Abstract
The abundance of HDO above the clouds in the dayside atmosphere of Venus was measured by ground-based 2.3μm spectroscopy over 4 days. This is the first HDO observation above the clouds in this wavelength region corresponding to a new height region. The latitudinal distributions found show no clearly defined structure. The disk-averaged mixing ratio is 0.22±0.03ppm for a representative height region of 62-67km. This is consistent with measurements found in previous studies. Based on previous H 2O measurements, the HDO/H 2O ratio is found to be 140±20 times larger than the telluric ratio. This lies between the ratios of 120±40 and 240±25, respectively, reported for the 30-40km region by ground-based nightside spectroscopy and for the 80-100km region by solar occultation measurement on board the Venus Express.
Original language | English |
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Pages (from-to) | 610-614 |
Number of pages | 5 |
Journal | Icarus |
Volume | 217 |
Issue number | 2 |
DOIs | |
Publication status | Published - Feb 2012 |
Keywords
- Infrared observations
- Venus, Atmosphere
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science