Technical Note: REFIR-PAD level 1 data analysis and performance characterization

The outgoing long-wave radiation from the Earth's atmosphere in the far infrared spectral region is mostly unexplored, while is well recognized that the water vapour contribution to greenhouse trapping is dominant in this region. The Radiation Explorer in the Far InfraRed (RE- FIR) study has proven the feasibility of a space-borne Fourier transform spectrometer able to perform the measurement in the 100-1100 cm 1 range with a resolution of 0.5 cm 1 . Fol- lowing this work a prototype of the spectrometer named REFIR-PAD (Prototype for Applications and Development) has been developed to observe the atmospheric radiance from both ground-based sites and from stratospheric balloon plat- forms. In this work we describe the REFIR-PAD level 1 data analysis procedure, that, starting from raw instrumental data produces the calibrated atmospheric spectral radiance. Per- formances of the procedure are also described.

[1]  Luca Palchetti,et al.  Wide-band spectrally resolved measurement of the Earth's up-welling radiation with the REFIR-PAD spectroradiometer , 2006, SPIE Remote Sensing.

[2]  John E. Harries,et al.  Water vapour and greenhouse trapping: The role of far infrared absorption , 1995 .

[3]  L. Palchetti,et al.  Design and mathematical modelling of the space-borne far-infrared Fourier transform spectrometer for REFIR experiment , 1999 .

[4]  Luca Palchetti,et al.  A wide-band nadir-sounding spectroradiometer for the characterization of the Earth's outgoing long-wave radiation , 2006, SPIE Remote Sensing.

[5]  U. Cortesi,et al.  Measurement of the water vapour vertical profile and of the Earth's outgoing far infrared flux , 2007 .

[6]  John C Brasunas.  Phase anomalies in fourier-transform spectrometers: an absorbing beam splitter is neither sufficient nor necessary. , 2002, Applied optics.

[7]  C. D. Porter,et al.  Correction of phase errors in fourier spectroscopy , 1983 .

[8]  B Carli,et al.  Design of an efficient broadband far-infrared Fourier-transform spectrometer. , 1999, Applied optics.

[9]  J W Brault,et al.  New approach to high-precision Fourier transform spectrometer design. , 1996, Applied optics.

[10]  H. B. Howell,et al.  Radiometric calibration of IR Fourier transform spectrometers: solution to a problem with the High-Resolution Interferometer Sounder. , 1988, Applied optics.

[11]  E. Pascale,et al.  Cosmic-ray spikes localization and correction in FT spectrometer data , 2002 .

[12]  L. Mertz,et al.  Auxiliary computation for Fourier spectrometry , 1967 .

[13]  Luca Palchetti,et al.  Technical note: First spectral measurement of the Earth's upwelling emission using an uncooled wideband Fourier transform spectrometer , 2006 .

[14]  G Bianchini,et al.  Flight qualification of a diode laser for path difference determination of a high-resolution fourier transform spectrometer. , 2000, Applied optics.

[15]  F. Castagnoli,et al.  Design and characterisation of black-body sources for infrared wide-band Fourier transform spectroscopy , 2008 .