The GEISA Database 2009 Edition: Update Description and Assessment of Spectroscopic Parameters Through Hyperspectral Remote Sensing Applications
| Main Authors: | Jacquinet, N., Crépeau, L., Capelle, V., Scott, N., Armante, R., Chédin, A. |
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| Format: | info Proceeding Journal |
| Terbitan: |
, 2010
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/18011 |
Daftar Isi:
- The updated 2009 edition of GEISA1 (Gestion et Etude des Informations Spectroscopiques Atmosphriques; Management and Study of Atmospheric Spectroscopic Information), a computer-accessible system comprising three independent sub-databases devoted respectively to: line transition parameters, infrared and ultraviolet/visible absorption cross-sections, microphysical and optical properties of atmospheric aerosols will be summarized. In this edition, 50 molecules are involved in the line transition parameters sub-database, including 111 isotopes, for a total of 3,807,997 entries, in the spectral range from 10−6 to 35,877.031 cm−1. The successful performances of the new generation of hyperspectral sounders depend ultimately on the accuracy to which the spectroscopic parameters of the optically active atmospheric gases are known, since they constitute an essential input to the forward radiative transfer models that are used to interpret their observations. Currently, GEISA is involved in activities related to the assessment of the capabilities of IASI (Infrared Atmospheric Sounding Interferometer on board the METOP European satellite http://earthsciences. cnes.fr/IASI) through the GEISA/IASI database2 derived from GEISA. Since the Metop (http://www.eumetsat.int) launch (October 19th 2006), GEISA/IASI is the reference spectroscopic database for the validation of the level-1 IASI data, using the 4A radiative transfer model3 (4A/LMD http://ara.lmd.polytechnique.fr; 4A/OP codeveloped by LMD and Noveltis http://www.noveltis.fr, with the support of CNES). Also, GEISA is involved in planetary research, i.e.: modelling of Titans atmosphere, in the comparison with observations performed by Voyager, or by ground-based telescopes, and by the instruments on board the Cassini-Huygens mission. Highlights will be given on a selection of problems that pertains to current status of the line parameters affecting IASI hyperspectral remote sensing applications. A special effort has been given in the validation of the updated parameters and the evaluation of the subsequent impact on radiative transfer simulations. Results of comparisons ”calcobs” based on IASI observations and 4AOP simulations will be presented. GEISA, continuously developed and maintained at LMD (Laboratoire de M ́et ́eorologie Dynamique, France) since 1976, is implemented on the CNES/CNRS (France) ”Ether” Products and Services Centre WEB site (http://ether.ipsl.jussieu.fr), where all archived spectroscopic data can be handled through general and user friendly associated management software facilities. More than 350 researchers are registered for on line use of GEISA.
- Session I-2.