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| Titel |
Potential impacts of CF3I on ozone as a replacement for CF3Br in aircraft applications |
| VerfasserIn |
Y. Li, K. O. Patten, D. Youn, D. J. Wuebbles |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 12 ; Nr. 6, no. 12 (2006-10-10), S.4559-4568 |
| Datensatznummer |
250004136
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| Publikation (Nr.) |
 copernicus.org/acp-6-4559-2006.pdf |
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| Zusammenfassung |
| Iodotrifluoromethane (CF3I) has been considered to be a candidate
replacement for bromotrifluoromethane (CF3Br), which is used in
aircraft for fuel inerting and for fire fighting. In this study, the
chemical effects of aircraft-released CF3I on atmospheric ozone were
examined with the University of Illinois at Urbana-Champaign two-dimensional
chemical-radiative-transport (UIUC 2-D CRT) model. Using an earlier estimate
of the aircraft emission profile for tank inerting in military aircraft, the
resulting equivalent Ozone Depletion Potentials (ODPs) for CF3I were in
the range of 0.07 to 0.25. As a sensitivity study, we also analyzed
CF3I emissions associated with fuel inerting if it were to occur at
lower altitudes using an alternative estimate. The model calculations of
resulting effects on ozone for this case gave ODPs≤0.05. Furthermore,
through interactions with the National Institute of Standards and Technology
(NIST), we analyzed the potential effects on ozone resulting from using
CF3I in fire fighting connected with engine nacelle and auxiliary power
unit applications. The scenarios evaluated using the NIST estimate suggested
that the ODPs obtained by assuming aircraft flights occurring in several
different latitude regions of the Northern Hemisphere are extremely low.
According to the model calculation, the altitude where CF3I is released
from aircraft is a dominant factor in its ozone depletion effects. On the
assumption that the CF3I emission profile is representative of actual
release characteristics, aircraft-released CF3I has much lower impacts
than CF3Br. |
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