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    Geophysical validation of temperature retrieved by the ESA processor from MIPAS/ENVISAT atmospheric limb-emission measurements

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    Authors
    Ridolfi, M.
    Blum, U.
    Carli, B.
    Catoire, V.
    Ceccherini, S.
    Claude, H.
    De Clercq, C.
    Fricke, K.H.
    Friedl-Vallon, F.
    Iarlori, M.
    Keckhut, P.
    Kerridge, B.
    Lambert, J.-C.
    Meyer, Y.J.
    Mona, L.
    Oelhaf, H.
    Pappalardo, G.
    Pirre, M.
    Rizi, V.
    Robert, C.
    Swart, D.
    Von Clarmann, T.
    Waterfall, A.
    Wetzel, G.
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    Discipline
    Physical sciences
    Subject
    data set
    emission
    Envisat-1
    geophysics
    measurement method
    model validation
    remote sensing
    temperature
    Audience
    Scientific
    Date
    2007
    Metadata
    Show full item record
    Description
    The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) has been operating since March 2002 onboard of the ENVlronmental SATellite of the European Space Agency (ESA). The high resolution (0.035 cm-1 full width half maximum, unapodized) limb-emission measurements acquired by MIPAS in the first two years of operation have very good geographical and temporal coverage and have been re-processed by ESA with the most recent versions (4.61 and 4.62) of the inversion algorithms. The products of this processing chain are pressures at the tangent points and geolocated profiles of temperature and of the volume mixing ratios of six key atmospheric constituents: H2O, O3, HNO3, CH4, N2O and NO 2. As for all the measurements made with innovative instruments and techniques, this data set requires a thorough validation. In this paper we present a geophysical validation of the temperature profiles derived from MIPAS measurements by the ESA retrieval algorithm. The validation is carried-out by comparing MIPAS temperature with correlative measurements made by radiosondes, lidars, insitu and remote sensors operated either from the ground or stratospheric balloons. The results of the intercomparison indicate that the bias of the MIPAS profiles is generally smaller than 1 or 2 K depending on altitude. Furthermore we find that, especially at the edges of the altitude range covered by the MIPAS scan, the random error estimated from the intercomparison is larger (typically by a factor of two to three) than the corresponding estimate derived on the basis of error propagation. In this work we also characterize the discrepancies between MIPAS temperature and the temperature fields resulting from the analyses of the European Centre for Mediumrange Weather Forecasts (ECMWF). The bias and the standard deviation of these discrepancies are consistent with those obtained when comparing MIPAS to correlative measurements; however, in this case the detected bias has a peculiar behavior as a function of altitude. This behavior is very similar to that observed in previous studies and is suspected to be due to vertical oscillations in the ECMWF temperature.The current understanding is that, at least in the upper stratosphere (above ≈ l0hPa), these oscillations are caused by a discrepancy between model biases and biases of assimilated radiances from primarily nadir sounders.
    Citation
    Ridolfi, M.; Blum, U.; Carli, B.; Catoire, V.; Ceccherini, S.; Claude, H.; De Clercq, C.; Fricke, K.H.; Friedl-Vallon, F.; Iarlori, M.; Keckhut, P.; Kerridge, B.; Lambert, J.-C.; Meyer, Y.J.; Mona, L.; Oelhaf, H.; Pappalardo, G.; Pirre, M.; Rizi, V.; Robert, C.; Swart, D.; Von Clarmann, T.; Waterfall, A.; Wetzel, G. (2007). Geophysical validation of temperature retrieved by the ESA processor from MIPAS/ENVISAT atmospheric limb-emission measurements. , Atmospheric Chemistry and Physics, Vol. 7, Issue 16, 4459-4487, DOI: 10.5194/acp-7-4459-2007.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4393
    doi: http://dx.doi.org/10.5194/acp-7-4459-2007
    scopus: 2-s2.0-34548226551
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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