Mid-infrared laser sources are powerful tools for in situ measurements of trace gas species by absorption spectroscopy in the atmosphere. Two tunable laser spectrometers, which can operate in harsh environments, have been built during the last ten years at LPC2E (Orléans). The first one, SPIRALE (SPectromètre InfraRouge par Absorption de Lasers Embarqués), is a balloon-borne stratospheric instrument using six lead-salt diodes with a large open-air Herriott multipass absorption cell. The other one, SPIRIT (Spectromètre InfraRouge In situ Toute altitude), benefits from two last technology advances for better performances and miniaturization: quantum cascade lasers operating near room temperature coupled to a new (patented) closed multipass cell. They will be described, together with their measurement principle, advantages and drawbacks. Various examples of results from SPIRALE flights will be given, especially concerning stratospheric chemistry and dynamics at different latitudes, and satellite validations, within the frames of SCOUT-O3, STRAPOLETE, and ENVISAT projects. First results from SPIRIT prototype working at ground will also be presented, in the frame of projects aiming at assessing greenhouse gas emissions by different types of soils (peatlands and cultivated fields). Future applications will be mentioned.

Diese Veranstaltung ist Teil der Reihe Karlsruher Meteorologisches Kolloquium

Referent/in
Dr. Valery Catoire

CNRS, Orléans, Frankreich
LPCE

Veranstalter
IMK-ASF Administration
IMK-ASF
KIT
Karlsruhe
Tel: +49 721 608-28271
E-Mail: sekretariat ∂does-not-exist.imk-asf kit edu

Zielgruppe
Wissenschaftliche Mitarbeitende