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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 6, 15-32, 2013
http://www.atmos-meas-tech.net/6/15/2013/
doi:10.5194/amt-6-15-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Jan 2013
Improving retrieval quality for airborne limb sounders by horizontal regularisation
J. Ungermann 1Institute of Energy and Climate Research – Stratosphere (IEK-7), Research centre Jülich GmbH, Jülich, Germany
2National Center for Atmospheric Research, Boulder, Colorado, USA
Abstract. Modern airborne infrared limb sounders are capable of measuring profiles so fast that neighbouring profiles are very similar to one another. This can be exploited by retrieving whole 2-D cross-sections instead of simple 1-D profiles.

This paper presents algorithms that are able to perform such a large-scale retrieval and that efficiently produce typical diagnostic quantities. The characteristics and capabilities of the proposed method are analysed and demonstrated in a detailed case study using a series of profiles that were measured by CRISTA-NF (Cryogenic Infrared Spectrometers and Telescope for the Atmosphere–New Frontiers).

It is shown that cross-section retrievals can either reduce noise-induced artefacts or produce finer vertical structures while maintaining the same image noise level. Further, it is discussed how the presented methodology can also be applied to improve the retrievals for other instrument types including current satellite-borne nadir-sounders and near-future satellite-borne limb sounders.


Citation: Ungermann, J.: Improving retrieval quality for airborne limb sounders by horizontal regularisation, Atmos. Meas. Tech., 6, 15-32, doi:10.5194/amt-6-15-2013, 2013.
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