Eocene-Oligocene Benthic Foraminifer B/Ca Calibration Data Brown, R.E.; Anderson, L.D.; Thomas, E.; Zachos, J.C. Brown, R.E. Anderson, L.D. Thomas, E. Zachos, J.C. carbon cycle earth science/paleoclimate/paleoceanography (boron/calcium,Nuttallides umbonifera,null,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/instrumental (pH,sea water,null,dimensionless,null,instrumental,null,null,N,null) earth science/paleoclimate/instrumental (carbonate ion,sea water,null,micromole per kilogram,null,instrumental,null,null,N,D[CO32-]) earth science/paleoclimate/instrumental (temperature,sea water,null,degree Celsius,null,instrumental,null,null,N,bottom water temperature from the GLODAP and CARINA data set) earth science/paleoclimate/paleoceanography (longitude,null,null,degree east,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Nuttallides umbonifera,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Nuttallides umbonifera,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,Cibicidoides wuellerstorfi,null,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,Oridorsalis umbonatus,one standard deviation,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (collection water depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,sample depth) earth science/paleoclimate/instrumental (inorganic compound index,sea water,null,dimensionless,null,instrumental,null,null,N,B(OH)4-/HCO3-) earth science/paleoclimate/instrumental (boron,sea water,null,micromole per kilogram,null,instrumental,null,null,N,null) earth science/paleoclimate/paleoceanography (latitude,null,null,degree north,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,Nuttallides umbonifera,one standard deviation,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,Cibicidoides wuellerstorfi,one standard deviation,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,Oridorsalis umbonatus,null,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 690B>LATITUDE -65.16>LONGITUDE 1.2) (ODP 689B>LATITUDE -64.517>LONGITUDE 3.0999) (ODP 1262>LATITUDE -27.186>LONGITUDE 1.577) We present modern B/Ca core-top calibrations for the epifaunal benthic foraminifer Nuttallides umbonifera and the infaunal Oridorsalis umbonatus to test whether B/Ca values in these species can be used for the reconstruction of paleo-D[CO32-]. O. umbonatus originated in the Late Cretaceous and remains extant, whereas N. umbonifera originated in the Eocene and is the closest extant relative to Nuttallides truempyi, which ranges from the Late Cretaceous through the Eocene. We measured B/Ca in both species in 35 Holocene sediment samples from the Atlantic, Pacific and Southern Oceans. B/Ca values in epifaunal N. umbonifera (~85-175 umol/mol) are consistently lower than values reported for epifaunal Cibicidoides (Cibicides) wuellerstorfi (130-250 umol/mol), though the sensitivity of D[CO32-] on B/Ca in N.umbonifera (1.23±0.15) is similar to that in C. wuellerstorfi (1.14±0.048). In addition, we show that B/Ca values of paired N. umbonifera and its extinct ancestor, N. truempyi, from Eocene cores are indistinguishable within error. In contrast, both the B/Ca (35-85 umol/mol) and sensitivity to D[CO32-] (0.29±0.20) of core-top O. umbonatus are considerably lower (as in other infaunal species), and this offset extends into the Paleocene. Thus the B/Ca of N.umbonifera and its ancestor can be used to reconstruct bottom water D[CO32-], whereas O. umbonatus B/Ca appears to be buffered by porewater [CO32-] and suited for constraining long-term drift in seawater B/Ca. STUDY NOTES: Boron/Calcium data for benthic foraminifera from the Eocene-Oligocene of Ocean Drilling Program Sites 689, 690 (Maud Rise), and Site 1262 (Walvis Ridge). Analyses were carried out by ICPMS. ODP Site 689: 64°31.020'S, 3°5.994' E, 2080m water depth ODP Site 690: 65° 9.629'S, 1°12.296'E, 2914m water depth ODP Site 1262: 27°11.160'S, 1°34.620'E, 4755m water depth NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Brown, R.E. Investigator : Anderson, L.D. Investigator : Thomas, E. Investigator : Zachos, J.C. 2012-07-10 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13135 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.xls English https://www.ncdc.noaa.gov/paleo/study/13135 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brown2011/brown2011.xls Brown, R.E., L.D. Anderson, E. Thomas, and J.C. Zachos. 2011. A core-top calibration of B/Ca in the benthic foraminifers Nuttallides umbonifera and Oridorsalis umbonatus: A proxy for Cenozoic bottom water carbonate saturation. Earth and Planetary Science Letters, Vol. 310 pp. 360-368. doi:10.1016/j.epsl.2011.08.023 START YEAR: 44988000 cal yr BP * END YEAR: 34200000 cal yr BP 1.2 -65.16 3.0999 -27.186