GISP2 Ice Core 112KYr Methane Concentration Data Brook, E.J.; Sowers, T.; Orchardo, J. Brook, E.J. Sowers, T. Orchardo, J. earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,ice cores,null,null,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,null,parts per billion,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core (GISP2>LATITUDE 72.6>LONGITUDE -38.5) A methane record from the GISP2 ice core reveals that millennial-scale variations in atmospheric methane concentration characterized much of the past 110,00 years. As previously observed in a shorter record from central Greenland, abrupt concentration shifts of about 50 to 300 parts per billion by volume were coeval with most of the interstadial warming events (better known as Dansgaard-Oeschger events) recorded in the GISP2 ice core throughout the last glacial period. The magnitude of the rapid concentration shifts varied on a longer time scale in a manner consistent with variations in Northern Hemisphere summer insolation, which suggests that insolation may have modulated the effects of interstadial climate change on the terrestrial biosphere. STUDY NOTES: Gas ages were calculated according to the methods described in Brook et al. 1996, and are subject to change. Ice ages were calculated by linear interpolation from the Meese et al. timescale. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Brook, E.J. Investigator : Sowers, T. Investigator : Orchardo, J. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17827 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/gases/gispch4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/gases/gispch4.txt English https://www.ncdc.noaa.gov/paleo/study/17827 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/gases/gispch4.txt Edward J. Brook, Todd Sowers, and Joe Orchardo 1996Rapid Variations in Atmospheric Methane Concentration During the Past 110,000 YearsScience27352871087-109110.1126/science.273.5278.1087 http://www.sciencemag.org/content/273/5278/1087.abstract START YEAR: 112545 cal yr BP * END YEAR: 133 cal yr BP -38.5 72.6 -38.5 72.6