# Duncan Island, Hood Island, Isabela Island - Radiocarbon Data #---------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #---------------------------------------------------- # 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 # # Data lines have no # # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/1906 # 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-1906.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: 10.25921/ksc1-p173 # # Science_Keywords: #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/coral/east_pacific/hood1981-noaa.txt # Data_Download_Description: NOAA Template File; Samples CHI6 and CHI7 Radiocarbon Data # #-------------------- # Contribution_Date # Date: 2004-12-01 #-------------------- # File_Last_Modified_Date # Date: 2025-07-11 #-------------------- # Title # Study_Name: Duncan Island, Hood Island, Isabela Island - Radiocarbon Data #-------------------- # Investigators # Investigators: Druffel, E.R.M.(https://orcid.org/0000-0002-7139-1075) #-------------------- # Description_Notes_and_Keywords # Description: Radiocarbon data from annually banded corals in the Galapagos Islands, eastern tropical Pacific. #-------------------- # Publication # Authors: Druffel, E.R.M. # Journal_Name: Geophysical Research Letters # Published_Title: Radiocarbon in annual coral rings from the eastern tropical Pacific Ocean # Published_Date_or_Year: 1981 # Volume: 8 # Issue: 1 # Pages: 59-62 # Report_Number: # DOI: 10.1029/GL008i001p00059 # Full_Citation: # Abstract: Sixty radiocarbon measurements were performed on aragonite from annually banded corals collected from three sites in the Galápagos Islands. Preanthropogenic Δ14C values of coral that grew around A.D. 1930 averaged −70‰. This is substantially lower than average values previously reported (−51‰) for corals from Florida and Belize in the western North Atlantic Ocean. A decrease of 6‰ was noticed in coral that grew from 1930 to 1954. This decrease could be interpreted as a Suess effect in surface ocean water. The 100‰ increase in Δ14C for coral that grew from 1954 to 1973 is the result of bomb-produced 14C that was introduced to the surface ocean waters. The 14C levels in corals that grew during El Niño years were considerably higher than those for normal years. These higher values are attributed to the absence of up welling at the equator during El Niño events. #-------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-7917652, EAR-78-15183 #-------------------- # Site_Information # Site_Name: Hood Island # Location: Galapagos Islands # Northernmost_Latitude: -1.33 # Southernmost_Latitude: -1.33 # Easternmost_Longitude: -89.75 # Westernmost_Longitude: -89.75 # Elevation_m: #-------------------- # Data_Collection # Collection_Name: Hood Island Cores CHI6 and CHI7 # First_Year: 1961 # Last_Year: 1976 # Time_Unit: CE # Core_Length_m: # Parameter_Keywords: del14C # Notes: Collected February 1976 by P. Glynn and G. Wellington #-------------------- # 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) # ## samp_id sample identification,,,,,corals and sclerosponges,,,C,LJ number ## Station notes,,,,,corals and sclerosponges,,,C,Station (coral) number ## age_CE age,,,year Common Era,,corals and sclerosponges,,,N,± 0.3yrs ## D14C Delta 14C,Pavona clavus,,per mil NBS oxalic acid,,corals and sclerosponges,corrected,beta-particle spectroscopy,N,corrected for a delta 13C of -25 per mil PDB and for decay since the time of formation (Stuiver and Polach 1977) ## D14C_1s Delta 14C,Pavona clavus,one standard deviation,per mil NBS oxalic acid,,corals and sclerosponges,corrected,beta-particle spectroscopy,N,corrected for a delta 13C of -25 per mil PDB and for decay since the time of formation (Stuiver and Polach 1977) #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: samp_id Station age_CE D14C D14C_1s 4440 6 1961.5 -59 9 4435 6 1962.5 -51 8 4438 6 1963.5 -44 8 4441 6 1964.5 -24 6 4349 6 1965.5 -5 3 4346 6 1966.5 -25 3 4434 6 1967.5 1 3 4437 7 1968.5 13 5 4351 6 1969.5 31 4 4598 7 1969.2 36 4 4595 7 1969.8 11 4 4345 6 1970.5 18 4 4597 7 1970.5 21 4 4347 6 1971.5 25 4 4639 7 1971.5 30 3 4350 6 1972.5 48 3 4638 7 1972.2 28 3 4636 7 1972.8 32 4 4439 9 1973.5 16 6 4634 7 1973.5 17 5 4436 6 1974.5 17 5 4593 7 1974.2 17 4 4596 7 1974.8 20 4 4348 6 1975.5 39 4 4594 7 1976.0 26 3