North Greenland Eemian (NEEM) Ice Core 107KYr High-Resolution Methane Data Chappellaz, J.A.; Stowasser, C.; Blunier, T.; Baslev-Clausen, D.; Brook, E.J.; Dallmayr, R.; Faïn, X.; Lee, J.-E.; Mitchell, L.E.; Pascual, O.; Romanini, D.; Rosen, J.; Schüpbach, S. Chappellaz, J.A. Stowasser, C. Blunier, T. Baslev-Clausen, D. Brook, E.J. Dallmayr, R. Faïn, X. Lee, J.-E. Mitchell, L.E. Pascual, O. Romanini, D. Rosen, J. Schüpbach, S. earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,one standard error,parts per billion,null,climate forcing|ice cores,corrected,cavity ring-down spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,cavity ring-down spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,optical feedback cavity enhanced absorption spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected,cavity ring-down spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected|smoothed,optical feedback cavity enhanced absorption spectroscopy,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar year before present,null,ice cores,null,null,N,Present is 2000 AD) earth science/paleoclimate/ice cores (number of samples,null,null,count,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected,optical feedback cavity enhanced absorption spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,smoothed,cavity ring-down spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,corrected|smoothed,cavity ring-down spectroscopy,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,one standard error,parts per billion,null,climate forcing|ice cores,null,optical feedback cavity enhanced absorption spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,smoothed,optical feedback cavity enhanced absorption spectroscopy,N,null) earth science/paleoclimate/ice core (NEEM>LATITUDE 77.45>LONGITUDE -51.06) The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric methane (CH4) record covering the time period from 107.7 to 9.5 ka b2k (thousand years before 2000 AD). Companion discrete CH4 measurements are required to transfer the laser spectroscopic data from a relative to an absolute scale. However, even on a relative scale, the high-resolution CH4 data set significantly improves our knowledge of past atmospheric methane concentration changes. New significant sub-millennial-scale features appear during interstadials and stadials, generally associated with similar changes in water isotopic ratios of the ice, a proxy for local temperature. In addition to the midpoint of Dansgaard-Oeschger (D/O) CH4 transitions usually used for cross-dating, sharp definition of the start and end of these events brings precise depth markers (with +/- 20 cm uncertainty) for further cross-dating with other palaeo- or ice core records, e.g. speleothems. The method also provides an estimate of CH4 rates of change. The onsets of D/O events in the methane signal show a more rapid rate of change than their endings. The rate of CH4 increase associated with the onsets of D/O events progressively declines from 1.7 to 0.6 ppbv yr-1 in the course of marine isotope stage 3. The largest observed rate of increase takes place at the onset of D/O event 21 and reaches 2.5 ppbv yr-1. STUDY NOTES: High-resolution methane (CH4) data from the North Greenland Eemian (NEEM) ice core for the time period 107.7 to 9.5 ka b2k. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Chappellaz, J.A. Investigator : Stowasser, C. Investigator : Blunier, T. Investigator : Baslev-Clausen, D. Investigator : Brook, E.J. Investigator : Dallmayr, R. Investigator : Faïn, X. Investigator : Lee, J.-E. Investigator : Mitchell, L.E. Investigator : Pascual, O. Investigator : Romanini, D. Investigator : Rosen, J. Investigator : Schüpbach, S. 2015-02-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18095 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4.zip https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4section-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-cont.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-cont.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4.zip https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4section-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-cont.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-cont.txt English https://www.ncdc.noaa.gov/paleo/study/18095 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4.zip https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4section-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4ofceas-cont.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-mean.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013ch4wscrds-cont.txt J. Chappellaz, C. Stowasser, T. Blunier, D. Baslev-Clausen, E.J. Brook, R. Dallmayr, X. Faïn, J.E. Lee, L.E. Mitchell, O. Pascual, D. Romanini, J. Rosen, and S. Schüpbach2013High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice coreClimate of the Past962579-259310.5194/cp-9-2579-2013http://www.clim-past.net/9/2579/2013/cp-9-2579-2013.html START YEAR: 107667 cal yr BP * END YEAR: 9527 cal yr BP -51.06 77.45 -51.06 77.45