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

doi:10.1016/j.icarus.2011.07.026

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 journal › Article

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 language	English
Pages (from-to)	610-614
Number of pages	5
Journal	Icarus
Volume	217
Issue number	2
DOIs	https://doi.org/10.1016/j.icarus.2011.07.026
Publication status	Published - Feb 1 2012

Keywords

Infrared observations
Venus, Atmosphere

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/j.icarus.2011.07.026

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

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.",

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AU - Matsui, H.

AU - Iwagami, N.

AU - Hosouchi, M.

AU - Ohtsuki, S.

AU - Hashimoto, G. L.

PY - 2012/2/1

Y1 - 2012/2/1

N2 - 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.

AB - 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.

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