# Palmyra Atoll Porites spp. d18O and Sr/Ca Data from 1982-2010 CE #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncdc.noaa.gov/paleo/study/34692 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-coral-34692.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Corals and Sclerosponges # # Dataset_DOI: # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/coral/central_pacific/sayani2019/sayani2019-pm1.txt # Data_Download_Description: NOAA Template File; PM1 d18O Sr/Ca Data # #--------------------------------------- # Contribution_Date # Date: 2021-11-05 #--------------------------------------- # File_Last_Modified_Date # Date: 2021-11-05 #--------------------------------------- # Title # Study_Name: Palmyra Atoll Porites spp. d18O and Sr/Ca Data from 1982-2010 CE #--------------------------------------- # Investigators # Investigators: Sayani, H. R.; Cobb, K. M.; DeLong, K.; Hitt, N. T.; Druffel, E. R. M. #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Sayani, H.R., Cobb, K.M., DeLong, K., Hitt, N.T., and Druffel, E.R.M. # Published_Date_or_Year: 2019 # Published_Title: Intercolony d18O and Sr/Ca variability among Porites spp. corals at Palmyra Atoll: Toward more robust coral-based estimates of climate # Journal_Name: Geochemistry,Geophysics, Geosystems # Volume: 20 # Edition: # Issue: 11 # Pages: 5270–5284 # Report_Number: # DOI: 10.1029/2019GC008420 # Online_Resource: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GC008420 # Full_Citation: # Abstract: Quantitative estimates of natural climate variability are required to detect anthropogenic climate trends in the tropical Pacific; however, instrumental records from this region are too short and scarce. Coral oxygen isotopic (d18O) and strontium to calcium (Sr/Ca) records are often used to extend instrumental observations; however, differences in the mean Sr/Ca and d18O values of Porites spp. colonies from the same reef can introduce large uncertainties in coral-based climate reconstructions. To quantify intercolony variability at Palmyra Atoll, we generate monthly resolved Sr/Ca and d18O time series from five Porites spp. colonies that grew between 1980 and 2010. Monthly to interannual variability in Sr/Ca and d18O is well-reproduced among different colonies; however, we document intercolony offsets in mean Sr/Ca of ±0.09 mmol/mol (1s) or ~1 °C, and in mean d18O of ±0.12‰ (1s) or ~0.1 °C. The sensitivity of each proxy to climate also varies across colonies, with Sr/Ca-SST slopes ranging from -0.06 to -0.1 mmol mol-1 °C-1 and d18O-SST slopes ranging from -0.25 to -0.35‰ °C-1. Intercolony variability in both coral Sr/Ca and d18O reduces the reproducibility of coral-based d18Osw reconstructions across overlapping colonies. Accounting for both intercolony variability and slope error suggests that SST reconstructions using Sr/Ca from a single Palmyra coral have an uncertainty of ±1.3 °C (1s); however, replicating Sr/Ca records across multiple colonies can greatly reduce this uncertainty. A composite Sr/Ca record built using five modern cores, for example, offers a reduced error of ±0.6 °C (1s) in mean SST reconstructions, ~2.5 times smaller than errors associated with reconstructions from single corals. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: Palmyra Atoll PM1 # Location: Ocean>Pacific Ocean>Central Pacific Ocean # Northernmost_Latitude: 5.878 # Southernmost_Latitude: 5.878 # Easternmost_Longitude: -162.142 # Westernmost_Longitude: -162.142 # Elevation_m: #--------------------------------------- # Data_Collection # Collection_Name: PM1 d18O Sr/Ca Sayani2019 # First_Year: 1982 # Last_Year: 1998 # Time_Unit: year Common Era # Core_Length_m: # Parameter_Keywords: oxygen isotopes, trace metals # Notes: This dataset contains coral oxygen isotope (d18O) and Sr/Ca data from a modern Porites sp. core recovered in May 1998 from a colony near the center of Palmyra's western reef terrace at an unrecorded depth of <10 m. #--------------------------------------- # Species # Species_Name: # Common_Name: # Tree_Species_Code: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## age age,,,year Common Era,,corals and sclerosponges,,,N, ## Sr/Ca strontium/calcium,Porites sp.,,millimole per mole,,corals and sclerosponges,,inductively-coupled plasma atomic emission spectroscopy,N, ## d18O delta 18O,Porites sp.,,per mil VPDB,,corals and sclerosponges,,isotope ratio mass spectrometry,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN age Sr/Ca d18O 1998 9.009227 NaN 1997.932692 8.985624 NaN 1997.865385 8.976155 NaN 1997.798077 9.019262 -5.47167 1997.730769 9.004064 -5.50167 1997.663462 8.973955 -5.442723 1997.596154 8.937473 -5.521038 1997.528846 8.99656 -5.636643 1997.461538 8.936815 -5.529848 1997.394231 9.009905 -5.374512 1997.326923 9.003355 -5.269534 1997.259615 8.98683 -4.909255 1997.192308 9.056149 -5.083932 1997.125 9.063263 -5.111925 1997.079167 9.021311 -5.075194 1997.033333 9.035481 -5.067083 1996.9875 9.010955 -5.071239 1996.941667 9.022624 -5.179657 1996.895833 8.975245 -5.318509 1996.85 8.93726 -5.351291 1996.804167 9.03845 -5.313605 1996.758333 9.018241 -5.332781 1996.7125 9.058644 -5.27052 1996.666667 9.025192 -5.268068 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1982.248012 9.024362 NaN 1982.206842 9.065576 NaN 1982.165673 9.064637 NaN 1982.124503 9.074453 NaN 1982.083333 9.129585 NaN 1982.016666 9.105752 NaN