Amedee Lighthouse - Elemental Ratios, Isotope, and SST Calibration Data Quinn, T.M.; Sampson, D.S. Quinn, T.M. Sampson, D.S. earth science/paleoclimate/corals and sclerosponges (strontium/calcium,Porites lutea,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (uranium/calcium,Porites lutea,null,micromole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (barium/calcium,Porites lutea,null,micromole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (magnesium/calcium,Porites lutea,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/instrumental (sea surface temperature,null,null,degree Celsius,null,instrumental,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (delta 13C,Porites lutea,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (delta 18O,Porites lutea,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (notes,null,null,null,null,corals and sclerosponges,null,null,C,null) earth science/paleoclimate/instrumental (sea surface temperature,null,null,degree Celsius,null,instrumental,null,null,N,in situ data logger) earth science/paleoclimate/instrumental (salinity,sea surface,null,parts per thousand,null,instrumental,null,null,N,in situ data logger) earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges (Amedee Lighthouse>LATITUDE -22.48>LONGITUDE 166.47) We use elemental ratio (Mg/Ca, Sr/Ca, U/Ca and Ba/Ca) and oxygen isotope data from a Porites lutea coral head collected from offshore Amédée Island, New Caledonia (22°29S, 166°28E) to assess the degree to which changes in these geochemical variables reflect variations in sea surface conditions. We have assessed the robustness of each geochemical proxy by comparing 25 years (1992ŋ1968) of monthly geochemical variations with a local record of sea surface temperature (SST) and with the appropriate 1° by 1° grid box from a global gridded SST data set. We conclude from our comparison that the most consistent proxies of monthly SST variations at this site are d18O (r2 = -0.84; p = <.0001) and Sr/Ca (r2 = -0.84; p = <.0001). The fidelity of the coral-based Sr/Ca-SST proxy was assessed via calibration-verification exercises at New Caledonia and Rarotonga. The ŋpaleoclimateŋ accuracy of the coral Sr/Ca-SST technique is judged to be robust, and the precision of the technique is estimated to be ~0.3° ą 0.5 (2) based on the calibration-verification exercise. In contrast, monthly variations in Mg/Ca and U/Ca ratios are only moderately correlated with monthly SST variations (r2 = 0.55; p = <.0001 for Mg/Ca and r2 = 0.47; p = <.0001). The strength of the correlation between SST and Mg/Ca and U/Ca varies as a function of time, suggesting that variations in these ratios are not a simple function of SST variations. This variability in goodness of fit between U/Ca-SST and Mg/Ca-SST may ultimately limit the use of these ratios as coral paleothermometers. Averaging or stacking individual proxy SST records (Sr/Ca, Mg/Ca and U/Ca) to generate a composite proxy SST record does not necessarily improve the proxy record if the signal-to-noise ratio in each proxy is highly variable. For example, stacking of Sr/Ca-Mg/Ca-U/Ca records at New Caledonia produces a proxy SST time series that has greater standard error than the individual Sr/Ca-SST time series (cf. ordinary least squares standard error of 1.16°C versus 0.86°C). Ba/Ca variations have little correlation with SST, Sr/Ca, Mg/Ca, or U/Ca variations at New Caledonia. In conclusion, variations in oxygen isotopic composition of seawater, calculated by removing the Sr/Ca-based temperature component of the d18O signal, agree reasonably well with observed variations in sea surface salinity, especially at the interannual timescale. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Quinn, T.M. Investigator : Sampson, D.S. 2002-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/1877 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002-inst_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002-inst_noaa.txt English https://www.ncdc.noaa.gov/paleo/study/1877 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002-inst_noaa.txt Quinn, T.M., and D.S. Sampson. 2002. A multi-proxy approach to reconstructing sea-surface conditions using coral skeleton geochemistry. Paleoceanography 17(4):1062. START YEAR: 1968 AD * END YEAR: 1992 AD 166.47 -22.48 166.47 -22.48