ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-7-12349-2007 Validation of 525 nm and 1020 nm aerosol extinction profiles derived from ACE imager data: comparisons with GOMOS, SAGE II, SAGE III, POAM III, and OSIRIS Vanhellemont F. 1 Tetard C. 2 Bourassa A. 3 Fromm M. 4 Dodion J. 1 Fussen D. 1 Brogniez C. 2 Gilbert K. L. 5 Turnbull D. N. 5 Bernath P. 5 6 Boone C. 5 Walker K. A. 5 7 Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180, Brussels, Belgium LOA, Université de Science et Technologies de Lille, Bâtiment P5, F-59655 Villeneuve d'�Ascq Cedex, France University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada Naval Research Lab, 4555 Overlook Ave. SW, Washington, DC 20375 USA Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada 21 08 2007 7 4 12349 12379 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/7/12349/2007/acpd-7-12349-2007.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/7/12349/2007/acpd-7-12349-2007.pdf

The Canadian ACE (Atmospheric Chemistry Experiment) mission is dedicated to the retrieval of a large number of atmospheric trace gas species using the solar occultation technique in the infrared and UV/visible spectral domain. However, two additional solar disk imagers (at 525 nm and 1020 nm) were added for a number of reasons, including the retrieval of aerosol and cloud products. In this paper, we present the first validation results for these imager aerosol/cloud optical extinction coefficient profiles, by intercomparison with profiles derived from measurements performed by 3 solar occultation instruments (SAGE II, SAGE III, POAM III), one stellar occultation instrument (GOMOS) and one limb sounder (OSIRIS). The results indicate that the ACE imager profiles are of good quality in the upper troposphere/lower stratosphere, although the aerosol extinction for the visible channel at 525 nm contains a significant negative bias at higher altitudes, while the profiles are systematically too high at 1020 nm. Both problems are probably related to ACE imager instrumental issues.

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