# Law Dome, Antarctica 2000 Year Ice Core CO2, CH4, N2O and d13C-CO2 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/25830 # 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-icecore-25830.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Ice Cores # # Dataset_DOI: 10.25921/dwg2-6m61 # # Science_Keywords: #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2018d13c-co2-noaa.txt # Data_Download_Description: NOAA Template File; Law Dome 1000 Year Ice Core d13C-CO2 Data # #-------------------- # Contribution_Date # Date: 2018-12-14 #-------------------- # File_Last_Modified_Date # Date: 2024-08-18 #-------------------- # Title # Study_Name: Law Dome, Antarctica 2000 Year Ice Core CO2, CH4, N2O and d13C-CO2 Data #-------------------- # Investigators # Investigators: Rubino, M.(https://orcid.org/0000-0002-8721-4508); Etheridge, D.M.(https://orcid.org/0000-0001-7970-2002); Thornton, D.P.; Howden, R.; Allison, C.E.(https://orcid.org/0000-0002-7796-6917); Francey, R.J.; Langenfelds, R.L.(https://orcid.org/0000-0003-4890-2049); Steele, L.P.(https://orcid.org/0000-0002-8234-3730); Trudinger, C.(https://orcid.org/0000-0002-4844-2153); Spencer, D.A.; Curran, M.A.J.(https://orcid.org/0000-0003-1874-4086); van Ommen, T.D.(https://orcid.org/0000-0002-2463-1718); Smith, A.M.(https://orcid.org/0000-0002-9193-2617) #-------------------- # Description_Notes_and_Keywords # Description: Law Dome ice core (DSS, DSS0506, DE08 and DE08-2) and firn air (DE08-2 and DSSW20K) records of CO2, CH4 and N2O concentrations for the past 2000 years and d13C-CO2 for the past 1000 years. The latest CSIRO Cape Grim instrumental trace gas data can be found at: https://www.csiro.au/en/Research/OandA/Areas/Assessing-our-climate/Latest-greenhouse-gas-data #-------------------- # Publication # Authors: Mauro Rubino, David Etheridge, David Thornton, Russell Howden, Colin Allison, Roger Francey, Ray Langenfelds, Paul Steele, Cathy Trudinger, Darren Spencer, Mark Curran, Tas Van Ommen, and Andrew Smith # Journal_Name: Earth System Science Data # Published_Title: Revised records of atmospheric trace gases CO2, CH4, N2O and d13C-O2 over the last 2000 years from Law Dome, Antarctica # Published_Date_or_Year: 2019 # Volume: 11 # Pages: 473–492 # Issue: # Report_Number: # DOI: 10.5194/essd-11-473-2019 # Full_Citation: # Abstract: Ice core records of the major atmospheric greenhouse gases (CO2, CH4, N2O) and their isotopologues covering recent centuries provide evidence of biogeochemical variations during the Late Holocene and pre-industrial periods and over the transition to the industrial period. These records come from a number of ice core and firn air sites and have been measured in several laboratories around the world and show common features but also unresolved differences. Here we present revised records, including new measurements, performed at the CSIRO Ice Core Extraction LABoratory (ICELAB) on air samples from ice obtained at the high-accumulation site of Law Dome (East Antarctica). We are motivated by the increasing use of the records by the scientific community and by recent data-handling developments at CSIRO ICELAB. A number of cores and firn air samples have been collected at Law Dome to provide high-resolution records overlapping recent, direct atmospheric observations. The records have been updated through a dynamic link to the calibration scales used in the Global Atmospheric Sampling LABoratory (GASLAB) at CSIRO, which are periodically revised with information from the latest calibration experiments. The gas-age scales have been revised based on new ice-age scales and the information derived from a new version of the CSIRO firn diffusion model. Additionally, the records have been revised with new, rule-based selection criteria and updated corrections for biases associated with the extraction procedure and the effects of gravity and diffusion in the firn. All measurements carried out in ICELAB–GASLAB over the last 25 years are now managed through a database (the ICElab dataBASE or ICEBASE), which provides consistent data management, automatic corrections and selection of measurements, and a web-based user interface for data extraction. We present the new records, discuss their strengths and limitations, and summarise their main features. The records reveal changes in the carbon cycle and atmospheric chemistry over the last 2 millennia, including the major changes of the anthropogenic era and the smaller, mainly natural variations beforehand. They provide the historical data to calibrate and test the next inter-comparison of models used to predict future climate change (Coupled Model Inter-comparison Project – phase 6, CMIP6). The datasets described in this paper, including spline fits, are available at https://doi.org/10.25919/5bfe29ff807fb (Rubino et al., 2019). #-------------------- # Funding_Agency # Funding_Agency_Name: CSIRO # Grant: #-------------------- # Funding_Agency # Funding_Agency_Name: Australian Antarctic Science Advisory Committee # Grant: #-------------------- # Funding_Agency # Funding_Agency_Name: Australian Government Department of the Environment and Energy # Grant: #-------------------- # Site_Information # Site_Name: Law Dome # Location: Antarctica # Northernmost_Latitude: -66.73 # Southernmost_Latitude: -66.73 # Easternmost_Longitude: 112.83 # Westernmost_Longitude: 112.83 # Elevation_m: 1390 #-------------------- # Data_Collection # Collection_Name: Law2018d13-CO2 # First_Year: 1019 # Last_Year: 1993 # Time_Unit: CE # Core_Length_m: # Parameter_Keywords: carbon isotopes # Notes: Law Dome ice core (DSS, DSS0506, DE08 and DE08-2) and firn air (DE08-2 and DSSW20K) records of d13C-CO2 #-------------------- # 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) # ## SampleID sample identification,,,,,ice cores,,,C, ## age_ice ice age,,,year Common Era,,ice cores,,,C, ## age_CO2 gas age,,,year Common Era,,ice cores,,,N, ## d13CO2 delta 13C,carbon dioxide,,per mil,,ice cores,,,N, ## d13CO2err delta 13C,carbon dioxide,unspecified margin of error,per mil,,ice cores,,,N, #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: SampleID age_ice age_CO2 d13CO2 d13CO2err DE08-2 0 firn 1993 -7.84 0.02 DSSW20K 37.8 firn 1992 -7.85 0.04 DE08-2 10 firn 1991 -7.80 0.02 DE08-2 15 firn 1991 -7.77 0.02 DE08-2 20 firn 1990 -7.78 0.02 DSSW20K 41.7 firn 1989 -7.80 0.03 DE08-2 30 firn 1989 -7.78 0.02 DE08-2 40 firn 1988 -7.77 0.02 DE08-2 55 firn 1987 -7.71 0.02 DE08-2 60 firn 1986 -7.73 0.02 DE08-2 65 firn 1986 -7.70 0.02 DE08-2 70 firn 1985 -7.67 0.02 DSSW20K 44.5 firn 1983 -7.66 0.04 DE08-2 75 firn 1983 -7.61 0.02 DE08-2 80 firn 1979 -7.51 0.02 DE08-2 012 1948 1979 -7.54 0.07 DE08-2 003 1945 1976 -7.50 0.05 DE08-2 85 firn 1976 -7.45 0.02 DE08-2 052 1941 1972 -7.50 0.03 DE08-2 015 1940 1971 -7.37 0.07 DSSW20K 47 firn 1971 -7.24 0.03 DE08-2 016 1939 1970 -7.33 0.07 DE08 235 1938 1969 -7.23 0.05 DE08 439 1938 1969 -7.35 0.04 DE08-2 051 1936 1967 -7.34 0.03 DE08 440 1936 1967 -7.35 0.04 DE08 432 1932 1963 -7.08 0.19 DE08 212 1932 1963 -7.11 0.05 DSS0506 15 1898 1958 -7.10 0.03 DE08 416 1926 1957 -7.13 0.01 DSSW20K 49.5 firn 1957 -7.02 0.03 DE08 415 1926 1957 -7.12 0.01 DE08 464 1924 1955 -7.13 0.05 DE08 465 1924 1955 -7.16 0.05 DSS 029 1890 1950 -7.02 0.05 DE08-2 009 1918 1949 -7.05 0.05 DE08-2 034 1917 1948 -7.00 0.11 DE08-2 035 1916 1947 -7.04 0.07 DE08-2 007 1910 1941 -7.01 0.07 DE08 423 1910 1941 -7.03 0.02 DSS 037 1880 1940 -6.86 0.05 DE08 243 1908 1939 -7.01 0.07 DSS0506 08 1879 1939 -6.97 0.04 DE08 422 1908 1939 -7.04 0.02 DE08 473 1908 1939 -7.01 0.04 DSS 027 1878 1938 -6.98 0.05 DSSW20K 52 firn 1938 -6.93 0.03 DE08 418 1906 1937 -7.01 0.02 DE08 419 1906 1937 -6.98 0.03 DE08 420 1905 1936 -6.97 0.02 DE08 444 1904 1935 -7.01 0.03 DE08 443 1902 1933 -6.99 0.03 DE08 238 1902 1933 -6.91 0.05 DE08 437 1900 1931 -7.03 0.03 DE08 438 1900 1931 -6.99 0.03 DSS 041 1869 1929 -6.85 0.07 DE08-2 044 1895 1926 -6.97 0.11 DE08 430 1889 1920 -6.97 0.13 DE08 233 1885 1916 -6.92 0.05 DE08 239 1882 1913 -6.88 0.05 DE08 429 1879 1910 -6.93 0.13 DSS0506 07 1847 1907 -6.83 0.04 DSS 033 1846 1906 -6.76 0.10 DE08 254 1875 1906 -6.84 0.07 DE08 435 1869 1900 -6.80 0.02 DE08 230 1868 1899 -6.69 0.05 DSS0506 14 1834 1894 -6.81 0.03 DE08 427 1859 1890 -6.81 0.02 DE08 470 1856 1887 -6.80 0.03 DE08 471 1856 1887 -6.78 0.02 DE08 229 1852 1883 -6.73 0.07 DE08 425 1849 1880 -6.75 0.02 DE08 436 1839 1870 -6.73 0.02 DE08 379a 1838 1869 -6.76 0.07 DE08 380a 1838 1869 -6.75 0.07 DE08 447 1833 1864 -6.73 0.03 DE08 232 1831 1862 -6.69 0.05 DE08 421 1826 1857 -6.69 0.03 DSS0506 17 1795 1855 -6.80 0.03 DSS0506 18 1792 1852 -6.77 0.03 DE08 446 1820 1851 -6.67 0.04 DE08 433 1814 1845 -6.62 0.13 DE08 414 1814 1845 -6.70 0.01 DE08 441 1813 1844 -6.69 0.03 DE08 442 1813 1844 -6.69 0.04 DE08 466 1812 1843 -6.67 0.03 DE08 467 1811 1842 -6.72 0.03 DSS0506 16 1778 1838 -6.67 0.03 DE08-2 006 1801 1833 -6.69 0.07 DSS0506 23 1766 1826 -6.68 0.03 DSS0506 24 1715 1775 -6.54 0.03 DSS 031 1703 1763 -6.42 0.07 DSS0506 25 1700 1760 -6.53 0.03 DSS 014 1692 1752 -6.41 0.05 DSS0506 22 1686 1746 -6.51 0.04 DSS 019 1663 1723 -6.49 0.07 DSS 011 1634 1694 -6.45 0.05 DSS 032 1513 1573 -6.43 0.07 DSS 035 1470 1530 -6.50 0.05 DSS 024 1330 1390 -6.56 0.05 DSS 026 1330 1390 -6.59 0.05 DSS 034 1270 1330 -6.55 0.10 DSS 039 1191 1251 -6.55 0.05 DSS 042 1039 1099 -6.55 0.07 DSS 038 959 1019 -6.54 0.05