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Validation of version-4.61 methane and nitrous oxide observed by MIPAS

By Sébastien Payan, Claude C. Camy-Peyret, Hermann Oelhaf, Gerald Wetzel, Guido Maucher, Corneli Keim, Michel Pirre, Nathalie Huret, Andreas Engel, C.-Michael Volk, Harry Kuellmann, Jayanarayanan Kuttippurath, Ugo Cortesi, Giovanni Bianchini, Francesco Mencaraglia, Piera Raspollini, Gianluca Redaelli, Corinne Vigouroux, Martine De Mazière, Sabine Mikuteit, Thomas Blumenstock, Voltaire Velazco, Justus Notholt, Emmanuel Mahieu, Pierre Duchatelet, Dan Smale, Stephen Wood, Nicholas Jones, Chiara Piccolo, Vivienne Payne, Astrid Bracher, Norbert Glatthor, Gabriele Stiller, Katja Grunow, Pascal Jeseck, Yao Te and Andre Butz


The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61, full resolution MIPAS data covering the period 9 July 2002 to 26 March 2004) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. In the middle stratosphere, no significant bias is observed between MIPAS and correlative measurements, and MIPAS is providing a very consistent and global picture of the distribution of CH4 and N2O in this region. In average, the MIPAS CH4 values show a small positive bias in the lower stratosphere of about 5%. A similar situation is observed for N2O with a positive bias of 4%. In the lower stratosphere/upper troposphere (UT/LS) the individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61 and the estimated errors of the correlative measurements

Topics: ddc:550
Year: 2009
OAI identifier:

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