[en] This VIRTIS instrument on board Venus Express has collected spectrally resolved images of the Venus nightside limb that show the presence of the (0,0) band of the Deltag1-->Sigmag3 infrared atmospheric system of O[SUB]2[/SUB] at 1.27 mum. The emission is produced by three-body recombination of oxygen atoms created by photodissociation of CO[SUB]2[/SUB] on the dayside. It is consistently bright so that emission limb profiles can be extracted from the images. The vertical distribution of O[SUB]2[/SUB](Deltag1) may be derived following Abel inversion of the radiance limb profiles. Assuming photochemical equilibrium, it is combined with the CO[SUB]2[/SUB] vertical distribution to determine the atomic oxygen density. The uncertainties on the O density caused by the Abel inversion reach a few percent at the peak, increasing to about 50% near 120 km. We first analyze a case when the CO[SUB]2[/SUB] density was derived from a stellar occultation observed with the SPICAV spectrometer simultaneously with an image of the O[SUB]2[/SUB] limb airglow. In other cases, an average CO[SUB]2[/SUB] profile deduced from a series of ultraviolet stellar occultations is used to derive the O profile, leading to uncertainties on the O density less than 30%. It is found that the maximum O density is generally located between 94 and 115 km with a mean value of 104 km. It ranges from less than 1×10[SUP][/SUP] to about 5×10[SUP][/SUP] cm[SUP][/SUP] with a global mean of 2.2×10[SUP][/SUP] cm[SUP][/SUP]. These values are in reasonable agreement with the VIRA midnight oxygen profile. The vertical O distribution is generally in good agreement with the oxygen profile calculated with a one-dimensional chemical-diffusive model. No statistical latitudinal dependence of the altitude of the oxygen peak is observed, but the maximum O density tends to decrease with increasing northern latitudes. The latitudinal distribution at a given time exhibits large variations in the O density profile and its vertical structure. The vertical oxygen distribution frequently shows multiple peaks possibly caused by waves or variations in the structure of turbulent transport. It is concluded that the O[SUB]2[/SUB] infrared night airglow is a powerful tool to map the distribution of atomic oxygen in the mesosphere between 90 and 115 km and improve future Venus reference atmosphere models.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Saglam, Adem ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Piccioni, Giuseppe; IASF-INAF, Roma, Italy
Drossart, Pierre; LESIA, Observatoire de Paris, Meudon, France
Montmessin, Frank; Service d'aéronomie du CNRS, Verrières-le-Buisson, and Université de Versailles Saint-Quentin-en-Yvelines, France
Bertaux, Jean-Loup; Service d'aéronomie du CNRS, Verrières-le-Buisson, and Université de Versailles Saint-Quentin-en-Yvelines, France
Language :
English
Title :
Atomic oxygen distribution in the Venus mesosphere from observations of O[SUB]2[/SUB] infrared airglow by VIRTIS-Venus Express
Allen D., Crisp D., and Meadows V. Variable oxygen airglow on Venus as a probe of atmospheric dynamics. Nature 359 (1992) 516-519
Bates D.R. Excitation and quenching of the oxygen bands in the nightglow. Planet. Space Sci. 36 (1988) 875-881
Bertaux J.-L., Vandaele A.-C., Korablev O., Villard E., Fedorova A., Fussen D., Quémerais E., and Belyaev D. A warm layer in Venus' cryosphere and high-altitude measurements of HF, HCl, H2O and HDO. Nature 450 (2007) 646-649
Bougher S.W., and Borucki W.J. Venus O2 visible and IR nightglow: Implications for lower thermosphere dynamics and chemistry. J. Geophys. Res. 99 (1994) 3759-3776
Bougher S.W., Rafkin S., and Drossart P. Dynamics of the Venus upper atmosphere: Outstanding problems and new constraints expected from Venus Express. Planet. Space Sci. 54 (2006) 1371-1380
Campbell I.M., and Gray C.N. Rate constants for the O(3P) recombination and association with N(4S). Chem. Phys. Lett. 18 (1973) 607-609
Connes P., Noxon J.F., Traub W.A., and Carleton N.P. O2(1Δ) emission in the day and night airglow of Venus. Astrophys. J. 233 (1979) L29-L32
Cox C., Saglam A., Gérard J.-C., Bertaux J.-L., González-Galindo F., Leblanc F., and Reberac A. The distribution of the ultraviolet nitric oxide martian night airglow: Observations from Mars Express and comparisons with a one-dimensional model. J. Geophys. Res. 113 (2008) E08012
Crisp D., Meadows V.S., Bézard B., de Bergh C., Maillard J.-P., and Mills F.P. Ground-based near-infrared observations of the Venus nightside: 1.27-μm O2(a1Δg) airglow from the upper atmosphere. J. Geophys. Res. 101 (1996) 4577-4594
Drossart P., Bézard B., Encrenaz Th., Lellouch E., Roos M., Taylor F.W., Collard A.D., Calcutt S.B., Pollack J., Grinspoon D.H., Carlson R.W., Baines K.H., and Kamp L.W. Search for spatial variations of the H2O abundance in the lower atmosphere of Venus from NIMS-Galileo. Planet. Space Sci. 41 (1993) 495-504
Drossart P., and 43 colleagues. Scientific goals for the observation of Venus by VIRTIS on ESA/Venus Express mission. Planet. Space Sci. 55 (2007) 1653-1672
Drossart P., and 43 colleagues. Infrared spectral imaging observations of Venus by VIRTIS reveal a dynamical upper atmosphere. Nature 450 (2007) 641-645
Gérard J.-C., Stewart A.I.F., and Bougher S.W. The altitude distribution of the Venus ultraviolet airglow and implications on vertical transport. Geophys. Res. Lett. 8 (1981) 633-636
Gérard J.-C., Saglam A., Piccioni G., Drossart P., Cox C., Erard S., Hueso R., and Sanchez-Lavega A. Distribution of the O2 infrared nightglow observed with VIRTIS on board Venus Express. Geophys. Res. Lett. 35 (2008) L02207
Gérard J.-C., Cox C., Saglam A., Bertaux J.-L., Villard E., and Nehmé C. Limb observations of the ultraviolet nitric oxide nightglow with SPICAV on board Venus Express. J. Geophys. Res. 113 (2008) E00B03
Hedin A.E., Niemann H.B., Kasprzak W.T., and Seiff A. Global empirical model of the Venus thermosphere. J. Geophys. Res. 88 (1983) 73-83
Hueso R., Sanchez-Lavega A., Piccioni G., Drossart P., Gérard J.-C., Khatuntsev I., Zasova L., and Migliorini A. Morphology and dynamics of Venus oxygen airglow from Venus Express/VIRTIS observations. J. Geophys. Res. 113 (2008) 10.1029/2008JE003081 E00B02
Kasprzak W.T., Hedin A.E., Mayr H.G., and Niemann H.B. Wavelike perturbations in the neutral atmosphere of Venus. J. Geophys. Res. 93 (1988) 11237-11245
Kasprzak W.T., Niemann H.B., Hedin A.E., Keating M.G., Bougher S.W., and Hunten D.M. Neutral composition measurements by the Pioneer Venus neutral mass spectrometer during orbiter re-entry. Geophys. Res. Lett. 20 (1993) 2747-2750
Keating G.M., Bertaux J.L., Bougher S.W., Dickinson R.E., Cravens T.E., and Hedin A.E. Venus international reference atmosphere. Adv. Space Res. 5 (1985) 117-171
Krasnopolsky V.A. Oxygen emissions in the night airglow of the Earth, Venus, and Mars. Planet. Space Sci. 34 (1986) 511-518
Krasnopolsky V.A., and Parshev V.A. Photochemistry of the Venus atmosphere. In: Hunten D.M., Colin L., Donahue T.M., and Moroz V.I. (Eds) (1983), Venus. Univ. of Arizona Press, Tucson 431-458
Lellouch E., Clancy T., Crisp D., Kliore A., Titov D., and Bougher S.W. Monitoring of mesospheric structure and dynamics. In: Bougher S.W., Hunten D.M., and Philips R.J. (Eds). Venus. II. Geology, Geophysics, Atmosphere, and Solar Wind Environment (1997), Univ. of Arizona Press, Tucson 295
Leu M.T., and Yung Y.L. Determination of the O2(1D) and O2(1S) yields in the reaction O + ClO = Cl + O2: Implications for photochemistry in the atmosphere of Venus. Geophys. Res. Lett. 14 (1987) 949-952
Massie S.T., Hunten D.M., and Sowell D.T. Day and night models of the Venus thermosphere. J. Geophys. Res. 88 (1983) 3955-3969
Mayr X., Harris H.G., Kasprzak W.T., Dube M., and Varosi F. Gravity waves in the upper atmosphere of Venus. J. Geophys. Res. 93 (1988) 11,247-11,262
Miller H.C., McCord J.E., Choy J., and Hager G.D. Measurement of the radiative lifetime of O2(a1 Δg) using cavity ring down spectroscopy. J. Quant. Spectrosc. Radiat. Trans. 69 (2001) 305-325
Montmessin F., and 10 colleagues. Sub-visible CO2 ice clouds detected in the mesosphere of Mars. Icarus 183 (2006) 403-410
Montmessin F., Quémerais E., Bertaux J.L., Korablev O., Rannou P., and Lebonnois S. Stellar occultations at UV wavelengths by the SPICAM instrument: Retrieval and analysis of martian haze profiles. J. Geophys. Res. 111 (2006) E09S09
Nair H., Allen M., Anbar A.D., Yung Y.L., and Clancy R.T. A photochemical model of the martian atmosphere. Icarus 111 (1994) 124-150
Niemann H.B., Kasprzak W.T., Hedin A.E., Hunten D.M., and Spencer N.W. Mass spectrometric measurements of the neutral gas composition of the thermosphere and exosphere of Venus. J. Geophys. Res. 85 (1980) 7817-7827
Parkinson W.H., Rufus J., and Yoshino K. Absolute cross section measurements of CO2 in the wavelength region 163-200 nm and the temperature dependence. Chem. Phys. 219 (2003) 45-57
Piccioni, G., Zasova, L., Migliorini, A., Drossart, P., Shakun, V., García Muñoz, V., Mills, F.P., Cardesin, A., and the VIRTIS-Venus Express Team, 2008. Oxygen nightglow vertical distribution from the VIRTIS Near IR observations in the Venus upper atmosphere. J. Geophys. Res., submitted for publication
Quémerais E., Bertaux J.-L., Korablev O., Dimarellis E., Cot C., Sandel B.R., and Fussen D. Stellar occultations observed by SPICAM on Mars Express. J. Geophys. Res. 111 (2006) E09 S04
Sander, S.P., and 10 colleagues, 2003. Chemical kinetics and photochemical data for use in atmospheric studies, Evaluation number 14, JPL publication 02-25
Slanger T., Huestis D.L., Cosby P.C., Chanover N.J., and Bida T.A. The Venus nightglow ground-based observations and chemical mechanisms. Icarus 182 (2006) 1-9
Svedhem H., and 26 colleagues. Venus Express-The first European mission to Venus. Planet. Space Sci. 55 (2007) 1636-1652
Titov D.V., and 22 colleagues. Venus Express science planning. Planet. Space Sci. 54 (2006) 1279-1297
Von Zahn U., Fricke K.H., Hunten D.M., Krankowsky D., Mauersberger K., and Nier A.O. The upper atmosphere of Venus during morning conditions. J. Geophys. Res. 85 (1980) 7829-7840
Yoshino K., Esmond J.R., Sun Y., Parkinson W.H., Ito K., and Matsui T. Absorption cross section measurements of carbon dioxide in the wavelength region 118.7 nm-175.5 nm and the temperature dependence. J. Quant. Spectrosc. Radiat. Trans. 50 (1996) 53-60
Yung Y.L., and DeMore W.B. Photochemistry of the stratosphere of Venus: Implications for atmospheric evolution. Icarus 51 (1982) 199-247