NGRIP Ice Core Termination 1 CH4 and N2O Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: NGRIP Ice Core Termination 1 CH4 and N2O Data LAST UPDATE: 12/2010 (Original receipt by WDC Paleo) CONTRIBUTORS: Schilt, A., R. Spahni, and T.F. Stocker. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2010-131 WDC PALEO CONTRIBUTION SERIES CITATION: Schilt, A., et al. 2010. NGRIP Ice Core Termination 1 CH4 and N2O Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2010-131. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: 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 ABSTRACT: 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. GEOGRAPHIC REGION: Greenland PERIOD OF RECORD: Termination 1, ~ 16 - 11 KYrBP FUNDING SOURCES: This work is a contribution to the North Greenland Ice Sheet Project (NGRIP), which is directed and organized by the Department of Geophysics at the Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen, and it is supported by funding agencies in Denmark (SNF), Belgium (FNRS-CFB), France (IPEV and INSU/CNRS), Germany (AWI), Iceland (RANNIS), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the United States of America (NSF, Office of Polar Programs). We acknowledge financial support by the Swiss NSF and the University of Bern. DESCRIPTION: 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. DATA: NGRIP CH4 and N2O DATA: Column 1: NGRIP depth (m) Column 2: CH4 concentration (parts per billion by volume, ppbv) Column 3: 1-sigma uncertainty CH4 concentration (parts per billion by volume, ppbv) Column 4: N2O concentration (parts per billion by volume, ppbv) Column 5: N2O artifact concentration (parts per billion by volume, ppbv) Column 6: 1-sigma uncertainty N2O concentration (parts per billion by volume, ppbv) 1 2 3 4 5 6 NGRIP CH4 CH4_err. N2O N2O_arti. N2O_err depth conc. conc. conc. conc. conc. (m) (ppbv) (ppbv) (ppbv) (ppbv) (ppbv) 1619.8 649.0 10.0 NaN 310.7 3.8 1622.5 653.0 10.0 259.0 NaN 3.4 1625.3 636.7 10.0 248.3 NaN 3.5 1628.1 638.0 10.0 NaN 684.0 5.2 1630.8 582.3 10.0 229.7 NaN 3.8 1633.5 522.0 10.0 227.0 NaN 3.7 1636.3 506.5 15.0 219.5 NaN 3.7 1639.0 518.7 10.0 209.7 NaN 3.5 1641.8 493.7 10.0 217.3 NaN 3.5 1644.5 489.0 10.0 205.7 NaN 3.5 1647.3 502.7 10.0 208.0 NaN 3.4 1650.0 493.0 10.0 201.7 NaN 4.0 1652.8 493.3 10.0 205.0 NaN 3.7 1655.5 477.7 10.0 203.0 NaN 3.7 1658.3 466.0 10.0 201.3 NaN 3.5 1661.0 507.7 10.0 197.7 NaN 4.0 1663.2 474.3 10.0 206.3 NaN 3.5 1666.5 485.0 10.0 210.0 NaN 3.7 1669.3 459.0 10.0 191.0 NaN 3.7 1672.0 444.7 10.0 194.7 NaN 3.5 1674.8 491.7 10.0 201.0 NaN 3.4 1677.5 429.3 10.0 NaN 236.3 3.5 1680.3 439.3 10.0 197.0 NaN 3.7 1683.0 424.3 10.0 197.0 NaN 3.4 1685.8 424.0 10.0 196.7 NaN 3.5 1688.5 403.7 10.0 NaN 392.0 3.7 1691.3 418.3 10.0 NaN 227.3 4.0 1694.1 384.0 10.0 200.7 NaN 3.5 1696.8 393.3 10.0 200.0 NaN 3.7 1699.5 393.0 10.0 200.0 NaN 3.9 1702.3 399.0 10.0 206.0 NaN 3.7