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Validation of six years of SCIAMACHY carbon monoxide observations using MOZAIC CO profile measurements

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Author(s): A. T. J. de Laat | R. Dijkstra | H. Schrijver | P. Nédélec | I. Aben

Journal: Atmospheric Measurement Techniques Discussions
ISSN 1867-8610

Volume: 5;
Issue: 1;
Start page: 1985;
Date: 2012;
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ABSTRACT
This paper presents a validation study of SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) carbon monoxide (CO) total column measurements from the Iterative Maximum Likelihood Method (IMLM) algorithm using vertically integrated profile aircraft measurements obtained within the MOZAIC project for the six year time period of 2003–2008. Overall we find a good agreement between SCIAMACHY and airborne measurements for both mean values – also on a year-to-year basis – as well as seasonal variations. Several locations show large biases that are attributed to local effects like orography and proximity of large emission sources. Differences were detected for individual years: 2003, 2004 and 2006 have larger biases than 2005, 2007 and 2008, which appear to be related to SCIAMACHY instrumental issues but require more research. Results from this study are consistent with, and complementary to, findings from a previous validation study using ground-based measurements (de Laat et al., 2010). Despite the presence of some biases, this study provides additional confidence that SCIAMACHY, if individual measurements are of sufficient quality – good signal-to-noise – can be used to determine the spatial distribution and seasonal cycles of CO total columns.
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