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PV: Plenarvorträge

PV X

PV X: Plenary Talk

Wednesday, March 20, 2002, 14:30–15:00, HS 19

Infrared Spectroscopy and the Atmosphere — •Jean-Marie Flaud — Laboratoire de Photophysique Molèculaire, CNRS, Université de P-Sud, Bat. 350, 91405, Orsay Cedex, France — Träger des Gentner-Kastler-Preises

In the next few years various optical remote sensing intruments working in the middle and thermal infrared such as MIPAS (Michelson Interferometer for Passive Atmospheric Sounding), TES (Tropospheric Emission Spectrometer), … will be in operation. These instruments cover wide spectral ranges at rather high spectral resolutions with excellent signal to noise ratios. The analysis of the corresponding atmospheric spectra uses the spectral parameters (line positions, intensities, widths, …) included in databases such as HITRAN, GEISA, … which are derived from experimental and/or theoretical spectroscopic studies. Obviously the accuracy of the retrieved profiles depends highly on the quality of the spectroscopic parameters. This has led to a renaissance of spectroscopy. Indeed, given the improved capabilities (higher spectral resolution, better signal to noise ratio, …) of the new instruments, it is clear that new laboratory studies using the best experimental techniques and/or sophisticated theoretical models are required. During this lecture, after a short presentation of a remote sensing satellite experiment and its needs, some examples dealing with recent progress pertaining to the spectroscopic properties of molecules such as ClONO2, HOCl, HNO3,… will be presented emphasizing the difficulties of the laboratory work and the need of using the most recent experimental and theoretical methods. In parallel the consequences of these findings on atmospheric retrievals will be stressed.