# Indopacific Porites coral Li/Ca, B/Ca, Mg/Ca, Sr/Ca, Ba/Ca, U/Ca, and d11B data, 1994-2010 #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/21710 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/coral/multiregion/decarlo2016/decarlo2016-uchelbeluu221.txt # # Archive: Corals and Sclerosponges # # Parameter_Keywords: trace metals #--------------------------------------- # Contribution_Date # Date: 2017-03-22 #--------------------------------------- # Title # Study_Name: Indopacific Porites coral Li/Ca, B/Ca, Mg/Ca, Sr/Ca, Ba/Ca, U/Ca, and d11B data, 1994-2010 #--------------------------------------- # Investigators # Investigators: DeCarlo, Thomas; Gaetani, Glenn; Cohen, Anne; Foster, Gavin; Alpert, Alice; Stewart, Joseph #--------------------------------------- # Description and Notes # Description: Measurement Precision- Mg/Ca 0.05 mmol/mol; Sr/Ca 0.04 mmol/mol; Ba/Ca 0.03 µmol/mol; U/Ca 0.01 µmol/mol; Li/Ca 0.27 µmol/mol; B/Ca 4 µmol/mol; d11B 0.21 per mil SRM 951. # Provided Keywords: Porites, coral, Sr-U #--------------------------------------- # Publication # Authors: DeCarlo, T.M., G.A. Gaetani, A.L. Cohen, G.L. Foster, A.E. Alpert, and J.A. Stewart # Published_Date_or_Year: 2016 # Published_Title: Coral Sr-U thermometry # Journal_Name: Paleoceanography # Volume: 31 # Edition: # Issue: # Pages: 626-638 # Report Number: # DOI: 10.1002/2015PA002908 # Online_Resource: # Full_Citation: # Abstract: Coral skeletons archive past climate variability with unrivaled temporal resolution. However, extraction of accurate temperature information from coral skeletons has been limited by “vital effects,” which confound, and sometimes override, the temperature dependence of geochemical proxies. We present a new approach to coral paleothermometry based on results of abiogenic precipitation experiments interpreted within a framework provided by a quantitative model of the coral biomineralization process. DeCarlo et al. (2015a) investigated temperature and carbonate chemistry controls on abiogenic partitioning of Sr/Ca and U/Ca between aragonite and seawater and modeled the sensitivity of skeletal composition to processes occurring at the site of calcification. The model predicts that temperature can be accurately reconstructed from coral skeleton by combining Sr/Ca and U/Ca ratios into a new proxy, which we refer to hereafter as the Sr-U thermometer. Here we test the model predictions with measured Sr/Ca and U/Ca ratios of 14 Porites sp. corals collected from the tropical Pacific Ocean and the Red Sea, with a subset also analyzed using the boron isotope (d11B) pH proxy. Observed relationships among Sr/Ca, U/Ca, and d11B agree with model predictions, indicating that the model accounts for the key features of the coral biomineralization process. By calibrating to instrumental temperature records, we show that Sr-U captures 93% of mean annual temperature variability (26–30°C) and has a standard deviation of prediction of 0.5°C, compared to 1°C using Sr/Ca alone. The Sr-U thermometer may offer significantly improved reliability for reconstructing past ocean temperatures from coral skeletons. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: U.S. National Science Foundation # Grant: OCE-1338320 #--------------------------------------- # Site Information # Site_Name: Uchelbeluu # Location: Western Pacific Ocean # Country: Palau # Northernmost_Latitude: 7.267 # Southernmost_Latitude: 7.267 # Easternmost_Longitude: 134.521 # Westernmost_Longitude: 134.521 # Elevation: -5 #--------------------------------------- # Data_Collection # Collection_Name: Uchelbeluu221 DeCarlo16 # First_Year: 2008 # Last_Year: 2010 # Time_Unit: AD # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## Age_AD age,,,years AD,,,,,N ## Li_Ca Lithium/Calcium,Porites spp. Skeleton,0.27,µmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## B_Ca Boron/Calcium,Porites spp. Skeleton,4,µmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## Mg_Ca Magnesium/Calcium,Porites spp. Skeleton,0.05,mmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## Sr_Ca Strontium/Calcium,Porites spp. Skeleton,0.04,mmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## Ba_Ca Barium/Calcium,Porites spp. Skeleton,0.03,µmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## U_Ca Uranium/Calcium,Porites spp. Skeleton,0.01,µmol/mol,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N ## d11B d11B,Porites spp. Skeleton,0.21,per mil SRM 951,,Coral and Sclerosponge,,analytical technique: isotope ratio mass spectrometry,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: -999 Age_AD Li_Ca B_Ca Mg_Ca Sr_Ca Ba_Ca U_Ca d11B 2010.00 4.52 346 4.38 8.68 2.30 1.01 23.98 2009.83 4.38 340 4.47 8.68 2.33 1.00 23.75 2009.67 4.45 343 6.92 8.54 2.68 0.96 24.13 2009.50 4.50 342 4.67 8.63 2.17 0.98 23.75 2009.33 4.41 349 4.54 8.65 2.53 0.96 23.48 2009.17 4.95 372 4.48 8.70 3.09 0.97 23.46 2009.00 4.60 347 4.74 8.62 2.41 0.93 23.56 2008.83 4.72 358 4.68 8.63 2.85 0.96 23.66 2008.67 4.61 352 4.80 8.67 2.59 0.96 23.69 2008.50 4.59 343 4.48 8.69 2.86 0.97 23.49 2008.33 4.77 372 4.59 8.67 2.17 0.94 24.11 2008.17 4.59 359 4.47 8.71 1.79 1.00 24.03 2008.00 4.74 362 4.51 8.66 2.08 0.96 23.66