Articles | Volume 9, issue 22
Atmos. Chem. Phys., 9, 8735–8743, 2009

Special issue: The IASI instrument onboard the METOP satellite: first...

Atmos. Chem. Phys., 9, 8735–8743, 2009

  16 Nov 2009

16 Nov 2009

On the capability of IASI measurements to inform about CO surface emissions

A. Fortems-Cheiney1, F. Chevallier1, I. Pison1, P. Bousquet1, C. Carouge1,*, C. Clerbaux2, P.-F. Coheur3, M. George2, D. Hurtmans3, and S. Szopa1 A. Fortems-Cheiney et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, Gif-sur-Yvette, France
  • 2UPMC Univ Paris 06, CNRS UMR8190, LATMOS/IPSL, Paris, France
  • 3Spectroscopie de l'atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium
  • *now at: Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA

Abstract. Between July and November 2008, simultaneous observations were conducted by several orbiting instruments that monitor carbon monoxide in the atmosphere, among them the Infrared Atmospheric Sounding Instrument (IASI) and Measurements Of Pollution In The Troposphere (MOPITT). In this paper, the concentration retrievals at about 700 hPa from these two instruments are successively used in a variational Bayesian system to infer the global distribution of CO emissions. Starting from a global emission budget of 479 Tg for the considered period, the posterior estimate of CO emissions using IASI retrievals gives a total of 643 Tg, which is in close agreement with the budget calculated with version 3 of the MOPITT data (649 Tg). The regional totals are also broadly consistent between the two inversions. Even though our theoretical error budget indicates that IASI constrains the emissions slightly less than MOPITT, because of lesser sensitivity in the lower troposphere, these first results indicate that IASI may play a major role in the quantification of the emissions of CO.

Final-revised paper