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 › peer-review

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 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.",

keywords = "Infrared observations, Venus, Atmosphere",

author = "H. Matsui and N. Iwagami and M. Hosouchi and S. Ohtsuki and Hashimoto, {G. L.}",

note = "Funding Information: The authors would like to thank the staff at IRTF for their support during the observations. The Infrared Telescope Facility is operated by the University of Hawaii under Cooperative Agreement No. NCC 5-538 with the National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program. The authors are also grateful to the OpenCLASTR project for the use of the RSTAR (a system for the transfer of atmospheric radiation) package in this research. This research is partially supported by Grant-in-Aid for Scientific Research (C) No. 21540460 from the Ministry of Education, Culture, Sports, Science and Technology, Japan . The authors also thank the proofreading team from the GCOE program.",

year = "2012",

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doi = "10.1016/j.icarus.2011.07.026",

language = "English",

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pages = "610--614",

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AU - Matsui, H.

AU - Iwagami, N.

AU - Hosouchi, M.

AU - Ohtsuki, S.

AU - Hashimoto, G. L.

N1 - Funding Information: The authors would like to thank the staff at IRTF for their support during the observations. The Infrared Telescope Facility is operated by the University of Hawaii under Cooperative Agreement No. NCC 5-538 with the National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program. The authors are also grateful to the OpenCLASTR project for the use of the RSTAR (a system for the transfer of atmospheric radiation) package in this research. This research is partially supported by Grant-in-Aid for Scientific Research (C) No. 21540460 from the Ministry of Education, Culture, Sports, Science and Technology, Japan . The authors also thank the proofreading team from the GCOE program.

PY - 2012/2

Y1 - 2012/2

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

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