Revised records of atmospheric trace gases CO2, CH4, N2O, and δ13C-CO2 over the last 2000 years from Law Dome, Antarctica

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dc.contributor.authorRubino, Men_AU
dc.contributor.authorEtheridge, DMen_AU
dc.contributor.authorThornton, DPen_AU
dc.contributor.authorHowden, Ren_AU
dc.contributor.authorAllison, CEen_AU
dc.contributor.authorFrancey, RJen_AU
dc.contributor.authorLangenfelds, RLen_AU
dc.contributor.authorSteele, LPen_AU
dc.contributor.authorTrudinger, CMen_AU
dc.contributor.authorSpencer, DAen_AU
dc.contributor.authorCurran, MAJen_AU
dc.contributor.authorvan Ommen, TDen_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2022-06-02T20:05:29Zen_AU
dc.date.available2022-06-02T20:05:29Zen_AU
dc.date.issued2019-04-11en_AU
dc.date.statistics2022-05-10en_AU
dc.description.abstractIce 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). © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.en_AU
dc.identifier.citationRubino, M., Etheridge, D. M., Thornton, D. P., Howden, R., Allison, C. E., Francey, R. J., Langenfelds, R. L., Steele, L. P., Trudinger, C. M., Spencer, D. A., Curran, M. A. J., van Ommen, T. D., & Smith, A. M. (2019). Revised records of atmospheric trace gases CO 2, CH 4, N 2 O, and δ 13 C-CO 2 over the last 2000 years from Law Dome, Antarctica. Earth System Science Data, 11(2), 473-492. doi:10.5194/essd-11-473-2019en_AU
dc.identifier.issn1866-3516en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleEarth System Science Dataen_AU
dc.identifier.pagination473-492en_AU
dc.identifier.urihttps://doi.org/10.5194/essd-11-473-2019en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13256en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectAtmospheric chemistryen_AU
dc.subjectAntarcticaen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectMethaneen_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectDrill coresen_AU
dc.subjectIceen_AU
dc.titleRevised records of atmospheric trace gases CO2, CH4, N2O, and δ13C-CO2 over the last 2000 years from Law Dome, Antarcticaen_AU
dc.typeJournal Articleen_AU
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