Kiruna '96: N2O-Measurements

The N2O line at 276.328 GHz is difficult to detect because the maximum of the volume mixing ratio of N2O is below 20 km. This results in a weak heavily pressure broadened signature. In the raw spectra such extremly broadened lines can hardly be distinguished from the sinusoidal undulations caused by standing waves. Only in the corrected spectrum the signature of N2O is discernible.

Raw (black) and corrected (red) spectrum of N2O and O3 from March 31.

Inverted N2O profile. In comparison to the standard profile (first guess) there is less N2O in the middle stratosphere.

Ozone profile retrieved within the same inversion (for more information about the joint retrieval of stratospheric trace gases see Kuntz et al.).

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