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Volume 11, issue 8 | Copyright

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Meas. Tech., 11, 4693-4705, 2018
https://doi.org/10.5194/amt-11-4693-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Aug 2018

Research article | 10 Aug 2018

On the improved stability of the version 7 MIPAS ozone record

Alexandra Laeng1, Ellen Eckert1, Thomas von Clarmann1, Michael Kiefer1, Daan Hubert2, Gabriele Stiller1, Norbert Glatthor1, Manuel López-Puertas3, Bernd Funke3, Udo Grabowski1, Johannes Plieninger1, Sylvia Kellmann1, Andrea Linden1, Stefan Lossow1, Arne Babenhauserheide1, Lucien Froidevaux4, and Kaley Walker5 Alexandra Laeng et al.
  • 1Institut für Meteorologie und Klimaforschung, Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 2Belgian Institute for Space Aeronomy (BIRA-IASB), Synergistic exploitation of atmospheric data, Brussels, Belgium
  • 3Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA
  • 5Department of Physics, Toronto, University of Toronto, Canada

Abstract. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) was an infrared limb emission spectrometer on the Envisat platform. From 2002 to 2012, it performed pole-to-pole measurements during day and night, producing more than 1000 profiles per day. The European Space Agency (ESA) recently released the new version 7 of Level 1B MIPAS spectra, in which a new set of time-dependent correction coefficients for the nonlinearity in the detector response functions was implemented. This change is expected to reduce the long-term drift of the MIPAS Level 2 data. We evaluate the long-term stability of ozone Level 2 data retrieved from MIPAS v7 Level 1B spectra with the IMK/IAA scientific level 2 processor. For this, we compare MIPAS data with ozone measurements from the Microwave Limb Sounder (MLS) instrument on NASA's Aura satellite, ozonesondes and ground-based lidar instruments. The ozonesondes and lidars alone do not allow us to conclude with enough significance that the new version is more stable than the previous one, but a clear improvement in long-term stability is observed in the satellite-data-based drift analysis. The results of ozonesondes, lidars and satellite drift analysis are consistent: all indicate that the drifts of the new version are less negative/more positive nearly everywhere above 15km. The 10-year MIPAS ozone trends calculated from the old and the new data versions are compared. The new trends are closer to old drift-corrected trends than the old uncorrected trends were. From this, we conclude that the nonlinearity correction performed on Level 1B data is an improvement. These results indicate that MIPAS data are now even more suited for trend studies, alone or as part of a merged data record.

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MIPAS was an IR limb emission spectrometer on the Envisat platform. From 2002 to 2012, it performed pole-to-pole measurements of ozone during day and night. ESA recently released the new version 7 of Level 1 MIPAS spectra, which is expected to reduce the long-term drift of the MIPAS Level 2 data. We evaluate the long-term stability of ozone Level 2 data from the KIT IMK processor. Our results indicate that MIPAS data are now even more suited for trend studies, alone or as part of merged data.
MIPAS was an IR limb emission spectrometer on the Envisat platform. From 2002 to 2012, it...
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