S1 Additional validation of Arctic stratospheric ozone from the
CAMS
reanalysis.
Figure S1 shows a comparison between the CAMS reanalysis and
Fourier-Transform Infrared Spectroscopy (FTIR) observations from the
Network for the Detection of Atmospheric Composition Change (NDACC)
network. A detailed description of the instruments and the applied
methodologies for all NDACC FTIR observations can be found in Langerock
et al. (2015). FTIR measurement techniques are sensitive to the
stratosphere and have a typical uncertainty of 5% for the total column.
Figure S1 illustrates that the CAMS reanalysis TCO3 values show a slight
underestimation against NDACC FTIR data, which is below 10% for most
stations and falls within the measurement uncertainty of 5% for a large
part of the timeseries.