Eastern Equatorial Atlantic GeoB4905-4 21KYr Mg/Ca SST, SSS, and d18Osw Weldeab, S.; Schneider, R.R.; Kölling, M.; Wefer, G. Weldeab, S. Schneider, R.R. Kölling, M. Wefer, G. Monsoon Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber pink,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber pink,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (salinity,delta 18O|magnesium/calcium|sea surface,null,parts per thousand,null,climate reconstructions|paleoceanography,null,null,N,on G. ruber pink) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,on G. ruber pink) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,on G. ruber pink) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (GeoB4905-4>LATITUDE 2.5>LONGITUDE 9.384) Here we present evidence that the Holocene African monsoon system (AMS) varied in response to the eastern equatorial Atlantic sea-surface temperature (SST). Several short-term episodes of decreased moisture availability as a result of low eastern equatorial Atlantic SST are suggested by planktonic foraminiferal Mg/Ca ratios. These episodes promoted a weakening of the AMS and thus determined the timing and intensity of arid periods. Local sea-surface salinities also reveal regional patterns of precipitation in equatorial western Africa. The high eastern equatorial Atlantic SSTs occur in concert with seasonally increased insolation at low latitudes, suggesting a strong response of African monsoonal precipitation to oceanic conditions at low latitudes. STUDY NOTES: Planktonic foraminiferal (Globigerinoides ruber pink) Mg/Ca and stable oxygen isotope (d18O) measurements, plus calculated Sea Surface Temperature (SST), Sea Surface Salinity (SSS), and d18O of sea water (d18Osw), from an eastern equatorial Atlantic sediment core (offshore Cameroon) for the past 21,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Weldeab, S. Investigator : Schneider, R.R. Investigator : Kölling, M. Investigator : Wefer, G. 2011-05-13 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11190 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.xls English https://www.ncdc.noaa.gov/paleo/study/11190 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2005/weldeab2005.xls Weldeab, S., R.R. Schneider, M. Kölling, and G. Wefer. 2005. Holocene African droughts relate to eastern equatorial Atlantic cooling. Geology, Vol. 33, no. 12, pp. 981-984. doi: 10.1130/G21874.1 START YEAR: 21770 cal yr BP * END YEAR: 60 cal yr BP 9.384 2.5 9.384 2.5