Abstract
Abstract. Ground-based Fourier Transform Infra-Red (FTIR) measurements are an important component of the global atmospheric monitoring system. Their essential role in validating satellite measurements requires a precise documentation of their quality. Here we present an extensive quality documentation of ground-based FTIR O3 profiles. This is done in the form of theoretical and empirical error estimations. The latter is achieved by an intercomparison with ECC-sonde O3 profiles. The FTIR O3 amounts are obtained by applying the most advanced instrumentation and retrieval strategies and consequently represent the current potential of this remote sensing technique.
Highlights
Ground-based measurements of highly-resolved infrared solar absorption spectra allow ongoing detection of the composition of the atmosphere in a cost-effective manner. They are essential for long-term monitoring and for validating satellite measurements and, they are a vital component of the global atmospheric monitoring system
In the stratosphere the natural variability is of a similar magnitude (5–10%), and the normalisation to the Brewer data significantly improves the correlation between Fourier Transform Infra-Red (FTIR) and ECC partial columns (compare panel (c) of Fig. 10 and 8)
The altitude range with the best vertical resolution coincides with the tropopause region
Summary
Ground-based measurements of highly-resolved infrared solar absorption spectra allow ongoing detection of the composition of the atmosphere in a cost-effective manner They are essential for long-term monitoring and for validating satellite measurements and, they are a vital component of the global atmospheric monitoring system. Similar validation studies of ground-based FTIR O3 profiles have already been performed by different authors (Pougatchev et al, 1996; Nakajima et al, 1997; Barret et al, 2002; Schneider et al, 2005a; Kagawa et al, 2007) In some of these works the empirical validation is performed for a very reduced number of sonde-FTIR coincidences, which are measured within a short time range during specific campaigns.
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