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The evolution of the northwest African hydrological balance throughout the Pleistocene epoch influenced the migration of prehistoric humans**1. The hydrological balance is also thought to be important to global teleconnection mechanisms during Dansgaard-Oeschger and Heinrich events**2. However, most high-resolution African climate records do not span the millennial-scale climate changes of the last glacial-interglacial cycle**1, 3, 4, 5, or lack an accurate chronology**6. Here, we use grain-size analyses of siliciclastic marine sediments from off the coast of Mauritania to reconstruct changes in northwest African humidity over the past 120,000 years. We compare this reconstruction to simulations of palaeo-humidity from a coupled atmosphere-ocean-vegetation model. These records are in good agreement, and indicate the reoccurrence of precession-forced humid periods during the last interglacial period similar to the Holocene African Humid Period. We suggest that millennial-scale arid events are associated with a reduction of the North Atlantic meridional overturning circulation and that millennial-scale humid events are linked to a regional increase of winter rainfall over the coastal regions of northwest Africa. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811709 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Proxy data and model simulations of sediment core GeoB7920-2 Tjallingii, Rik Claussen, Martin Stuut, Jan-Berend W Fohlmeister, J Jahn, A Bickert, Torsten Lamy, Frank Röhl, Ursula Center for Marine Environmental Sciences; MARUM The evolution of the northwest African hydrological balance throughout the Pleistocene epoch influenced the migration of prehistoric humans**1. The hydrological balance is also thought to be important to global teleconnection mechanisms during Dansgaard-Oeschger and Heinrich events**2. However, most high-resolution African climate records do not span the millennial-scale climate changes of the last glacial-interglacial cycle**1, 3, 4, 5, or lack an accurate chronology**6. Here, we use grain-size analyses of siliciclastic marine sediments from off the coast of Mauritania to reconstruct changes in northwest African humidity over the past 120,000 years. We compare this reconstruction to simulations of palaeo-humidity from a coupled atmosphere-ocean-vegetation model. These records are in good agreement, and indicate the reoccurrence of precession-forced humid periods during the last interglacial period similar to the Holocene African Humid Period. We suggest that millennial-scale arid events are associated with a reduction of the North Atlantic meridional overturning circulation and that millennial-scale humid events are linked to a regional increase of winter rainfall over the coastal regions of northwest Africa. |
| title | Proxy data and model simulations of sediment core GeoB7920-2 |
| topic | Center for Marine Environmental Sciences; MARUM |
| url | https://doi.org/10.1594/PANGAEA.811709 |