Temperature Dependence of Air-Broadening and Shift Coefficients of O3 Lines in the nu1 Band
High-resolution Fourier transform absorption spectra of ozone broadened by dry air have been recorded at a number of temperatures from -63&deg;C to 29&deg;C. Using a multispectrum nonlinear least-squares procedure, we fit 29 of these spectra simultaneously to determine the air-broadening and shift coefficients and their temperature dependences for 450 lines in the 9-&mgr;m region; most of these belong to the nu1 band. Partial air-broadening results were obtained for 104 additional lines, and room-temperature self-broadening coefficients were also determined for most of the 554 lines measured. These results cover a wide range of rotational quantum numbers, particularly in the R branch, with J" </= 55 and Ka" </= 12. The variation of the retrieved broadening and shift parameters with the rotational quantum numbers has been examined; particularly interesting behavior of the broadening coefficients is noted as the value of Ka" approaches that of J". The broadening and shift coefficients compare well with previous room-temperature measurements in the nu1 and other bands. The temperature-dependence results are also consistent (within the stated uncertainties) with the few previous measurements of the temperature dependence of air- and N2-broadening coefficients in other O3 bands, but disagree with the mean value given in the HITRAN compilation. Copyright 1997Academic Press
Smith
MAH
Atmospheric Sciences Division, NASA Langley Research Center, Hampton, Virginia, 23681-0001
Devi
VM
Benner
DC
Rinsland
CP