Latitudinal distribution of HDO abundance above Venus' clouds by ground-based 2.3 μm spectroscopy

Details Latitudinal distribution of HDO abundance above Venus' clouds by ground-based 2.3 μm spectroscopy Latitudinal distribution of HDO abundance above Venus' clouds by ground-based 2.3 μm spectroscopy

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012icar..217..610m&link_type=abstract

Icarus, Volume 217, Issue 2, p. 610-614.

Physics

Scientific paper

The abundance of HDO above the clouds in the dayside atmosphere of Venus was measured by ground-based 2.3 μm 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 ± 0.03 ppm for a representative height region of 62-67 km. This is consistent with measurements found in previous studies. Based on previous H2O measurements, the HDO/H2O 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 30-40 km region by ground-based nightside spectroscopy and for the 80-100 km region by solar occultation measurement on board the Venus Express.

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