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Titel |
New Absorption Bands of the Carbon Dioxide Isotopologues in Venus Spectra |
VerfasserIn |
Séverine Robert, Arnaud Mahieux, Valerie Wilquet, Rachel Drummond, Ann-Carine Vandaele, Yu. Borkov, V. I. Perevalov, S. A. Tashkun, Jean-Loup Bertaux |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250038918
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Zusammenfassung |
We present 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 preliminary results will be
discussed.
So far we have identified the 20001 – 00001 band of 16O13C18O isotopologue and the
21101 – 01101 band of 16O12C18O isotopologue in the SOIR spectra. Rotational
analyses were performed for these two new bands and also for the 01111 - 00001
band of 16O12C18O, already reported in [1]. Additional bands are under analysis as
well.
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1. 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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