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Spatially-resolved high-resolution spectroscopy of Venus 2. Variations of HDO, OCS, and SO2 at the cloud tops by Vladimir A. Krasnopolsky is a Physics and Astronomy article available to read on EtoBox.

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While CO, HCl, and HF, that were considered in the first part of this work, have distinct absorption lines in high-resolution spectra and were detected four decades ago, the lines of HDO, OCS, and SO 2 are either very weak or blended by the telluric lines and have not been observed previously by ground-based infrared spectroscopy at the Venus cloud tops. The H 2 O abundance above the Venus clouds is typically below the detection limit of ground-based IR spectroscopy. However, the large D/H ratio on Venus facilitates observations of HDO. Converted to H 2 O with D/H % 200, our observations at 2722 cm À1 in the Venus afternoon show a H 2 O mixing ratio of $1.2 ppm at latitudes between ±40°increasing to ±60°by a factor of 2. The observations in the early morning reveal the H 2 O mixing ratio that is almost constant at 2.9 ppm within latitudes of ±75°. The measured H 2 O mixing ratios refer to 74 km. The observed increase in H 2 O is explained by the lack of photochemical production of sulfuric acid in the night time. The recent observations at the P-branch of OCS at 4094 cm À1 confirm our detection of OCS. Four distributions of OCS along the disk of Venus at various latitudes and local

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Author

Vladimir A. Krasnopolsky

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV; Oxford University Press (OUP) (ISSN 0019-1035)

Published

2010

Language

EN

Field

Physics and Astronomy (Physical Sciences)