Articles | Volume 9, issue 2
Atmos. Chem. Phys., 9, 413–442, 2009

Special issue: MIPAS (Michelson Interferometer for Passive Atmosphere Sounding):...

Atmos. Chem. Phys., 9, 413–442, 2009

  19 Jan 2009

19 Jan 2009

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

S. Payan1, C. Camy-Peyret1, H. Oelhaf2, G. Wetzel2, G. Maucher2, C. Keim2, M. Pirre3, N. Huret3, A. Engel4, M. C. Volk4, H. Kuellmann5, J. Kuttippurath5,*, U. Cortesi6, G. Bianchini6, F. Mencaraglia6, P. Raspollini6, G. Redaelli7, C. Vigouroux8, M. De Mazière8, S. Mikuteit2, T. Blumenstock2, V. Velazco5, J. Notholt5, E. Mahieu9, P. Duchatelet9, D. Smale10, S. Wood10, N. Jones11, C. Piccolo12, V. Payne13, A. Bracher5, N. Glatthor2, G. Stiller2, K. Grunow14, P. Jeseck1, Y. Te1, and A. Butz15 S. Payan et al.
  • 1Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique, Université Pierre et Marie Curie-Paris 6, Paris, France
  • 2Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Karlsruhe, Germany
  • 3Laboratoire de Physique et Chimie de l'Environnement/CNRS, Orléans, France
  • 4Institut für Atmosphäre und Umwelt, J. W. Goethe Universität Frankfurt, Frankfurt, Germany
  • 5Institute of Environmental Physics/Institute of Remote Sensing, University of Bremen, Bremen, Germany
  • 6Istituto di Fisica Applicata "Nello Carrara", Sesto Fiorentino, Italy
  • 7Università di L'Aquila, Dipartimento di Fisica, L'Aquila, Italy
  • 8Belgian Institute for Space Aeronomy, Brussels, Belgium
  • 9Institut d'Astrophysique et de Géophysique, University of Liège (ULg), Liège, Belgium
  • 10National Institute for Water and Atmospheric Research (NIWA), Lauder, Otago, New Zeeland
  • 11University of Wollongong, Wollongong, Australia
  • 12Atmospheric, Oceanic and Planetary Physics, Department of Physics, Oxford University, Oxford, UK
  • 13Atmospheric and Environmental Research, Inc, Lexington, Massachusetts, USA
  • 14Meteorologisches Institut der FU Berlin, Berlin, Germany
  • 15Institut für Umweltphysik, University of Heidelberg, Germany
  • *now at: Laboratoire de Météorologie Dynamique, Ecole Polytechnique, Palaiseau, France

Abstract. 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.

Final-revised paper