HR: 09:44h
AN: A11C-07    [Abstracts]
TI: Potential Impacts of CF3I as a Replacement for CF3Br in Aircraft Applications
AU: Patten, K O
EM: kpatten@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois, Urbana, IL 61801-3070 United States
AU: Wuebbles, D J
EM: wuebbles@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois, Urbana, IL 61801-3070 United States
AU: * Li, Y
EM: yueli2@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois, Urbana, IL 61801-3070 United States
AU: Youn, D
EM: ydo88@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois, Urbana, IL 61801-3070 United States
AB: CF3I has been considered to be a candidate replacement of CF3Br 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 2004 version of the UIUC 2D Chemical Transport Model (CTM). Using the former estimate of aircraft emission profile for tank inerting in military aircraft as used in Rupnik et al. (2002), the resulting equivalent ODPs for CF3I were in the range of 0.07 to 0.25, above the U.S. EPA critical value 0.05 for policy consideration. As a sensitivity study, we analyzed a case with emissions associated with fuel inerting occurring at lower altitudes. This case resulted in much lower ODPs. Furthermore, through interactions with the National Institute of Standards and Technology, we analyzed the potential effects on ozone resulting from using CF3I in fire fighting connected with engine nacelle and auxiliary power unit applications. The scenario evaluated suggests that a significant fraction of the CF3I emissions would likely occur at lower tropospheric altitudes. The resulting effects on ozone showed extremely low ODPs < 0.05, assuming aircraft flights occurring in several different latitude regions of the Northern Hemisphere. According to the model calculation, the altitudes where most of aircraft released CF3I occurs seemed to be a dominant factor in its ozone depletion effects. If the assumptions made in the CF3I emission profile are indeed representative of actual release characteristics, CF3I released from aircraft for emissions related to fire fighting should have very low impact on the ozone layer and could be a qualified substitute for CF3Br in engine nacelles.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0365 Troposphere: composition and chemistry
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005