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Proceedings Paper

Optimized forward and retrieval model for MIPAS near-real-time data processing
Author(s): Marco Ridolfi; Bruno Carli; Massimo Carlotti; Anu Dudhia; Jean-Marie Flaud; Michael Hoepfner; Paul E. Morris; Piera Raspollini; Gabriele P. Stiller; Robert J. Wells
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Paper Abstract

The IR emission limb sounder MIPAS will be operated as an ESA core instrument on the ENVISAT-1 satellite. Near real time retrieval of pressure, temperature and volume mixing ratio of five key species from calibrated spectra will be performed in the Level 2 processor of the ENVISAT Payload Data Segment. In order to develop an optimized retrieval algorithm suitable for the implementation in MIPAS Level 2 processor, an ESA supported study is being carried out. In the framework of this study, an optimized forward/retrieval code based on the global fit approach was implemented. In this approach all the spectra of a limb-scanning sequence are simultaneously fitted, so that error propagation in the altitude domain is avoided. The attained accuracy performances of the retrieval code are the following: (i) temperature accuracy < 2 K at all the altitudes covered by the standard MIPAS scan; (ii) tangent pressure error: < 3 percent; (iii) error on the retrieved VMR of the key species: < 5 percent at most of the latitudes of scientific interest covered by the standard MIPAS scan. The run-time required to perform p,T and VMR retrieval of the five MIPAS target species from a limb-scanning sequence of 16 limb-views is less than 6 minutes on a SUN SPARCstation 20. The most effective code optimization were implemented in the radiative transfer model and in the computation of the jacobian of the retrieval.

Paper Details

Date Published: 18 August 1998
PDF: 16 pages
Proc. SPIE 3501, Optical Remote Sensing of the Atmosphere and Clouds, (18 August 1998); doi: 10.1117/12.317770
Show Author Affiliations
Marco Ridolfi, IROE-CNR (Italy)
Bruno Carli, IROE-CNR (Italy)
Massimo Carlotti, Univ. di Bologna (Italy)
Anu Dudhia, Oxford Univ. (United Kingdom)
Jean-Marie Flaud, Univ. de Paris-Sud (France)
Michael Hoepfner, Forschungszentrum Karlsruhe GmbH (Germany)
Paul E. Morris, Oxford Univ. (United Kingdom)
Piera Raspollini, IROE-CNR (Italy)
Gabriele P. Stiller, Forschungszentrum Karlsruhe GmbH (Germany)
Robert J. Wells, Oxford Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3501:
Optical Remote Sensing of the Atmosphere and Clouds
Jinxue Wang; Beiying Wu; Toshihiro Ogawa; Zheng-hua Guan, Editor(s)

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