HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express
International audience Vertical distributions of the molecular density and mixing ratios of H2O and HDO in the Venus mesosphere have been obtained using Solar Occultation at Infrared (SOIR), a high-resolution (with λ/δλ ∼ 20,000) echelle spectrometer on Venus Express. The atmosphere is sounded in so...
Published in: | Journal of Geophysical Research |
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Online Access: | https://hal.archives-ouvertes.fr/hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253/document https://hal.archives-ouvertes.fr/hal-00349253/file/Fedorova_et_al-2008-Journal_of_Geophysical_Research__Solid_Earth_%281978-2012%29.pdf https://doi.org/10.1029/2008JE003146 |
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ftccsdartic:oai:HAL:hal-00349253v1 2023-05-15T17:40:03+02:00 HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express Fedorova, A. Korablev, Oleg Vandaele, A.-C. Bertaux, Jean-Loup Belyaev, D. Mahieux, A. Neefs, E. Wilquet, W.V. Drummond, R. Montmessin, Franck Villard, Eric Space Research Institute of the Russian Academy of Sciences (IKI) Russian Academy of Sciences Moscow (RAS) Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB) Service d'aéronomie (SA) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) European Space Agency 2008 https://hal.archives-ouvertes.fr/hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253/document https://hal.archives-ouvertes.fr/hal-00349253/file/Fedorova_et_al-2008-Journal_of_Geophysical_Research__Solid_Earth_%281978-2012%29.pdf https://doi.org/10.1029/2008JE003146 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JE003146 hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253/document https://hal.archives-ouvertes.fr/hal-00349253/file/Fedorova_et_al-2008-Journal_of_Geophysical_Research__Solid_Earth_%281978-2012%29.pdf doi:10.1029/2008JE003146 info:eu-repo/semantics/OpenAccess ISSN: 2169-9097 EISSN: 2169-9100 Journal of Geophysical Research. Planets https://hal.archives-ouvertes.fr/hal-00349253 Journal of Geophysical Research. Planets, Wiley-Blackwell, 2008, 113 (E5), pp.E00B22. ⟨10.1029/2008JE003146⟩ Venus H2O mesosphere [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.1029/2008JE003146 2021-11-21T02:52:47Z International audience Vertical distributions of the molecular density and mixing ratios of H2O and HDO in the Venus mesosphere have been obtained using Solar Occultation at Infrared (SOIR), a high-resolution (with λ/δλ ∼ 20,000) echelle spectrometer on Venus Express. The atmosphere is sounded in solar occultation in the range of altitudes from 65 to 130 km. Simultaneous measurements of water vapor lines in the spectral range around 2.61 μm (3830 cm−1) at altitudes between 70 and 110 km and HDO lines around 3.58 μm (2715cm−1) at altitudes 70–95 km have been performed. During 1 1/2 years, from April 2006 to August 2007, 54 such measurements have been carried out at different locations of Venus from the north pole to middle south latitudes. Most of the observations at morning and evening terminator correspond to high northern latitudes. We report values of mixing ratio and isotopic ratio obtained for 22 of those measurements occurring in the northern polar area. The average value of the volume mixing ratio of H2O is 1.16 ± 0.24 ppm and that of HDO is 0.086 ± 0.020 ppm. A depletion in the mixing ratio for both H2O and HDO is observed at 85 km, which can be related to a depletion of CO2 density above (∼95 km) and a possible temperature inversion at these altitudes. The vertical variation of HDO and H2O mixing ratio is within a factor of 2–3 for the analyzed set of observations. The temporal variations have been investigated, and no noticeable variability of H2O is reported at high northern altitudes. The average ratio of HDO/H2O obtained in this work, 240 ± 25 times the terrestrial ratio, is higher (≈1.5 times) than the value of 157 ± 30 times terrestrial reported for the lower atmosphere. This could be explained by a lower photodissociation of HDO and/or a lower escape rate of D atoms versus H atoms. Article in Journal/Newspaper North Pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) North Pole Venus ENVELOPE(-57.842,-57.842,-61.925,-61.925) Journal of Geophysical Research 113 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Venus H2O mesosphere [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Venus H2O mesosphere [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Fedorova, A. Korablev, Oleg Vandaele, A.-C. Bertaux, Jean-Loup Belyaev, D. Mahieux, A. Neefs, E. Wilquet, W.V. Drummond, R. Montmessin, Franck Villard, Eric HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
topic_facet |
Venus H2O mesosphere [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Vertical distributions of the molecular density and mixing ratios of H2O and HDO in the Venus mesosphere have been obtained using Solar Occultation at Infrared (SOIR), a high-resolution (with λ/δλ ∼ 20,000) echelle spectrometer on Venus Express. The atmosphere is sounded in solar occultation in the range of altitudes from 65 to 130 km. Simultaneous measurements of water vapor lines in the spectral range around 2.61 μm (3830 cm−1) at altitudes between 70 and 110 km and HDO lines around 3.58 μm (2715cm−1) at altitudes 70–95 km have been performed. During 1 1/2 years, from April 2006 to August 2007, 54 such measurements have been carried out at different locations of Venus from the north pole to middle south latitudes. Most of the observations at morning and evening terminator correspond to high northern latitudes. We report values of mixing ratio and isotopic ratio obtained for 22 of those measurements occurring in the northern polar area. The average value of the volume mixing ratio of H2O is 1.16 ± 0.24 ppm and that of HDO is 0.086 ± 0.020 ppm. A depletion in the mixing ratio for both H2O and HDO is observed at 85 km, which can be related to a depletion of CO2 density above (∼95 km) and a possible temperature inversion at these altitudes. The vertical variation of HDO and H2O mixing ratio is within a factor of 2–3 for the analyzed set of observations. The temporal variations have been investigated, and no noticeable variability of H2O is reported at high northern altitudes. The average ratio of HDO/H2O obtained in this work, 240 ± 25 times the terrestrial ratio, is higher (≈1.5 times) than the value of 157 ± 30 times terrestrial reported for the lower atmosphere. This could be explained by a lower photodissociation of HDO and/or a lower escape rate of D atoms versus H atoms. |
author2 |
Space Research Institute of the Russian Academy of Sciences (IKI) Russian Academy of Sciences Moscow (RAS) Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB) Service d'aéronomie (SA) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) European Space Agency |
format |
Article in Journal/Newspaper |
author |
Fedorova, A. Korablev, Oleg Vandaele, A.-C. Bertaux, Jean-Loup Belyaev, D. Mahieux, A. Neefs, E. Wilquet, W.V. Drummond, R. Montmessin, Franck Villard, Eric |
author_facet |
Fedorova, A. Korablev, Oleg Vandaele, A.-C. Bertaux, Jean-Loup Belyaev, D. Mahieux, A. Neefs, E. Wilquet, W.V. Drummond, R. Montmessin, Franck Villard, Eric |
author_sort |
Fedorova, A. |
title |
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
title_short |
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
title_full |
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
title_fullStr |
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
title_full_unstemmed |
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by Solar Occultation at Infrared spectrometer on board Venus Express |
title_sort |
hdo and h2o vertical distributions and isotopic ratio in the venus mesosphere by solar occultation at infrared spectrometer on board venus express |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.archives-ouvertes.fr/hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253/document https://hal.archives-ouvertes.fr/hal-00349253/file/Fedorova_et_al-2008-Journal_of_Geophysical_Research__Solid_Earth_%281978-2012%29.pdf https://doi.org/10.1029/2008JE003146 |
long_lat |
ENVELOPE(-57.842,-57.842,-61.925,-61.925) |
geographic |
North Pole Venus |
geographic_facet |
North Pole Venus |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
ISSN: 2169-9097 EISSN: 2169-9100 Journal of Geophysical Research. Planets https://hal.archives-ouvertes.fr/hal-00349253 Journal of Geophysical Research. Planets, Wiley-Blackwell, 2008, 113 (E5), pp.E00B22. ⟨10.1029/2008JE003146⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JE003146 hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253 https://hal.archives-ouvertes.fr/hal-00349253/document https://hal.archives-ouvertes.fr/hal-00349253/file/Fedorova_et_al-2008-Journal_of_Geophysical_Research__Solid_Earth_%281978-2012%29.pdf doi:10.1029/2008JE003146 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2008JE003146 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
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1766140828917432320 |