# Greenland Ice Core GICC05 and Speleothem U/Th Timescale Differences 11-45 kaBP #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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/25631 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/adolphi2018gicc05-u-th.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Core # # Dataset DOI: # # Parameter_Keywords: age control #-------------------- # Contribution_Date # Date: 2018-11-23 #-------------------- # File_Last_Modified_Date # Date: 2018-11-23 #-------------------- # Title # Study_Name: Greenland Ice Core GICC05 and Speleothem U/Th Timescale Differences 11-45 kaBP #-------------------- # Investigators # Investigators: Adolphi, F.; Bronk Ramsey, C.; Erhardt, T.; Edwards, R.L.; Cheng, H.; Turney, C.S.M.; Cooper, A.; Svensson, A.; Rasmussen, S.O.; Fischer, H.; Muscheler, R. #-------------------- # Description_Notes_and_Keywords # Description: Evaluation and estimation of offsets between GICC05 Greenland ice core timescale and U/Th-dated speleothems 11,000 to 45,000 years ago. #-------------------- # Publication # Authors: Florian Adolphi, Christopher Bronk Ramsey, Tobias Erhardt, R. Lawrence Edwards, Hai Cheng, Chris S. M. Turney, Alan Cooper, Anders Svensson, Sune O. Rasmussen, Hubertus Fischer, and Raimund Muscheler # Published_Date_or_Year: 2018-11-20 # Published_Title: Connecting the Greenland ice-core and U/Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard-Oeschger events # Journal_Name: Climate of the Past # Volume: 14 # Edition: # Issue: 11 # Pages: 1755-1781 # Report_Number: # DOI: 10.5194/cp-14-1755-2018 # Online_Resource: https://www.clim-past.net/14/1755/2018/cp-14-1755-2018.html # Full_Citation: # Abstract: During the last glacial period Northern Hemisphere climate was characterized by extreme and abrupt climate changes, so-called Dansgaard-Oeschger (DO) events. Most clearly observed as temperature changes in Greenland ice-core records, their climatic imprint was geographically widespread. However, the temporal relation between DO events in Greenland and other regions is uncertain due to the chronological uncertainties of each archive, limiting our ability to test hypotheses of synchronous change. In contrast, the assumption of direct synchrony of climate changes forms the basis of many timescales. Here, we use cosmogenic radionuclides (10Be, 36Cl, 14C) to link Greenland ice-core records to U/Th-dated speleothems, quantify offsets between the two timescales, and improve their absolute dating back to 45 000 years ago. This approach allows us to test the assumption that DO events occurred synchronously between Greenland ice-core and tropical speleothem records with unprecedented precision. We find that the onset of DO events occurs within synchronization uncertainties in all investigated records. Importantly, we demonstrate that local discrepancies remain in the temporal development of rapid climate change for specific events and speleothems. These may either be related to the location of proxy records relative to the shifting atmospheric fronts or to underestimated U/Th dating uncertainties. Our study thus highlights the potential for misleading interpretations of the Earth system when applying the common practice of climate wiggle matching. #------------------ # Funding_Agency # Funding_Agency_Name: Vetenskapsradet # Grant: 2016-00218, 2013-8421 #------------------ # Funding_Agency_Name: NERC # Grant: NRCF010002 #------------------ # Funding_Agency_Name: Carlsberg Foundation # Grant: ChronoClimate #------------------ # Funding_Agency_Name: US NSF # Grant: 1702816 #------------------ # Funding_Agency_Name: Australian Research Council # Grant: DP170104665 #------------------ # 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: #------------------ # Data_Collection # Collection_Name: Adolphi2018GICC05-U-Th # Earliest_Year: 45000 # Most_Recent_Year: 11000 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # GICC05 (Seierestad et al., Quaternary Sci Rev, 106, 29-46, http://dx.doi.org/10.1016/j.quascirev.2014.10.032, 2014) # IntCal13 applying the revisions of Hogg et al., Radiocarbon, 58, 709-733, 10.1017/RDC.2016.86, 2016. # Hulu2 (Cheng et al., Nature, 534, 640-646, 10.1038/nature18591, 2016) # Bahamas Speleothem (Hoffmann et al., Eart Planet Sc Lett, 289, 1-10, 10.1016/j.epsl.2009.10.004, 2010) # Suigetsu (Bronk Ramsey et al., Science, 338, 370-374, 10.1126/science.1226660, 2012) #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## U/Th_age_BP age, , , calendar years before present, , , , ,N, ## U/Th-GICC05 age difference, , , years, , , , ,N, age difference U/Th-GICC05 ## U/Th-GICC05-68.2- age difference error, , lower 68.2% confidence interval, years, , , , ,N, age difference U/Th-GICC05 confidence interval ## U/Th-GICC05-68.2+ age difference error, , upper 68.2% confidence interval, years, , , , ,N, age difference U/Th-GICC05 confidence interval ## U/Th-GICC05-95.4- age difference error, , lower 95.4% confidence interval, years, , , , ,N, age difference U/Th-GICC05 confidence interval ## U/Th-GICC05-95.4+ age difference error, , upper 95.4% confidence interval, years, , , , ,N, age difference U/Th-GICC05 confidence interval # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # U/Th_age_BP U/Th-GICC05 U/Th-GICC05-68.2- U/Th-GICC05-68.2+ U/Th-GICC05-95.4- U/Th-GICC05-95.4+ 11000 -60 -67 -51 -77 -42 11050 -58 -65 -49 -74 -40 11100 -56 -63 -47 -71 -38 11150 -52 -59 -45 -68 -37 11200 -49 -56 -43 -65 -35 11250 -46 -53 -40 -61 -33 11300 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