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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
17 Oct 2016
Review status
A revision of this discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Merged ozone profiles from four MIPAS Processors
Alexandra Laeng1, Thomas von Clarmann1, Gabriele Stiller1, Bianca Maria Dinelli2, Anu Dudhia3, Piera Raspollini4, Norbert Glatthor1, Udo Grabowski1, Viktoria Sofieva5, Lucien Froidevaux6, Kaley Walker7, and Claus Zehner8 1Institut für Meteorologie und Klimaforschung, Karlsruhe Institute of Technology, Karlsruhe, Germany
2ISAC-CNR Bologna, Bologna, Italy
3Earth Observation Data Group, Oxford University, UK
4IFAC-CNR Firenze, Florence, Italy
5Finnish Meteorological Institute, Helsinki, Finland
6Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA
7University of Toronto, Toronto, Canada
8ESA ESRIN, Frascati, Italy
Abstract. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) was an infrared limb emission spectrometer on the Envisat platform. Currently, there are four MIPAS ozone data products, including operational Level-2 ozone product processed at ESA with the scientific prototype processor being operated at IFAC Florence and three independent research products: ISACCNR/University of Bologna, Oxford University and KIT-IMK/IAA. Here we present a dataset of ozone vertical profiles obtained by merging ozone retrievals from four independent Level 2 MIPAS Processors. We also discuss the advantages and the shortcomings of this merged product. As the four processors retrieve ozone in different parts of the spectra (microwindows), source measurements can be considered as nearly independent. The information content of the merged product is hence more important. The precision of the merged product is better than that of any parent dataset.

The merging is performed on profile per profile base. Parent ozone profiles are weighted based on the corresponding covariance matrices, the correlations between different profile levels are taken into account. The intercorrelations between the processors’ errors are evaluated statistically and are used in the merging. The height range of the merged product is 20–55 km, and statistical covariance matrices are provided as diagnostics. Validation of the merged dataset is performed by comparing it with ozone profiles from ACE-FTS and MLS. Even though the merging is not supposed to remove the bias, around the ozone volume mixing ratio peak the merged product has a smaller (up to 0.1 ppmv) bias with respect to ACE-FTS than any of the parent datasets. The bias with respect to MLS is of the order of 0.15 ppmv at 20–30 km height, and up to 0.45 ppmv at larger altitudes. Comparison with ACE-FTS looks better than with MLS, however this is the case for all parent processors as well.

Citation: Laeng, A., von Clarmann, T., Stiller, G., Dinelli, B. M., Dudhia, A., Raspollini, P., Glatthor, N., Grabowski, U., Sofieva, V., Froidevaux, L., Walker, K., and Zehner, C.: Merged ozone profiles from four MIPAS Processors, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-239, in review, 2016.
Alexandra Laeng et al.
Alexandra Laeng et al.
Alexandra Laeng et al.


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Publications Copernicus
Short summary
MIPAS instrument flown in 2002–2012 on Envisat satellite and measured atmospheric composition. There exist four processors retrieving atmospheric profiles from MIPAS spectra. We performed mathematically clean merging of 2007–2008 datasets of ozone from these four processors. The merged product was compared with ozone datasets from ACE-FTS and MLS instruments. The advantages and the shortcomings of this merged product are discussed.
MIPAS instrument flown in 2002–2012 on Envisat satellite and measured atmospheric composition....