noaa-ocean-22277 Central and Southern Atlantic Ocean benthic foraminiferal Mg/Ca, DCO2-3 and BWT Data from core top samples Weldeab, S.; Arce, A.; Kasten, S. Central and Southern Atlantic Ocean benthic foraminiferal Mg/Ca, DCO2-3 and BWT Data from core top samples 2017-06-26 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22277 Investigator S. Weldeab Investigator A. Arce Investigator S. Kasten earth science paleoclimate climate reconstructions|paleoceanography depth at sample end,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography depth at sample start,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate instrumental carbonate ion,sea water,null,micromole per kilogram,null,instrumental,anomalized,null,N,0 cm sediment depth; the difference between in situ and saturation values (Delta CO2-3) earth science paleoclimate instrumental carbonate ion,sediment pore water,null,micromole per kilogram,null,instrumental,anomalized,null,N,0-10 cm sediment depth; the difference between in situ and saturation values (Delta CO2-3) earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,core name earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate instrumental carbonate ion,sediment pore water,null,micromole per kilogram,null,instrumental,anomalized,null,N,1-10 cm sediment depth; the difference between in situ and saturation values (Delta CO2-3) earth science paleoclimate instrumental|paleoceanography longitude,null,null,degree east,null,instrumental|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography longitude,null,null,degree east,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography collection water depth,null,null,meter,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography magnesium/calcium,benthic foraminifer,null,millimole per mole,null,paleoceanography,null,null,N,Globobulimina spp. earth science paleoclimate climate reconstructions|paleoceanography sample identification,null,null,null,null,climate reconstructions|paleoceanography,null,null,C,core name earth science paleoclimate instrumental carbonate ion,null,null,micromole per kilogram,null,instrumental,anomalized,null,N,deviation from average Delta CO3-2 values earth science paleoclimate instrumental|paleoceanography latitude,null,null,degree north,null,instrumental|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography notes,null,null,null,null,climate reconstructions|paleoceanography,null,null,C,species measured earth science paleoclimate climate reconstructions|paleoceanography latitude,null,null,degree north,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,bottom water; Calculated using Mg/Ca[mmol/mol]?=?(0.36?±?0.02)*BWT[°C]?+?2.22?±?0.19; r-squared=0.92 earth science paleoclimate instrumental|paleoceanography collection water depth,null,null,meter,null,instrumental|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 earth science paleoclimate paleocean reconstruction geoscientificInformation Other Reconstruction Complete -44.455 30.1933 -54.2583 14.005 Ocean Atlantic Ocean Central and Southern Atlantic Ocean>LATITUDE >LONGITUDE Ocean Atlantic Ocean Gulf of Guinea>LATITUDE >LONGITUDE 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 Weldeab, S., A. Arce, and S. Kasten 2016 Earth and Planetary Science Letters 438 95-102 10.1016/j.epsl.2016.01.009

Existing benthic foraminiferal Mg/Ca-temperature calibrations are surrounded by substantial uncertainties mainly due to low temperature sensitivity of Mg/Ca in most benthic foraminifers and the effect of carbonate ion concentration on benthic foraminiferal Mg/Ca. Here we present Mg/Ca analysis of Rose Bengal stained and exceptionally well-preserved tests of the infaunal benthic foraminifer Globobulimina spp. from 39 eastern equatorial Atlantic core top samples. Mg/Ca in Globobulimina spp. varies between 2.5 mmol/mol and 9.1 mmol/mol corresponding to bottom water temperatures (BWT) between 1.8? and 19.1? and ??CO?_(3 pore water)^(2-) between 33.7±4 and -34.3±4 µmol/kg in sediment depths between 1 and 10 cm. Mg/Ca and BWT are linearly correlated with a best fit of Mg/Ca[mmol/mol]=(0.36±0.02)*BWT[°C]+2.22±0.19 (r2=0.92, p: 11*10-20, and n=39). Using total alkalinity and pH data of pore water samples from 64 Atlantic multi-corer sites, we obtained ??CO?_(3 pore water)^(2-)data from the depth habitat range of Globobulimina spp. (= 1 cm = 10 cm below sediment surface). We show that ??CO?_(3 pore water)^(2-) is significantly lower than and linearly co-varies with the ??CO?_3^(2-) of the overlying bottom water: ??CO?_(3 pore water)^(2-)=(0.67±0.05)*??CO?_(3 bottom water)^(2-)-(39.84±1.98); r2=0.75, p: 6*10-20, n=64. We found a Mg/Ca sensitivity of 0.009±0.0044 mmol/mol per µmol/kg ??CO?_(3 pore water)^(2-) and Mg/Ca temperature sensitivity of 0.32 ±0.06 mmol/mol/°C after a correction for the ??CO?_(3 pore water)^(2-) effect. This study provides a robust Mg/Ca-temperature calibration, highlights that ??CO?_(3 pore water)^(2-) is spatially and most likely temporally variable, and contradicts the notion that infaunal foraminiferal Mg/Ca is relatively immune from ??CO?_(3 )^(2-) changes in the overlying bottom water. Furthermore, comparison of down core Mg/Ca data of Cibicides pachyderma and Globobulimina spp. demonstrates that the high temperature sensitivity of Mg/Ca in Globobulimina spp. presents a more robust paleothermometer to reconstruct past changes in the thermal state of the deep ocean. STUDY NOTES: Benthic foramineral Mg/Ca-temperature calibration using Rose Bengel stained core top samples Provided Keywords: pore water chemistry, bottom water calibration

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2016-epsl/weldeab2016-epsl-bwt.txt NOAA Template File; Mg/Ca and BWT Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2016-epsl/weldeab2016-epsl-dco23pore.txt NOAA Template File; DCO2-3 pore water Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2016-epsl/weldeab2016-epsl-dco23-bw.txt NOAA Template File; DCO2-3 bottom water Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11