Summary
Within the framework of the MAP-Globus campaign, a chemiluminescent NO detector was launched, together with a similar experiment from the Max Planck Institut fur Aeronomie, Lindau, West Germany on September 20, 1983 from Aire sur l’Adour, France,(44°N, 0°W). The balloon was piloted to perform an excursion from 32 km to 22 km during the flight and returned to float at 32 km one hour before sunset to enable a sunset study to be made. The first ascent profile showed a rapid increase in NO mixing ratio from 50 ppt at 7 km to 250 ppt at the tropopause indicating a downward transport of NO into the troposphere. The nitric oxide mixing ratio continued to increase to be about 1 ppb at 25 km, and increased even more rapidly above 25 km to reach a value of approximately 10 ppb at 32 km. The first ascent and descent profiles, obtained with a SZA of less than 57° coincided even in detail to within 5% between 22 and 32 km assuring instrumental precision. The unchanging NO mixing ratio during the day is indicative of a very low mixing ratio of N2O5 compared to N0x, at least at mid-latitudes. The NO concentration at 32 km gradually decreased from when the SZA was 70° to sunset at which time it rapidly decreased by more than an order of magnitude in 10 minutes.
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© 1985 ECSC, EEC, EAEC, Brussels and Luxembourg
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Matthews, W.A., Kondo, Y., Takagi, M., Iwata, A. (1985). Nitric Oxide Profile from 7 to 32 km. In: Zerefos, C.S., Ghazi, A. (eds) Atmospheric Ozone. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5313-0_36
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DOI: https://doi.org/10.1007/978-94-009-5313-0_36
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