Computer Science – Sound
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..245c&link_type=abstract
In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:
Computer Science
Sound
Earth Atmosphere, Balloons
Scientific paper
Atmospheric nadir sounding from space using Fourier transform infrared (FTIR) spectroscopy is becoming a mature technique for both global coverage and good vertical resolution in the troposphere and lower stratosphere. The Infrared Atmospheric Sounding Interferometer (IASI) has been developed by CNES, with Alcatel as the industrial prime contractor, for operation on board the series of European polar orbit meteorological satellites Metop under the overall responsibility of EUMETSAT (first launch end of 2005). In parallel to this international project, a balloon payload has been developed accommodating a Bomem DA2 FTIR instrument operating as a spectro-radiometer based on the 2 blackbody (BB) complex plane calibration technique. The thermal emission spectrum (radiance spectrum) of the atmosphere/surface/cloud system in the region 650-3000 cm-1 is covered at 0.1 cm-1 resolution and 0.4K radiometric precision through co-addition of interferograms (recorded simultaneously) by liquid nitrogen cooled HgCdTe and InSb detectors). A measurement cycle of about 100 s involves hot and cold BB views bracketing the acquisition of nadir looking scenes. Through the combined use of a scan mirror (1st horizontal rotation axis) and azimuth control of the gondola (2nd vertical roation axis), the FTIR can record spectra of fixed targets (IFOV between 600 m and 1000 m on the ground depending on float altitude usually in the range 30 to 40 km) accounting for the usual drift of stratospheric balloons. The performances of the FTIR are discussed in relation to the retrieval of information on the column and/or vertical distribution of tropospheric trace species like H2O, CO2, CO, O3, N2O and others.
Camy-Peyret Claude
Evrard Jean
Jeseck P.
Payan Sébastien
Té Y.
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