Deep Sea Coral Global Boron Isotope Data Anagnostou, E.; Huang, K.-F.; You, C.-F.; Sikes, E.L.; Sherrell, R.M. Anagnostou, E. Huang, K.-F. You, C.-F. Sikes, E.L. Sherrell, R.M. earth science/paleoclimate/corals and sclerosponges (sample identification,null,null,null,null,corals and sclerosponges,null,null,C,null) earth science/paleoclimate/corals and sclerosponges (delta 11B,Desmophyllum dianthus,range,per mil SRM 951,null,corals and sclerosponges,averaged,multiple collector inductively-coupled plasma mass spectrometry,N,2*d11B range about the mean) earth science/paleoclimate/instrumental (pH,sea water,null,dimensionless,null,instrumental,null,null,N,null) earth science/paleoclimate/instrumental (pH,sea water,unspecified margin of error,dimensionless,null,instrumental,null,null,N,null) earth science/paleoclimate/instrumental (dissociation constant,sea water,null,dimensionless,null,instrumental,null,null,N,for boric acid and borate ion) earth science/paleoclimate/instrumental (delta 11B,borate ion|sea water,null,per mil,null,instrumental,null,null,N,measured on seawater borate ion) earth science/paleoclimate/instrumental (aragonite saturation state,sea water,null,dimensionless,null,instrumental,null,null,N,null) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (pH,delta 11B|sea water,range,dimensionless,null,climate reconstructions|corals and sclerosponges,differenced,null,N,based on 2*d11B range about the mean) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (collection water depth,null,null,meter,null,climate reconstructions|corals and sclerosponges,null,null,N,collection depth of corals) earth science/paleoclimate/corals and sclerosponges (delta 11B,Desmophyllum dianthus,null,per mil SRM 951,null,corals and sclerosponges,averaged,multiple collector inductively-coupled plasma mass spectrometry,N,average of replicate boron isotope measurements in coral skeleton) earth science/paleoclimate/corals and sclerosponges (collection date,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Year of coral collection) earth science/paleoclimate/corals and sclerosponges (weight,Desmophyllum dianthus,null,milligram,null,corals and sclerosponges,null,null,N,coralsubsample weight use for boron isotope analysis) earth science/paleoclimate/corals and sclerosponges (delta 11B,Desmophyllum dianthus,null,per mil SRM 951,null,corals and sclerosponges,averaged,multiple collector inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (delta 11B,Desmophyllum dianthus,null,per mil SRM 951,null,corals and sclerosponges,differenced,multiple collector inductively-coupled plasma mass spectrometry,N,offset in boron isotopes in coral skeleton replicates) earth science/paleoclimate/instrumental (salinity,sea water,null,practical salinity unit,null,instrumental,null,null,N,null) earth science/paleoclimate/instrumental (alkalinity,sea water,null,microequivalent per kilogram,null,instrumental,null,null,N,null) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (pH,delta 11B|sea water,null,dimensionless,null,climate reconstructions|corals and sclerosponges,differenced,null,N,pH indicated by d11B minus pH In seawater) earth science/paleoclimate/corals and sclerosponges (weight,Desmophyllum dianthus,null,milligram,null,corals and sclerosponges,null,null,N,mass of resampled coral; when no mass is indicated but values are reported they refer to subsampling of the initial solid aliquot or replicate of dissolved sample) earth science/paleoclimate/instrumental (sea water temperature,null,null,degree Celsius,null,instrumental,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (sample identification,null,null,null,null,corals and sclerosponges,null,null,C,Hydrographic section number from WOCE program) earth science/paleoclimate/corals and sclerosponges (sample identification,null,null,null,null,corals and sclerosponges,null,null,C,hydrographic station number on WOCE section) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (latitude,null,null,degree north,null,climate reconstructions|corals and sclerosponges,null,null,N,null) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (longitude,null,null,degree east,null,climate reconstructions|corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (collection date,null,null,year Common Era,null,corals and sclerosponges,null,null,N,year hydrographic data collected) earth science/paleoclimate/instrumental (dissolved inorganic carbon,sea water,null,micromole per kilogram,null,instrumental,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (Global>LATITUDE >LONGITUDE ) The boron isotope ratio (d11B) of foraminifers and tropical corals has been proposed to record seawater pH. To test the veracity and practicality of this potential paleo-pH proxy in deep sea corals, samples of skeletal material from twelve archived modern Desmophyllum dianthus (D. dianthus) corals from a depth range of 274-1470 m in the Atlantic, Pacific, and Southern Oceans, ambient pH range 7.57-8.05, were analyzed for d11B. The d11B values for these corals, spanning a range from 23.56 to 27.88, are found to be related to seawater borate d11B by the linear regression: d11Bcoral=(0.76+/-0.28) d11Bborate+(14.67+/-4.19) (1 standard error (SE)). The D. dianthus d11B values are greater than those measured in tropical corals, and suggest substantial physiological modification of pH in the calcifying space by a value that is an inverse function of seawater pH. This mechanism partially compensates for the range of ocean pH and aragonite saturation at which this species grows, enhancing aragonite precipitation and suggesting an adaptation mechanism to low pH environments in intermediate and deep waters. Consistent with the findings of Trotter et al. (2011) for tropical surface corals, the data suggest an inverse correlation between the magnitude of a biologically driven pH offset recorded in the coral skeleton, and the seawater pH, described by the equation: DpH=pH recorded by coral-seawater pH=-(0.75+/-0.12) pHw+(6.88+/-0.93) (1 SE). Error analysis based on 95% confidence interval(CI) and the standard deviation of the regression residuals suggests that the uncertainty of seawater pH reconstructed from d11Bcoral is +/-0.07 to 0.12 pH units. This study demonstrates the applicability of d11B in D. dianthus to record ambient seawater pH and holds promise for reconstructing oceanic pH distribution and history using fossil corals. STUDY NOTES: Calibration of boron isotopes in the deep-sea coral Desmophyllum dianthus NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Anagnostou, E. Investigator : Huang, K.-F. Investigator : You, C.-F. Investigator : Sikes, E.L. Investigator : Sherrell, R.M. 2016-07-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20348 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/anagnostou2012boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/anagnostou2012boron.txt English https://www.ncdc.noaa.gov/paleo/study/20348 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/anagnostou2012boron.txt E. Anagnostou, K.-F. Huang, C.-F. You, E.L. Sikes, R.M. Sherrell2012Evaluation of boron isotope ratio as a pH proxy in the deep sea coral Desmophyllum dianthus: Evidence of physiological pH adjustmentEarth and Planetary Science Letters349-350251-26010.1016/j.epsl.2012.07.006 START YEAR: 1888 AD * END YEAR: 1999 AD -180 -90 180 90