Articles | Volume 13, issue 2
Atmos. Chem. Phys., 13, 837–850, 2013
Atmos. Chem. Phys., 13, 837–850, 2013

Research article 22 Jan 2013

Research article | 22 Jan 2013

Decadal record of satellite carbon monoxide observations

H. M. Worden1, M. N. Deeter1, C. Frankenberg2, M. George3, F. Nichitiu4, J. Worden2, I. Aben5, K. W. Bowman2, C. Clerbaux3,6, P. F. Coheur6, A. T. J. de Laat5,7, R. Detweiler1, J. R. Drummond8, D. P. Edwards1, J. C. Gille1, D. Hurtmans6, M. Luo2, S. Martínez-Alonso3, S. Massie1, G. Pfister1, and J. X. Warner9 H. M. Worden et al.
  • 1National Center for Atmospheric Research (NCAR), Boulder, CO, USA
  • 2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  • 3UPMC Univ. Paris 06; Université Versailles St-Quentin; CNRS/INSU, LATMOS-IPSL, Paris, France
  • 4Dept. of Physics and Atmospheric Science, University of Toronto, Toronto, Ontario, Canada
  • 5SRON Netherlands Institute for Space Research, Utrecht, The Netherlands
  • 6Spectroscopie de l'Atmosphère, Service de Chimie Quantique et Photophysique, Libre Université de Bruxelles (ULB), Brussels, Belgium
  • 7Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands
  • 8Dept. of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
  • 9Dept. of Atmospheric and Oceanic Science, Univ. of Maryland, College Park, MD, USA

Abstract. Atmospheric carbon monoxide (CO) distributions are controlled by anthropogenic emissions, biomass burning, transport and oxidation by reaction with the hydroxyl radical (OH). Quantifying trends in CO is therefore important for understanding changes related to all of these contributions. Here we present a comprehensive record of satellite observations from 2000 through 2011 of total column CO using the available measurements from nadir-viewing thermal infrared instruments: MOPITT, AIRS, TES and IASI. We examine trends for CO in the Northern and Southern Hemispheres along with regional trends for Eastern China, Eastern USA, Europe and India. We find that all the satellite observations are consistent with a modest decreasing trend ~ −1 % yr−1 in total column CO over the Northern Hemisphere for this time period and a less significant, but still decreasing trend in the Southern Hemisphere. Although decreasing trends in the United States and Europe have been observed from surface CO measurements, we also find a decrease in CO over E. China that, to our knowledge, has not been reported previously. Some of the interannual variability in the observations can be explained by global fire emissions, but the overall decrease needs further study to understand the implications for changes in anthropogenic emissions.

Final-revised paper