Compositional studies below the clouds from VIRTIS-H nightside spectra in the 2.3-μm window.

Details Compositional studies below the clouds from VIRTIS-H nightside spectra in the 2.3-μm window. Compositional studies below the clouds from VIRTIS-H nightside spectra in the 2.3-μm window.

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..968m&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

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Since the discovery in the early 80s of the thermal emission of Venus which escapes from the thick CO2 atmosphere in a few narrow spectral windows, only Venus Express has carried spectral imaging devices - such as VIRTIS - able to observe it. Among these spectral windows, the 2.3-μm is of paramount interest, since it is one of the only investigation vector enabling the study of the composition of the atmosphere in the 30 - 40 km altitude range thanks to the spectral signatures of several key minor species (CO, OCS, H2O, HDO, SO2, HF). Local or temporal variations in the composition may be caused by global-scale dynamics (especially vertical circulation for CO and OCS because of their vertical mixing ratios gradients) and/or possible geological activity (expected enrichment H2O and SO2, as well as a local modification of water D/H ratio since recently outgassed water vapour would have an isotopic ratio much closer to the primordial value). Since 2003, we have been developping analysis methods suited to medium resolution (R 2000) spectra - using SpeX/IRTF as a benchmark - and have applied these methods to VIRTIS-H data from the first 300 orbits. The results confirm our preliminary ground-based findings from SpeX: we observe an enhancement in CO towards the high southern latitudes of about 25 % between 0 degree and 60 degree S, as well as a correlated depletion of OCS. Water vapour mixing ratio appears constant around 30±5 ppmv at 35 km. Current studies include further analysis of these spectra (vertical gradient determinations for CO and OCS, D/H ratio of water vapour) as well as dynamical interpretation of the latitudinal variations of carbon monoxide and carbonyl sulfide.

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