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Latitudinal variations of CO and OCS in the lower atmosphere of Venus from near-infrared nightside spectro-imaging

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Marcq, Emmanuel; Bézard, Bruno; Encrenaz, Thérèse; Birlan, Mirel

Editorial: Icarus, 179, p.375-386, 2005.

Rezumat:

Spectro-imaging of Venus’ nightside in the 2.3-mum window provides a powerful means of probing the lower atmosphere in the 25 40 km altitude range. We present observations recorded at the NASA/IRTF in February 2003 and August 2004, using the SpeX spectro-imager in the 2.1 2.5-mum region. Abundances of CO and OCS have been derived as a function of latitude for different longitudes. The CO abundance increases by about 15% between the equatorial region and higher latitudes (±40°). No longitudinal or temporal variations are observed. The OCS abundance shows the opposite variation in observational sets with sufficient S/N. These variations and anticorrelation are consistent with upwelling motions in the equatorial region and downwelling at higher latitudes.

Cuvinte cheie: atmosphere, Venus, near-IR spectroscopy