# 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 #
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# 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
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# Science_Keywords: 
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# 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
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# File_Last_Modified_Date
#   Date: 2024-08-18
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# 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).
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# Funding_Agency
#   Funding_Agency_Name: CSIRO
#   Grant:
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# Funding_Agency
#   Funding_Agency_Name: Australian Antarctic  Science Advisory Committee
#   Grant:
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# Funding_Agency
#   Funding_Agency_Name: Australian Government Department of the Environment and Energy
#   Grant:
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# 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
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# 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:
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# 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)
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## 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
