noaa-ocean-23110 Global sediment trap calibration of Mg/Ca in G. ruber white, with associated temperature, salinity and carbonate system data Gray, W.R.; Weldeab, S.; Lea, D.W.; Rosenthal, Y.; Gruber, N.; Donner, B.; Fischer, G. Global sediment trap calibration of Mg/Ca in G. ruber white, with associated temperature, salinity and carbonate system data 2017-11-16 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23110 Investigator W.R. Gray Investigator S. Weldeab Investigator D.W. Lea Investigator Y. Rosenthal Investigator N. Gruber Investigator B. Donner Investigator G. Fischer earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,morphotype of G. ruber analysed; m = mixed; ss = sensustricto; sl = sensu lato earth science paleoclimate instrumental sea surface temperature,null,one standard deviation,degree Celsius,null,instrumental,null,null,N,Climatological temperature (0-50m depth) associated with each trap/tow sample; WOA13 extrapolation - see Gray et al. 2018 for details earth science paleoclimate instrumental pH,sea water,one standard deviation,dimensionless,null,instrumental,null,null,N,pH (0-50m depth) associated with each trap/tow sample; seawater scale; see Gray et al. 2018 earth science paleoclimate instrumental|paleoceanography collection date,null,null,day of year,null,instrumental|paleoceanography,null,null,N,end date represented by trap sample cup or plankton tow earth science paleoclimate paleoceanography diameter,Globigerinoides ruber white,null,micrometer,null,paleoceanography,null,null,N,minimum test size earth science paleoclimate instrumental|paleoceanography sample identification,null,null,null,null,instrumental|paleoceanography,null,null,C,ID used in original publication earth science paleoclimate paleoceanography magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,all data are oxidatively cleaned and measured by solution ICP-MS/OES (see original publication - indicated by the 'trap_ref' variable - for details); the data of Huang et al. earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,descriptive location of sediment trap/plankton tow earth science paleoclimate instrumental salinity,sea water,null,practical salinity unit,null,instrumental,null,null,N,Climatological salinity (0-50m depth) associated with each trap/tow sample; WOA13 extrapolation - see Gray et al. 2018 for details earth science paleoclimate instrumental carbonate ion,sea water,one standard deviation,micromole per kilogram,null,instrumental,null,null,N,carbonate ion concentration (0-50m depth) associated with each trap/tow sample; see Gray et al. 2018 earth science paleoclimate instrumental|paleoceanography longitude,null,null,degree east,null,instrumental|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography diameter,Globigerinoides ruber white,null,micrometer,null,paleoceanography,null,null,N,maximum test size earth science paleoclimate instrumental carbonate ion,sea water,null,micromole per kilogram,null,instrumental,null,null,N,carbonate ion concentration (0-50m depth) associated with each trap/tow sample; see Gray et al. 2018 earth science paleoclimate instrumental sea surface temperature,null,null,degree Celsius,null,instrumental,null,null,N,Climatological temperature (0-50m depth) associated with each trap/tow sample; WOA13 extrapolation - see Gray et al. 2018 for details earth science paleoclimate instrumental|paleoceanography latitude,null,null,degree north,null,instrumental|paleoceanography,null,null,N,null earth science paleoclimate instrumental|paleoceanography collection date,null,null,day of year,null,instrumental|paleoceanography,null,null,N,start date represented by trap sample cup or plankton tow earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,reference for Mg/Ca data earth science paleoclimate instrumental salinity,sea water,one standard deviation,practical salinity unit,null,instrumental,null,null,N,Climatological salinity (0-50m depth) associated with each trap/tow sample; WOA13 extrapolation - see Gray et al. 2018 for details earth science paleoclimate instrumental pH,sea water,null,dimensionless,null,instrumental,null,null,N,pH (0-50m depth) associated with each trap/tow sample; seawater scale; see Gray et al. 2018 earth science paleoclimate paleocean trace metals in carbonates geoscientificInformation 1978 AD 2006 AD -28 cal yr BP -56 cal yr BP Complete -16.2 32.1 -111.7 134.3 Geographic Region Global Ocean Atlantic, Pacific and Indian Tropical and Subtropical Ocean>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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Gray, W.R., S. Weldeab, D.W. Lea, Y. Rosenthal, N. Gruber, B. Donner, and G. Fischer 2018 Earth and Planetary Science Letters 482 607-620 10.1016/j.epsl.2017.11.026

The Mg/Ca of planktic foraminifera Globeriginoides ruber (white) is a widely applied proxy for tropical and sub-tropical sea-surface temperature. The accuracy with which temperature can be reconstructed depends on how accurately relationships between Mg/Ca and temperature and the multiple secondary controls on Mg/Ca are known; however, these relationships remain poorly quantified under oceanic conditions. Here, we present new calibrations based on 440 sediment trap/plankton tow samples from the Atlantic, Pacific and Indian Oceans, including 130 new samples from the Bay of Bengal/Arabian Sea and the tropical Atlantic Ocean. Our results indicate temperature, salinity and the carbonate system all significantly influence Mg/Ca in G. ruber (white). We propose two calibration models: The first model assumes pH is the controlling carbonate system parameter. In this model, Mg/Ca has a temperature sensitivity of 6.0±0.8 %/°C (2s), a salinity sensitivity of 3.3±2.2 %/PSU and a pH sensitivity of -8.3±7.7 %/0.1 pH units; The second model assumes carbonate ion concentration ([CO32-]) is the controlling carbonate system parameter. In this model, Mg/Ca has a temperature sensitivity of 6.7±0.8 %/°C, a salinity sensitivity of 5.0±3.0 %/PSU and a [CO32-] sensitivity of -0.24±0.11 %/µmol kg-1. In both models, the temperature sensitivity is significantly lower than the widely-applied sensitivity of 9.0±0.6 %/°C. Application of our new calibrations to down-core data from the Last Glacial Maximum, considering whole ocean changes in salinity and carbonate chemistry, indicate a cooling of 2.4±1.6 °C in the tropical oceans if pH is the controlling parameter and 1.5±1.4 °C if [CO32-] is the controlling parameter.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gray2018/gray2018-mgca.txt NOAA Template File; Global Mg/Ca G.ruber Calibration Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11