HR: 1340h
AN: A43A-0873    [Abstracts]
TI: Temperature Dependence of the Isotopic Composition of Ozone
AU: * CHEN, Y
EM: ycc@gps.caltech.edu
AF: California Institute of Technology, Geophysical and Planetary Sciences Division, 1200 E. California Blvd., PASADENA, CA 91125, United States
AU: Liang, M
EM: mcl@gps.caltech.edu
AF: California Institute of Technology, Geophysical and Planetary Sciences Division, 1200 E. California Blvd., PASADENA, CA 91125, United States
AU: Liang, M
EM: mcl@gps.caltech.edu
AF: Academia Sinica, Research Center for Environmental Changes, 128 Sec. 2, Academia Rd., Nankang, TAIPEI, 115, Taiwan
AU: Yung, Y L
EM: yly@gps.caltech.edu
AF: California Institute of Technology, Geophysical and Planetary Sciences Division, 1200 E. California Blvd., PASADENA, CA 91125, United States
AB: The overall magnitude of the isotopic composition of stratosphere ozone is ~100 per mil, which is large compared with that commonly known in atmospheric chemistry and geochemistry. Using the one- and two- dimensional CalTech/JPL KINETICS models of the middle atmosphere, which include both formation and photolysis processes of ozone, we found that the calculated δ49-O3 and δ50-O3 are about 10~15 per mil larger than the measurements (Krankowsky et al. 2007). We propose that the ~10 per mil differences between the model and observations may be caused by the temperature variations. Our model shows that a reduction of ~20K in the reference temperature profile could adequately reproduce the observations. By incorporating NCEP daily temperature into our models, better agreement between model and measurements is achieved. We attribute the residuals to a possible diurnal variation in temperature. Sensitivity studies have been carried out to explore the temperature dependence of the isotopic composition of ozone in the stratosphere.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0500 COMPUTATIONAL GEOPHYSICS (3200, 3252, 7833)
DE: 0545 Modeling (4255)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting