Talos Dome and EDML Ice Core 140KYr N2O and CH4 Data Schilt, A.; Baumgartner, S.M.; Schwander, J.; Buiron, D.; Capron, E.; Chappellaz, J.A.; Loulergue, L.; Schüpbach, S.; Spahni, R.; Fischer, H.; Stocker, T.F. Schilt, A. Baumgartner, S.M. Schwander, J. Buiron, D. Capron, E. Chappellaz, J.A. Loulergue, L. Schüpbach, S. Spahni, R. Fischer, H. Stocker, T.F. Glacial earth science/paleoclimate/ice cores (notes,null,null,null,null,ice cores,null,null,N,artefact flagging) earth science/paleoclimate/climate forcing|ice cores (nitrous oxide,bulk atmosphere,one standard deviation,parts per billion,null,climate forcing|ice cores,null,gas chromatography - electron capture detection|wet extraction,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 deviation,parts per billion,null,climate forcing|ice cores,null,gas chromatography - flame ionization detection|wet extraction,N,uncertainty a mix of multiple measurements and blanks) earth science/paleoclimate/climate forcing|ice cores (nitrous oxide,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,gas chromatography - electron capture detection,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,gas chromatography - flame ionization detection|wet extraction,N,null) earth science/paleoclimate/climate forcing|ice cores (nitrous oxide,bulk atmosphere,one standard deviation,parts per billion,null,climate forcing|ice cores,null,gas chromatography - electron capture detection,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/climate forcing|ice cores (methane,bulk atmosphere,one standard deviation,parts per billion,null,climate forcing|ice cores,null,gas chromatography - flame ionization detection|wet extraction,N,null) earth science/paleoclimate/climate forcing|ice cores (nitrous oxide,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,gas chromatography - electron capture detection|wet extraction,N,null) earth science/paleoclimate/ice core (Talos Dome TALDICE>LATITUDE -72.8166>LONGITUDE 159.1833) (EPICA Dronning Maud Land>LATITUDE -75>LONGITUDE .07) (NGRIP>LATITUDE 75.1>LONGITUDE -42.33) Reconstructions of past atmospheric concentrations of greenhouse gases provide unique insight into the biogeochemical cycles and the past radiative forcing in the Earth's climate system. We present new measurements of atmospheric nitrous oxide along the ice cores of the North Greenland Ice Core Project and Talos Dome sites. Using records of several other ice cores, we are now able to establish the first complete composite nitrous oxide record reaching back to the beginning of the previous interglacial about 140,000 yr ago. On the basis of such composite ice core records, we further calculate the radiative forcing of the three most important greenhouse gases carbon dioxide, methane and nitrous oxide during more than a full glacial-interglacial cycle. Nitrous oxide varies in line with climate, reaching very low concentrations of about 200 parts per billion by volume during Marine Isotope Stages 4 and 2, and showing substantial responses to millennial time scale climate variations during the last glacial. A large part of these millennial time scale variations can be explained by parallel changes in the sources of methane and nitrous oxide. However, as revealed by high-resolution measurements covering the Dansgaard/Oeschger events 17 to 15, the evolution of these two greenhouse gases may be decoupled on the centennial time scale. Carbon dioxide and methane concentrations do not reach interglacial levels in the course of millennial time scale climate variations during the last glacial. In contrast, nitrous oxide often reaches interglacial concentrations in response to both, glacial terminations and Dansgaard/Oeschger events. This indicates, from a biogeochemical point of view, similar drivers in both temporal cases. While carbon dioxide and methane concentrations are more strongly controlled by climate changes in high latitudes, nitrous oxide emissions changes may mainly stem from the ocean and/or from soils located at low latitudes. Accordingly, we speculate that high latitudes could play the leading role to trigger glacial terminations. STUDY NOTES: N2O record from the Talos Dome ice core, Antarctica, 72°47' S, 159°04' E, covering the last 140 Kyr. CH4 record from the EPICA Dronning Maud Land ice core, Antarctica, 75°00'S, 00°04'E, covering the last 140 Kyr. N2O record from the NGRIP ice core (Greenland, 75°06' N, 42°20' W) covering Dansgaard/Oeschger events 15 to 17, 64 to 55 KYrBP. CH4 and N2O data from the North Greenland Ice Sheet Project (NGRIP) ice core (75°06' N, 42°20' W) covering Termination 1, ~16-11 KYrBP. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Schilt, A. Investigator : Baumgartner, S.M. Investigator : Schwander, J. Investigator : Buiron, D. Investigator : Capron, E. Investigator : Chappellaz, J.A. Investigator : Loulergue, L. Investigator : Schüpbach, S. Investigator : Spahni, R. Investigator : Fischer, H. Investigator : Stocker, T.F. 2010-11-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9893 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.xls English https://www.ncdc.noaa.gov/paleo/study/9893 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/talos/talos-n2o-140k.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-n2o-do15-17.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip-ch4-n2o-term1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/edml-ch4-140k.xls Schilt, A., M. Baumgartner, J. Schwander, D. Buiron, E. Capron, J. Chappellaz, L. Loulergue, S. Schüpbach, R. Spahni, H. Fischer, and T.F. Stocker. 2010. Atmospheric nitrous oxide during the last 140,000 years. Earth and Planetary Science Letters, Vol. 300, pp. 33-43. doi:10.1016/j.epsl.2010.09.027 START YEAR: 139904 cal yr BP * END YEAR: 171 cal yr BP -42.33 -75 159.1833 75.1