Atmospheric odd oxygen production due to the photodissociation of ordinary and isotopic molecular oxygen |
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| Affiliation: | 1. Kjeller Vindteknikk, Norway;2. The Norwegian Meteorological Institute, Oslo, Norway;3. UK Met Office, Exeter, United Kingdom;1. Institute of Electronic Information and Automation of Civil Aviation University of China, Tianjin 300300, China;2. Ground Support Equipment Research Base of Civil Aviation University of China, Tianjin 300300, China;1. University of Pécs, Faculty of Sciences, Pécs, Hungary;2. Indian Institute of Tropical Meteorology, Pune, India;3. Eötvös Loránd University, Faculty of Science, Budapest, Hungary;1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;3. Physics Department, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;4. School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | Through a line by line calculation, the contributions of the Schumann-Runge bands of the ordinary and isotopic oxygen to the photodissociation of these molecules at different altitudes have been calculated. The photodissociation rates are expressed analytically. Contribution of the satellite lines has been taken into account. Due to the broadening of the SR lines, this contribution is insignificant. Similarly, it is shown that the first and higher vibrational states of the initial molecular states contribute insignificantly to the dissociation rates. It is also shown that the main contribution to the odd oxygen production in the important ozone producing altitudes is from the low vibrational and high rotational quantum numbers. The effect of the temperature on dissociation rates has similarly been studied.Due to its selective absorption, the isotopic oxygen 16O18O produces at 70 km 10 times as much odd oxygen as would be produced if the isotope did not have selective absorption. At this altitude 6% of the odd oxygen produced is due to this isotope. Also, 1.45% of the odd oxygen produced per second in an atmospheric column is due to 16O18O. However, the excess odd oxygen produced is not enough to explain the excess amount of ozone observed in the atmosphere which cannot be accounted for in the photochemical models.The calculated dissociation rates for the isotope are in moderate agreement with similar rates obtained by Blake et al. (1984, J. geophys. Res.89, 7277), but are by an order of magnitude smaller than similar rates given by Cicerone and McCrumb (1980, Geophys. Res. Lett.7, 251). |
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