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| Titel |
Photolysis of ozone: mass-dependent or mass-independent? |
| VerfasserIn |
Zhao-Hui Huang, Mao-Chang Liang, Sourendra Kumar Bhattacharya, Ching-Chi Chu, Tai-Sone Yih |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097697
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| Publikation (Nr.) |
 EGU/EGU2014-13305.pdf |
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| Zusammenfassung |
| The isotopic composition of atmospheric ozone is known to follow mass-independent
fractionation curve. The enhancement of 18O/16O in stratospheric O3 can be as high as 70 to
120orelative to oxygen. The fractionation is mainly affected by two processes: formation
and photolysis. The former is known to possess mass-independent effect, with 17O/16O
and 18O/16O variations following the slope of unity. Photolysis, however, is not
known. The photolysis of gaseous molecules at feature-poor transitions is usually
assumed to follow the mass-dependent fractionation but this assumption is not
verified. Irradiation experiments for ozone at various wavelengths in the Hartley
and Chappuis bands are carried out. Detail box modeling to interpret the results is
performed. Preliminary results show that the degree of isotope fractionation deviates
significantly from model predictions. Detailed results and implications will be presented. |
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