noaa-ocean-23112 Niger Delta Mg/Ca Data over the Last 21 Kyr Schmidt, M.W.; Chang, P.; Parker, A.O.; Ji, L.; He, F. Niger Delta Mg/Ca Data over the Last 21 Kyr 2017-11-21 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23112 Investigator M.W. Schmidt Investigator P. Chang Investigator A.O. Parker Investigator L. Ji Investigator F. He earth science paleoclimate paleoceanography magnesium/calcium,Globorotalia crassaformis,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography number of samples,null,null,count,null,paleoceanography,null,null,N,number of analyses earth science paleoclimate paleoceanography magnesium/calcium,Globorotalia crassaformis,one standard deviation,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean trace metals in carbonates geoscientificInformation 20910 cal yr BP 550 cal yr BP Complete 4.81 4.81 4.45 4.45 -1178 -1178 Ocean Atlantic Ocean North Atlantic Ocean Fan 17, Niger Delta>LATITUDE 4.81>LONGITUDE 4.45 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Schmidt, Matthew W., Ping Chang, Andrew O. Parker, Link Ji and Feng He 2017 Scientific Reports 7 15390 1-11 10.1038/s41598-017-15637-6

Multiple lines of evidence show that cold stadials in the North Atlantic were accompanied by both reductions in Atlantic Meridional Overturning Circulation (AMOC) and collapses of the West African Monsoon (WAM). Although records of terrestrial change identify abrupt WAM variability across the deglaciation, few studies show how ocean temperatures evolved across the deglaciation. To identify the mechanism linking AMOC to the WAM, we generated a new record of subsurface temperature variability over the last 21 kyr based on Mg/Ca ratios in a sub-thermocline dwelling planktonic foraminifera in an Eastern Equatorial Atlantic (EEA) sediment core from the Niger Delta. Our subsurface temperature record shows abrupt subsurface warming during both the Younger Dryas (YD) and Heinrich Event 1. We also conducted a new transient coupled ocean-atmosphere model simulation across the YD that better resolves the western boundary current dynamics and find a strong negative correlation between AMOC strength and EEA subsurface temperatures caused by changes in ocean circulation and rainfall responses that are consistent with the observed WAM change. Our combined proxy and modeling results provide the first evidence that an oceanic teleconnection between AMOC strength and subsurface temperature in the EEA impacted the intensity of the WAM on millennial time scales. STUDY NOTES: Provided Keywords: Deglaciation, abrupt climate change, West African Monsoon, Mg/Ca temperature, subsurface temperature, Niger delta, Younger Dryas, Heinrich Event 1, LGM, GCM modelling, Globorotalia crassaformis

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2017/schmidt2017-fan17.txt NOAA Template File; Fan 17 Mg/Ca Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11