{"NOAAStudyId":"8445","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2008-07-01","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-8445.xml","doi":null,"earliestYearBP":117885,"earliestYearCE":-115935,"entryId":"noaa-ocean-8445","funding":[],"investigators":"Tjallingii, R.; Claussen, M.; Stuut, J.-B.W.; Fohlmeister, J.; Jahn, A.; Bickert, T.; Lamy, F.; Röhl, U.","mostRecentYearBP":517,"mostRecentYearCE":1433,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/8445","originalSource":null,"publication":[{"abstract":"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.","author":null,"citation":"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.","edition":null,"identifier":null,"issue":null,"journal":"Nature Geoscience","pages":null,"pubRank":"1","pubYear":2008,"reportNumber":null,"title":"Coherent high- and low-latitude control of the northwest African hydrological balance","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Other Hydroclimate Reconstruction"],"site":[{"NOAASiteId":"22724","geo":{"geoType":"Feature","geometry":{"coordinates":["20.7517","-18.5817"],"type":"POINT"},"properties":{"easternmostLongitude":"-18.5817","maxElevationMeters":"-2278","minElevationMeters":"-2278","northernmostLatitude":"20.7517","southernmostLatitude":"20.7517","westernmostLongitude":"-18.5817"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"12244","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>carbon isotopes","earth science>paleoclimate>paleocean>oxygen isotopes","earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/tjallingii2008","linkText":"tjallingii2008","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"GeoB7920-2","dataTableNotes":null,"earliestYear":117885,"earliestYearBP":117885,"earliestYearCE":-115935,"mostRecentYear":520,"mostRecentYearBP":517,"mostRecentYearCE":1433,"species":[],"timeUnit":"14C yr BP"}],"siteName":"GeoB7920-2"}],"studyCode":null,"studyName":"Northwest Africa 120KYr Continental Humidity Index Reconstruction","studyNotes":"","version":"1.0","xmlId":"2588"}