Two infrared laser spectrometers for the in situ measurement of stratospheric gas concentration

This paper presents two infrared laser spectrometers built to measure CH4, N2O and CO stratospheric concentrations. Both TDL were designed as a subsystem of a composite airborne instruments package, devoted to the chemical and microphysical diagnostics of stratospheric aerosols, developed in the frame of the Airborne Platform for Earthobservation programme (APE). We present the results of the measurements of N2O and CH4 concentration in the stratosphere performed in a polar campaign on board of the Geophysica M55 aircraft.