Atmos. Chem. Phys. Discuss., 10, 14445-14494, 2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
IASI carbon monoxide validation over the Arctic during POLARCAT spring and summer campaigns
M. Pommier1, K. S. Law1, C. Clerbaux1,3, S. Turquety2, D. Hurtmans3, J. Hadji-Lazaro1, P.-F. Coheur3, H. Schlager4, G. Ancellet1, J.-D. Paris5, P. Nédélec6, G. S. Diskin7, J. R. Podolske8, J. S. Holloway9,10, and P. Bernath11,12
1UPMC Univ. Paris 06; Université Versailles St-Quentin; CNRS/INSU, UMR 8190, LATMOS-IPSL, Paris, France
2UPMC Univ. Paris 06; Ecole Polytechnique; CNRS UMR 8539, LMD-IPSL, Palaiseau, France
3Spectroscopie de l'Atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium
4DLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
6Université de Toulouse, UPS, LA (Laboratoire d'Aérologie), CNRS UMR 5560, Toulouse, France
7NASA Langley Research Center, MS 483, Hampton, USA
8NASA Ames Research Center, Moffett Field, California, 94035, USA
9Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, Colorado, USA
10Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
11Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
12Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK

Abstract. In this paper, we provide a detailed comparison between carbon monoxide (CO) data measured by the Infrared Atmospheric Sounding Interferometer (IASI)/METOP and aircraft measurements over the Arctic. The CO measurements were obtained during North American campaigns (NASA ARCTAS and NOAA ARCPAC) and European campaigns (POLARCAT-France, POLARCAT-GRACE and YAK-AEROSIB) as part of the International Polar Year (IPY) in spring and summer 2008. During the campaigns different air masses were sampled including clean air, polluted plumes originating from anthropogenic sources in Europe, Asia and North America, and forest fire plumes originating from Siberia and Canada. CO-rich plumes following different transport pathways were captured well by the IASI instrument, illustrated for example by a transport event over the North Pole from Asia on 9 July 2008. The comparison between the IASI CO profiles and aircraft data was achieved by first completing the latter for higher altitudes using a latitudinally dependent climatology of ACE-FTS satellite CO profiles (2004–2009) and by subsequently smoothing the resulting full profiles by the IASI averaging kernels. Proceeding this way, the IASI profiles were shown to be in good agreement with smoothed in situ profiles (with a difference of about 10 ppbv) in spring. In summer, the IASI profiles were higher than the smoothed in situ profiles below 8 km, for all polluted cases. Correlations between IASI and combination ACE-FTS/aircraft derived total columns varied from 0.15 to 0.74 in spring and 0.26 to 0.84 in summer, with better results over the sea in spring (0.73) and over the land in summer (0.69).

Citation: Pommier, M., Law, K. S., Clerbaux, C., Turquety, S., Hurtmans, D., Hadji-Lazaro, J., Coheur, P.-F., Schlager, H., Ancellet, G., Paris, J.-D., Nédélec, P., Diskin, G. S., Podolske, J. R., Holloway, J. S., and Bernath, P.: IASI carbon monoxide validation over the Arctic during POLARCAT spring and summer campaigns, Atmos. Chem. Phys. Discuss., 10, 14445-14494, doi:10.5194/acpd-10-14445-2010, 2010.
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