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1 LPCE - Laboratoire de physique et chimie de l-environnement 2 ISTO - Institut des Sciences de la Terre d-Orléans 3 INRA - Unité Science du Sol

Abstract : A portable infrared laser absorption spectrometer named SPIRIT SPectrom-etre Infra-Rouge In situ Troposph-erique has been set up for the simultaneous flux measurements of trace gases at the geosphere-atmosphere interface. It uses a continuous wave distributed feedback room temperature quantum cascade laser and a patented new optical multi-pass cell. The aim of SPIRIT field studies is to get a better understanding of land and water bodies to atmosphere exchange mechanisms of greenhouse gases GHG. The analytical procedures to derive concentrations and fluxes are described, as well as the performances of the instrument under field conditions. The ability of SPIRIT to assess space and time dependence emissions of two GHG-nitrous oxide N2O and methane CH4-for different types of ecosystems is demonstrated through in situ measurements on peatland, on fertilized soil, and on water body systems. The objectives of these investigations and preliminary significant results are reported.

Keywords : infrared spectroscopy quantum cascade lasers SPIRIT CH4 N2O flux measurements chamber method peatlands water bodies fertilized soils





Autor: Christophe Guimbaud - Valery Catoire - Sébastien Gogo - C. Robert - M. Chartier - Fatima Laggoun-Défarge - A. Grossel - Patrick

Fuente: https://hal.archives-ouvertes.fr/



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