NSIDC-0310 Carbon-13 Isotopic Composition of Atmospheric Methane in Firn Air, South Pole and Siple Dome, Antarctica Todd Sowers Carbon-13 Isotopic Composition of Atmospheric Methane in Firn Air, South Pole and Siple Dome, Antarctica 2007-07-09 Boulder, Colorado USA NSIDC: National Snow and Ice Data Center http://nsidc.org/data/nsidc-0310.html http://dx.doi.org/10.7265/N5ST7MR2 Investigator Todd A. Sowers tas11@psu.edu 1 814 865-1921

Penn State University

Earth and Environment Science Institute

317b Earth and Engineering Science Building

University Park PA 16802 USA Technical Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 x 1 303 492-2468 x

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA EARTH SCIENCE Paleoclimate Ice Core Records Isotopes Carbon-13 of Methane Climatology/Meteorology/Atmosphere AGDC Antarctica Antarctic Ice Sheet Carbon Firn Air Isotope Measurements Firn Air Isotopes Firn Isotopes Gas Isotopes Ice Core Ice Core Chemistry Ice Core Data Methane Paleoclimate Siple Dome Stable Isotopes MASS SPECTROMETERS LABORATORY 1995-01-01 1995-01-31 2001-01-01 2001-01-31 1820 2001 complete -81.403 -81.403 -148.3023 -148.3023 CONTINENT ANTARCTICA SOUTH POLE AND SIPLE DOME Refer to Sowers et al. (2005) for quality assessment information. English NSIDC_AGDC NSIDC National Snow and Ice Data Center http://nsidc.org Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA NSIDC_AGDC NSIDC Antarctic Glaciological Data Center http://nsidc.org/agdc/ Data Center Contact NSIDC AGDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA FTP Microsoft Excel FTP Microsoft Word FTP 37.5 KB Leckrone, K. J., and J. M. Hayes. 1998. Water-induced errors in continuous flow carbon isotope ratio mass spectrometry. Analytical Chemistry 70, 2737-2744. Miller, J. B., K. A. Mack, R. Dissly, J. W. C. White, E. J. Dlugokencky, and P. Tans. 2002. Development of analytical methods and measurements of 13C/12C in atmospheric CH4 from the NOAA Climate Monitoring and Diagnostics Laboratory Global Air Sampling Network. Journal of Geophysical Research 107, 4178-4193. Rice, A., A. A. Gotoh, H. O. Aijie, and S. C. Tyler. 2001. High-precision continuous-flow measurements of d13C and dD of atmospheric CH4 Analytical Chemistry 73, 4104-4110. Santrock, J., S. A. Studley, and J. M. Hayes. 1985. Isotopic analyses based on the mass spectrum of carbon dioxide Analytical Chemistry 57, 1444-1448. Sowers, T., S. Bernard, O. Aballain, J. Chappellaz, J.-M. Barnola, and T. Marik. 2005. Records of the d13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice. Global Biogeochemical Cycles 19, doi:10.1029/2004GB002408.

This data set includes records of the delta carbon-13 (δ¹³C) of methane (CH₄) in firn air from the South Pole and trapped in bubbles in a short ice core from Siple Dome, Antarctica. Using two firn air samples, one from January 1995 and the other from January 2001, investigators reconstructed records of the isotopic composition of paleoatmospheric methane covering the last 2 centuries, from 1820 to 2001. Data are in Microsoft Excel and Microsoft Word formats and are available via FTP.

VIEW RELATED INFORMATION http://nsidc.org/data/nsidc-0290.html Firn Air Inert Gas and Oxygen Observations from Siple Dome, 1996, and the South Pole, 2001 VIEW RELATED INFORMATION http://nsidc.org/data/nsidc-0098.html Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole VIEW RELATED INFORMATION http://nsidc.org/data/nsidc-0123.html Siple Dome Core Date from Measurement of the d18O of Paleoatmospheric O2 VIEW RELATED INFORMATION http://nsidc.org/data/nsidc-0134.html Siple Dome Highlights: Stable isotopes AMD/US CEOS IDN DIF 9.7 2007-07-09 2013-03-18 Added DOI