Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Volume 12, issue 10
Atmos. Chem. Phys., 12, 4365-4377, 2012
https://doi.org/10.5194/acp-12-4365-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Firn air: archive of the recent atmosphere

Atmos. Chem. Phys., 12, 4365-4377, 2012
https://doi.org/10.5194/acp-12-4365-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 May 2012

Research article | 16 May 2012

The isotopic record of Northern Hemisphere atmospheric carbon monoxide since 1950: implications for the CO budget

Z. Wang1, J. Chappellaz2, P. Martinerie2, K. Park1,*, V. Petrenko3,**, E. Witrant4, L. K. Emmons5, T. Blunier6, C. A. M. Brenninkmeijer7, and J. E. Mak1 Z. Wang et al.
  • 1Institute for Terrestrial and Planetary Atmospheres/School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794, USA
  • 2UJF – Grenoble 1/CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE) UMR5183, Grenoble, 38041, France
  • 3Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA
  • 4Grenoble Image Parole Signal Automatique (GIPSA-lab), Université Joseph Fourier/CNRS, BP 46, 38 402 Saint Martin d'Hères, France
  • 5National Center for Atmospheric Research, Atmospheric Chemistry Division, Boulder CO 80301, USA
  • 6Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100 Copenhagen Ø, Denmark
  • 7Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • *now at: Division of Polar Climate Research, Korea Polar Research Institute, Incheon, South Korea
  • **now at: Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, USA

Abstract. We present a 60-year record of the stable isotopes of atmospheric carbon monoxide (CO) from firn air samples collected under the framework of the North Greenland Eemian Ice Drilling (NEEM) project. CO concentration, δ13C, and δ18O of CO were measured by gas chromatography/isotope ratio mass spectrometry (gc-IRMS) from trapped gases in the firn. We applied LGGE-GIPSA firn air models (Witrant et al., 2011) to correlate gas age with firn air depth and then reconstructed the trend of atmospheric CO and its stable isotopic composition at high northern latitudes since 1950. The most probable firn air model scenarios show that δ13C decreased slightly from −25.8‰ in 1950 to −26.4‰ in 2000, then decreased more significantly to −27.2‰ in 2008. δ18O decreased more regularly from 9.8‰ in 1950 to 7.1‰ in 2008. Those same scenarios show CO concentration increased gradually from 1950 and peaked in the late 1970s, followed by a gradual decrease to present day values (Petrenko et al., 2012). Results from an isotope mass balance model indicate that a slight increase, followed by a large reduction, in CO derived from fossil fuel combustion has occurred since 1950. The reduction of CO emission from fossil fuel combustion after the mid-1970s is the most plausible mechanism for the drop of CO concentration during this time. Fossil fuel CO emissions decreased as a result of the implementation of catalytic converters and the relative growth of diesel engines, in spite of the global vehicle fleet size having grown several fold over the same time period.

Publications Copernicus
Special issue
Download
Citation
Share