AbstractThe new remote sensing experiment CRISTA-NF (Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere – New Frontiers) successfully participated in the SCOUT-O3 Tropical Aircraft Campaign in November and December 2005. CRISTA-NF operated aboard the high-altitude research aircraft M-55 Geophysica. Mid-infrared spectra (4–15μm) were measured in the limb sounding geometry with high spatial resolution (250m vertical sampling, 5–15km along track sampling). Measurements were carried out during transfer flights between Oberpfaffenhofen, Germany, and Darwin, Australia, as well as during several local flights near Darwin. Water vapor volume mixing ratios in the upper troposphere and lower stratosphere were derived from the CRISTA-NF radiance measurements by utilizing a rapid radiative transfer forward model and the optimal estimation retrieval approach. CRISTA-NF water vapor measurements below the hygropause have a total retrieval error of 15–40% (i.e. root mean square of accuracy and precision). The systematic terms are dominating in the retrieval error budget. The contributions of a priori information to the retrieval results are less than 5–10%. The vertical resolution of the observations is about 250–500m when permitted by instrument sampling. In this paper we present first results for three transfer flights of the campaign. Being generally in good agreement with corresponding ECMWF operational analyzes, the CRISTA-NF measurements show significantly higher variability and local structures in the upper tropospheric water vapor distributions.


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    Titel :

    CRISTA-NF measurements of water vapor during the SCOUT-O3 Tropical Aircraft Campaign


    Beteiligte:
    Hoffmann, L. (Autor:in) / Weigel, K. (Autor:in) / Spang, R. (Autor:in) / Schroeder, S. (Autor:in) / Arndt, K. (Autor:in) / Lehmann, C. (Autor:in) / Kaufmann, M. (Autor:in) / Ern, M. (Autor:in) / Preusse, P. (Autor:in) / Stroh, F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2008-03-13


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch