NOAA/WDS Paleoclimatology - Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data
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title: NOAA/WDS Paleoclimatology - Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data
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date: 2010-07-16
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abstract: This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Ice Core. The data include parameters of climate forcing|ice cores with a geographic location of Antarctica. The time period coverage is from 1949 to -56 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
purpose: Records of past temperature, precipitation, atmospheric trace gases, and other aspects of climate and environment derived from ice cores drilled on glaciers and ice caps around the world. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations.
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keyword: Earth Science > Climate Indicators > Paleoclimate Indicators > Ice Core Records
keyword: Earth Science > Paleoclimate > Ice Core Records
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keyword: earth science > paleoclimate > climate forcing|ice cores
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keyword: earth science > paleoclimate > climate forcing|ice cores
keyword: earth science > paleoclimate > climate forcing|ice cores
keyword: earth science > paleoclimate > climate forcing|ice cores
keyword: earth science > paleoclimate > climate forcing|ice cores
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keyword: earth science > paleoclimate > climate forcing|ice cores
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keyword: earth science > paleoclimate > climate forcing|ice cores
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keyword: earth science > paleoclimate > ice core > atmospheric gas
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keyword: carbon cycle
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keyword: What: sample identification; Material: null
keyword: What: nitrous oxide; Material: bulk atmosphere
keyword: What: methane; Material: bulk atmosphere
keyword: What: carbon dioxide; Material: bulk atmosphere
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keyword: What: gas age; Material: null
keyword: What: methane; Material: bulk atmosphere
keyword: What: carbon dioxide; Material: bulk atmosphere
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keyword: Continent > Antarctica > Law Dome > LATITUDE -66.73 > LONGITUDE 112.83
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keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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otherConstraints: Cite as: MacFarling Meure, C.; Etheridge, D.M.; Trudinger, C.; Steele, L.P.; Langenfelds, R.L.; van Ommen, T.D.; Smith, A.M.; Elkins, J. (2010-07-16): NOAA/WDS Paleoclimatology - Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/g6kd-k189. Accessed [date].
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otherConstraints: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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otherConstraints: Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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otherConstraints: Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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title: Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 years BP
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date: 2006
dateType: (CI_DateTypeCode) publication
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individualName: MacFarling Meure, C., D. Etheridge, C. Trudinger, P. Steele, R. Langenfelds, T. van Ommen, A. Smith, and J. Elkins
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description: MacFarling Meure, C., D. Etheridge, C. Trudinger, P. Steele, R. Langenfelds, T. van Ommen, A. Smith, and J. Elkins, 2006: Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 years BP. Geophysical Research Letters, 33, 4115-4128, 10.1029/2006GL026152
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description: Date Range: 1 CE to 2006 CE; Date Range: 1949 cal yr BP to -56 cal yr BP;
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westBoundLongitude: 112.83
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southBoundLatitude: -66.73
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supplementalInformation: STUDY NOTES: Law Dome ice core (DSS, DE08 and DE08-2), firn air (DSSW20K), and Cape Grim instrumental (deseasonalised archive, insitu and flask) records of CO2, CH4 and N2O concentrations for the past 2000 years. The dome summit is as follows, individual cores are within about 25 km (see publications): 66°44'S, 112°50'E, 1390m elevation. Measurement precision for the ice core air samples is 4.1 ppb CH4, 1.1 ppm CO2, and 6.5 ppb N2O. Measurement precision for the firn air samples is 2 ppb CH4, 0.1 ppm CO2 and 0.3 ppb N2O. Ice core concentrations are adjusted for small system enhancements (1.1 ± 0.8 ppm for CO2, 4.1 ± 4.0 ppb for CH4, and 1.8 ± 0.9 ppb for N2O) as described in MacFarling Meure et al. (2006) and for the effects of gravitational fractionation, also small, as described in Etheridge et al. 1996, 1998. Air age spread is 10-12 years for DE08/-2 ice samples, 18-20 years for DSS ice samples and 5 years for DSSW20K firn air samples. See Trudinger et al., 2002 for statistical definitions. DE08 and DE08-2 ice core air dating uncertainty is less than +/- 3 years. DSS ice core air dating uncertainty is less than +/- 5 years. DSS ice dating has been revised based on new accumulation rates and temperatures (van Ommen, T., V. Morgan and M.A.J. Curran. 2004. Deglacial and Holocene changes in accumulation at Law Dome, East Antarctica, Annals Glaciol., 39, 359-365.; MacFarling Meure 2004). The dating of published DSS concentrations have been adjusted by less than 5 years under the new chronology. Original references: a) Ice Core results: Law Dome CO2 and CH4 records of the last 1000 years first published in Etheridge et al., 1996 and 1998. Newer results which fill in gaps, extend record to 2000 BP and include N2O, were published and explained in detail in MacFarling Meure et al. 2006 and MacFarling Meure 2004. Some new CH4 results were also published in Ferretti et al. 2005. b) Firn air results: From Etheridge et al. 1998, Trudinger et al. 2002, Sturrock et al. 2002. c) Cape Grim record: The Cape Grim record is composed of deseasonalised air archive and flask records for CH4 and N2O and deseasonalised flask and in situ records for CO2, from Langenfelds et al. 1996, 2004. ABSTRACT SUPPLIED BY ORIGINATOR: New measurements of atmospheric greenhouse gas concentrations in ice from Law Dome, Antarctica reproduce published Law Dome CO2 and CH4 records, extend them back to 2000 years BP, and include N2O. They have very high air age resolution, data density and measurement precision. Firn air measurements span the past 65 years and overlap with the ice core and direct atmospheric observations. Major increases in CO2, CH4 and N2O concentrations during the past 200 years followed a period of relative stability beforehand. Decadal variations during the industrial period include the stabilization of CO2 and slowing of CH4 and N2O growth in the 1940s and 1950s. Variations of up to 10 ppm CO2, 40 ppb CH4 and 10 ppb N2O occurred throughout the preindustrial period. Methane concentrations grew by 100 ppb from AD 0 to 1800, possibly due to early anthropogenic emissions.
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fees: In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
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