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OH Radicals via Atmospheric 14CO

Published online by Cambridge University Press:  18 July 2016

Andreas Volz ,
Alfred Tönnissen ,
D H Ehhalt  and
Ahmed Khedim
Andreas Volz
Affiliation:
Institut für Atmosphärische Chemie, Kernforschungsanlage Jülich, GmbH, D-5170 Jülich 1, West Germany
Alfred Tönnissen
Affiliation:
Institut für Atmosphärische Chemie, Kernforschungsanlage Jülich, GmbH, D-5170 Jülich 1, West Germany
D H Ehhalt
Affiliation:
Institut für Atmosphärische Chemie, Kernforschungsanlage Jülich, GmbH, D-5170 Jülich 1, West Germany
Ahmed Khedim
Affiliation:
Institut für Atmosphärische Chemie, Kernforschungsanlage Jülich, GmbH, D-5170 Jülich 1, West Germany
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Abstract

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Measurements of 14CO in the lower troposphere show a well-defined seasonal variation between 11 ± 1 molecules cm–3 in summer and 25 ± 2 molecules cm–3 in winterat 51°N. The concentration at 27°N in summer is found to be 4.2 ± 0.7 molecules cm–3. From these data and published 12CO measurements, the average concentration of OH radicals in the troposphere is calculated to be 6.5 ± 2.5 × 105 molecules cm–3 using a 2-D time-dependent model. The corresponding 12CO lifetime is two months; the 14CO lifetime is five months.

Type
Man-Made 14C Variations
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 372 - 378
Copyright
Copyright © The American Journal of Science 

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