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| Titel |
Analysis of new Absorption Bands of the Carbon Dioxide Isotopologues in Venus Spectra |
| VerfasserIn |
Séverine Robert, Arnaud Mahieux, Valerie Wilquet, Rachel Drummond, Ann Carine Vandaele, Jean Vander Auwera, Yuri Borkov, Valery I. Perevalov, Sergei A. Tashkun, Jean-Loup Bertaux |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054658
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| Zusammenfassung |
| We present our latest analyses concerning new absorption bands of carbon dioxide
isotopologues detected by the SOIR instrument on board Venus Express. The SOIR
instrument combines an echelle spectrometer and an Acousto-Optical Tunable Filter for the
order selection. It performs solar occultation measurements in the IR region (2.2 – 4.3 μm) at
a resolution of 0.12 – 0.18 cm-1. The wavelength range probed by SOIR allows a detailed
chemical inventory of the Venus atmosphere above the cloud layer (65 to 150 km) with an
emphasis on vertical distribution of the gases.
The sensitivity of the SOIR instrument and the high concentration of CO2 on Venus,
coupled with the long absorption paths sounded during solar occultation, enable us to detect
weak absorption bands of the rare CO2 isotopologues in the Venus atmosphere.
A systematic study of the recorded spectra is under way and first results will be
presented.
The identification of the 20001 – 00001 band of 16O13C18O isotopologue and the 21101
– 01101 band of 16O12C18O isotopologue in the SOIR spectra lead to thorough analyses.
Line intensities and positions were retrieved automatically from numerous spectra, using the
ASIMAT code[1] . Rotational analyses were performed for these two new bands and also for
the 01111 - 00001 band of 16O12C18O, already reported in [2]. Additional bands are under
analysis as well.
1. Mahieux, A., et al., Densities and temperatures in the Venus mesosphere and lower
thermosphere retrieved from SOIR on board Venus Express. Part I. Retrieval technique. J.
Geophys. Res., 2010. 115(E12014).
2. Wilquet, V., et al., Line parameters for the 01111-00001 band of 16O12C18O from
SOIR measurements of the Venus atmosphere. Journal of Quantitative Spectroscopy and
Radiative Transfer, 2008. 109: p. 895-905. |
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