Variability of CO concentrations in the Venus troposphere from Venus Express/VIRTIS using a Band Ratio Technique |
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Authors: | CCC Tsang FW Taylor SJ Liddell G Piccioni SB Calcutt |
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Institution: | a Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Parks Road, Oxford, Oxon, OX1 3PU, UK b INAF-IASF, Via del Fosso del Cavaliere, 100 00133 Rome, Italy c LESIA, Observatoire de Paris, CNRS, UPMC Université Paris-Diderot, France |
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Abstract: | A fast method is presented for deriving the tropospheric CO concentrations in the Venus atmosphere from near-infrared spectra using the night side 2.3 μm window. This is validated using the spectral fitting techniques of Tsang et al. Tsang, C.C.C., Irwin, P.G.J., Taylor, F.W., Wilson, C.F., Drossart, P., Piccioni, G., de Kok, R., Lee, C., Calcutt, S.B., and the Venus Express/VIRTIS Team, 2008a. Tropospheric carbon monoxide concentrations and variability on Venus with Venus Express/VIRTIS-M observations. J. Geophys. Res. 113, doi: 10.1029/2008JE003089. E00B08] to show that monitoring CO in the deep atmosphere can be done quickly using large numbers of observations, with minimal effect from cloud and temperature variations. The new method is applied to produce some 1450 zonal mean CO profiles using data from the first eighteen months of operation from the Visible and Infrared Thermal Imaging Spectrometer infrared mapping subsystem (VIRTIS-M-IR) on Venus Express. These results show many significant long- and short-term variations from the mean equator-to-pole increasing trend previously found from earlier Earth- and space-based observations, including a possible North-South dichotomy, with interesting implications for the dynamics and chemistry of the lower atmosphere of Venus. |
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Keywords: | Venus atmosphere Abundances atmospheres Atmospheres dynamics Spectroscopy |
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