noaa-ocean-8445 Northwest Africa 120KYr Continental Humidity Index Reconstruction Tjallingii, R.; Claussen, M.; Stuut, J.-B.W.; Fohlmeister, J.; Jahn, A.; Bickert, T.; Lamy, F.; Röhl, U. Northwest Africa 120KYr Continental Humidity Index Reconstruction 2008-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/8445 Investigator R. Tjallingii Investigator M. Claussen Investigator J.-B.W. Stuut Investigator J. Fohlmeister Investigator A. Jahn Investigator T. Bickert Investigator F. Lamy Investigator U. Röhl earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean reconstruction earth science paleoclimate paleocean age control geoscientificInformation Other Hydroclimate Reconstruction 117885 14C yr BP 520 14C yr BP 117885 cal yr BP 517 cal yr BP Complete 20.7517 20.7517 -18.5817 -18.5817 -2278 -2278 Ocean Atlantic Ocean North Atlantic Ocean GeoB7920-2>LATITUDE 20.7517>LONGITUDE -18.5817 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Tjallingii, R., M. Claussen, J.-B.W. Stuut, J. Fohlmeister, A. Jahn, T. Bickert, F. Lamy, and U. Röhl. 2008. Coherent high- and low-latitude control of the northwest African hydrological balance. Nature Geoscience, 1, 670 - 675.

The evolution of the northwest African hydrological balance throughout the Pleistocene epoch influenced the migration of prehistoric humans. The hydrological balance is also thought to be important to global teleconnection mechanisms during Dansgaard-Oeschger and Heinrich events. However, most high-resolution African climate records do not span the millennial-scale climate changes of the last glacial-interglacial cycle, or lack an accurate chronology. 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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/tjallingii2008 USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11