# Greenland Ice Core (GICC05) and Radiocarbon (IntCal13) Holocene Timescale Differences #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 2.0 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/21092 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gicc05adolphi2016.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Cores, tree-rings # # Parameter_Keywords: age control, radiogenic isotopes #-------------------- # Contribution_Date # Date: 2016-12-21 #-------------------- # Title # Study_Name: Greenland Ice Core (GICC05) and Radiocarbon (IntCal13) Holocene Timescale Differences #-------------------- # Investigators # Investigators: Adolphi, F.; Muscherler, R. #-------------------- # Description_Notes_and_Keywords # Description: # Greenland ice core timescale (GICC05) and tree-ring based radiocarbon calibration timescale (IntCal13) timescale differences over the Holocene. # The differences have been inferred by synchronizing GRIP/GISP2 ice core 10Be measurements to absolutely dated tree-ring 14C records. # Hence, this synchronization allows a direct comparison of ice core and radiocarbon dated climate records circumventing ice core timescale uncertainties. #-------------------- # Publication # Authors: Adolphi, F. and R. Muscheler # Published_Date_or_Year: 2016-01-15 # Published_Title: Synchronizing the Greenland ice core and radiocarbon timescales over the Holocene - Bayesian wiggle-matching of cosmogenic radionuclide records # Journal_Name: Climate of the Past # Volume: 12 # Edition: # Issue: 1 # Pages: 15-30 # Report_Number: # DOI: 10.5194/cp-12-15-2016 # Online_Resource: http://www.clim-past.net/12/15/2016/ # Full_Citation: # Abstract: Investigations of past climate dynamics rely on accurate and precise chronologies of the employed climate reconstructions. The radiocarbon dating calibration curve (IntCal13) and the Greenland ice core chronology (GICC05) represent two of the most widely used chronological frameworks in paleoclimatology of the past ~50,000 years. However, comparisons of climate records anchored on these chronologies are hampered by the precision and accuracy of both timescales. Here we use common variations in the production rates of 14C and 10Be recorded in tree-rings and ice cores, respectively, to assess the differences between both timescales during the Holocene. Compared to earlier work, we employ a novel statistical approach which leads to strongly reduced and yet, more robust, uncertainty estimates. Furthermore, we demonstrate that the inferred timescale differences are robust independent of (i) the applied ice core 10Be records, (ii) assumptions of the mode of 10Be deposition, as well as (iii) carbon cycle effects on 14C, and (iv) in agreement with independent estimates of the timescale differences. Our results imply that the GICC05 counting error is likely underestimated during the most recent 2000 years leading to a dating bias that propagates throughout large parts of the Holocene. Nevertheless, our analysis indicates that the GICC05 counting error is generally a robust uncertainty measurement but care has to be taken when treating it as a nearly Gaussian error distribution. The proposed IntCal13-GICC05 transfer function facilitates the comparison of ice core and radiocarbon dated paleoclimate records at high chronological precision. # #------------------ # Funding_Agency # Funding_Agency_Name: Swedish Research Council (VR) # Grant: 2013-8421 #------------------ # Site_Information # Site_Name: Greenland # Location: North America>Greenland # Country: # Northernmost_Latitude: 85.0 # Southernmost_Latitude: 60.0 # Easternmost_Longitude: -70.0 # Westernmost_Longitude: -20.0 # Elevation: m #------------------ # Data_Collection # Collection_Name: GICC05-IntCal13diff # Earliest_Year: 11000 BP # Most_Recent_Year: 0 BP # Time_Unit: years before present (1950) # Core_Length: m # Notes: #------------------ # Chronology_Information # Chronology: # GICC05 # IntCal13 (dendrochronology) #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, 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