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| Titel |
Sulfur oxides above Venus' clouds from SPICAV/SOIR VEX occultations |
| VerfasserIn |
D. Belyaev, O. Korablev, A. Fedorova, J.-L. Bertaux, F. Montmessin, E. Marcq, A. Mahieux, X. Zhang |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069910
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| Zusammenfassung |
| We present new results from Venus Express solar occultations in the ranges of SO2
absorption (190-230Â nm, 4Â μm) and SO (190-230Â nm). The dioxide (SO2) was detected by
spectrometer SOIR at altitudes 65-80Â km in the IR and by spectrometer SPICAV at
85-105Â km in the UV. The monoxide’s absorption was measured only by SPICAV UV at
85-105Â km.
Very recent papers about SOx content above Venus’ clouds were published to
describe a presence of several layers of the dioxide abundance (Belyaev et al., 2012;
Zhang et al., 2012). In the lower layer (65-80Â km) SO2 mixing ratio varied around
0.02-0.5Â ppmv, and in the upper layer (85-105Â km) it increased with altitude from 0.05 to
2Â ppmv, while [SO2]/[SO] ratio was around 1 to 5. Those behaviors detonated new
puzzles about sulfur-bearing sources in Venus mesosphere, and some arguments
were contra our SPICAV/SOIR results (Sandor et al., 2012; Krasnopolsky et al.,
2012).
Now we’ve got new database (especially, cross-sections of gaseous absorption) to
improve SPICAV/SOIR retrievals for SO and SO2. Results from those retrievals are presented
here. |
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