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

H. Matsui, N. Iwagami, M. Hosouchi, S. Ohtsuki, G. L. Hashimoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 languageEnglish
Pages (from-to)610-614
Number of pages5
JournalIcarus
Volume217
Issue number2
DOIs
Publication statusPublished - Feb 1 2012

Keywords

  • Infrared observations
  • Venus, Atmosphere

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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