A portable infrared laser spectrometer for flux measurements of trace gases at the geosphere-atmosphere interface

Christophe Guimbaud 1 Valéry Catoire 1 Sébastien Gogo 2 C. Robert 1 M. Chartier 1 Fatima Laggoun-Défarge 2 A. Grossel 3 Patrick Albéric 2 L. Pomathiod 1 Bernard Nicoullaud 3 Guy Richard 3
1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
2 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
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 : fertilized soils infrared spectroscopy quantum cascade lasers SPIRIT CH4 N2O flux measurements chamber method peatlands water bodies
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Christophe Guimbaud, Valéry Catoire, Sébastien Gogo, C. Robert, M. Chartier, et al.. A portable infrared laser spectrometer for flux measurements of trace gases at the geosphere-atmosphere interface. Measurement Science and Technology, IOP Publishing, 2011, 22 (7), pp.1-17. ⟨10.1088/0957-0233/22/7/075601⟩. ⟨insu-00595203⟩

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