The measurement campaign in 1999 at Kiruna (67.84°N, 20.41°E, 425 m MSL), Sweden, lasted
from 22 February to
31 March and spectra of the stratospheric
trace gases ClO, O3 and HNO3
in the frequency range from 268 GHz to
279 GHz were measured.
The inversion was performed with modified Tikhonov-Phillips-Regularization and Optimal
Estimation Method. In the
following a selection of spectra and inverted profiles is presented.