Journal article

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

Payan S, Camy-Peyret C, Oelhaf H, Wetzel G, Maucher G, Keim C, Pirre M, Huret N, Engel A, Volk M, Kuellmann H, Kuttippurath J, Cortesi U, Bianchini G, Mencaraglia F, Raspollini P, Redaelli G, Vigouroux C, De Mazière M, Mikuteit S, Blumenstock T, Velazco V, Notholt J, Mahieu E, Duchatelet P, Smale D, Wood S, Jones N, Piccolo C, Payne V, Bracher A, Glatthor N, Stiller G, Grunow K, Jeseck P, Te Y, Butz A ...see all

Atmospheric Chemistry and Physics, vol. 9, issue 2 (2009) pp. 413-442

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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.

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  • S. Payan

  • C. Camy-Peyret

  • H. Oelhaf

  • G. Wetzel

  • G. Maucher

  • C. Keim

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