Abstract

Vibration-rotation absorptions in high-resolution Fourier-transform infrared spectra from a 246-m horizontal path were used to derive local concentrations of trace gases at the Alpine observatory at the Zugspitze summit, Germany (2964 m above sea level). The analysis was performed by using the line-by-line nonlinear least-squares spectral fitting software, sfit, based on the 1992 hitran line parameter compilation. (hitran is a high-resolution transmission molecular absorption database.) A comparison to in situ measurements shows an agreement of better than 4.3% for the species CO, CO₂, and CH₄. Using the same spectrometer and analysis software, we obtained the vertical column density of N₂O together with an adjusted vertical volume mixing ratio distribution. This translates to a local N₂O concentration at the altitude of Zugspitze that agrees with the horizontal path-derived value to within 1%.

© 1997 Optical Society of America

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