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**1. Introduction**

Fourier Transform Spectroscopy with partially scanned interferograms (FTS\*PSI) is a technique to obtain the difference between spectra of atmospheric radiance at two diverse

**Fourier Transform Spectroscopy with Partially** 

**Scanned Interferograms as a Tool to Retrieve** 

**Atmospheric Gases Concentrations from High** 

**Methodological Aspects and Application to IASI** 

**Spectral Resolution Satellite Observations –** 

Carmine Serio1, Guido Masiello1 and Giuseppe Grieco2

*2DIFA, Universitá della Basilicata, Potenza* 

*Italy* 

**11**

*1CNISM, Unitá di Ricerca di Potenza, Universitá della Basilicata, Potenza* 

In the context of infrared remote sensing, the idea of using partially scanned interferograms for the retrieval of atmospheric parameters dates back to Kyle (1977) who argued that large portions of the spectrum (the Fourier transform of the interferogram and vice versa) could bring poor or no information for a given atmospheric parameter, whereas small ranges in the interferogram domain could concentrate much information about the parameter at hand. Kyle (1977) exemplified the technique for temperature, whereas a correlation interferometer was proposed for the observation of atmospheric trace gases by Goldstein et al. (1978). The direct inversion of small segments of interferometric radiances for the purpose of temperature

In some circumstances, according to Kyle (1977) the interferogram domain can provide a data space in which information about the atmospheric thermodynamical state can be encoded much more efficiently than in the spectral domain. Exploiting this idea, Grieco et al. (2010) has shown how to perform a dimensionality reduction of high spectral resolution infrared observations, which preserves the spectral coverage of the original spectrum . Once compared to the usual way of reducing a high amount of spectral data by simply considering a sparse (optimal) selection of the spectral channels, the methodology has shown a better performance

Unlike the previous works by Grieco et al. (2010); Kyle (1977); Smith et al. (1979), which concentrated on the direct use of inteferogram radiances, in this study, we consider the point of transforming back to the spectral domain the partial scanned interferogram, in such a way to obtain a difference spectrum with improved signal-to-noise ratio. This difference spectrum, instead of the partial interferogram, is considered for the retrieval of atmospheric gases.

spectral resolutions (Grieco et al., 2010; 2011; Kyle, 1977; Smith et al., 1979).

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