Greenland Ice Core (GICC05) and Radiocarbon (IntCal13) Holocene Timescale Differences Adolphi, F.; Muscheler, R. Adolphi, F. Muscheler, R. earth science/paleoclimate/ice cores (age,null,null,year,null,ice cores,null,null,N,IntCal13-GICC05 age difference) earth science/paleoclimate/ice cores (age,null,68% confidence interval upper bound,year,null,ice cores,null,null,N,IntCal13-GICC05 age difference upper 68.2% confidence) earth science/paleoclimate/ice cores (age,null,95% confidence interval lower bound,year,null,ice cores,null,null,N,IntCal13-GICC05 age difference lower 95.4% confidence) earth science/paleoclimate/ice cores (age,null,68% confidence interval lower bound,year,null,ice cores,null,null,N,IntCal13-GICC05 age difference lower 68.2% confidence) earth science/paleoclimate/ice cores (age,null,95% confidence interval upper bound,year,null,ice cores,null,null,N,IntCal13-GICC05 age difference upper 95.4% confidence) earth science/paleoclimate/ice cores (age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Greenland>LATITUDE >LONGITUDE ) 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. STUDY NOTES: Greenland ice core timescale (GICC05) and tree-ring based radiocarbon calibration timescale (IntCal13) timescale differences over the Holocene NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Adolphi, F. Investigator : Muscheler, R. 2016-12-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21092 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gicc05adolphi2016.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gicc05adolphi2016.txt English https://www.ncdc.noaa.gov/paleo/study/21092 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gicc05adolphi2016.txt F. Adolphi and R. Muscheler2016Synchronizing the Greenland ice core and radiocarbon timescales over the Holocene - Bayesian wiggle-matching of cosmogenic radionuclide records Climate of the Past12115-3010.5194/cp-12-15-2016http://www.clim-past.net/12/15/2016/ START YEAR: 11000 cal yr BP * END YEAR: 0 cal yr BP -60 60 -20 82