Knowledge Bank

In the present work, we report improved line parameters generated for ozone absorption bands in the 4.8 and $10\mu m$ spectral regions. These parameters have been obtained by combining the results of recent analyses of room temperature laboratory absorption spectra of natural and $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$. enriched ozone samples recorded at either 0.005 or $0.010cm-1$ resolution with the Fourier transform spectrometer operated on Kitt Peak by the National Solar Observatory. All of the parameters for the 4.8 and $10\mu m$ bands have been updated as compared to those on the 1986 HITRAN compilation. In the $10\mu m$ region, the results reported by Flaud $etal.1.2$ and Camy-Peyret $etal.3$ have been used to compute positions, intensities, and lower state energies for the $\nu 1$ and $\nu 3$ bands of the $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3,16O15O18O$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O18O16O$ isotopic species. The corresponding parameters for the $\nu 2+\nu 3-\nu 2,\nu 1+\nu 2-\nu 2,2\nu 3-\nu 3,\nu 1+\nu 3-\nu 1$, and $2\nu 1-\nu 3$ hot bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ were calculated using energy levels derived from studies of the 4.8, 5.7, and $14.3\mu m$ spectral regions. The $2\nu 1-\nu 3$ band has been calculated for the first time; it is unexpectedly strong, with numerous lines observable between 1100 and $1250cm-1$. In the $4.8\mu m$ region, the positions, intensities, and lower state energies of the $2\nu 1,\nu 1+\nu 3$, and $2\nu 3$ bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ were taken from Ref. 4. Corresponding parameters for the $\nu 2+2\nu 3-\nu 2,\nu 1+\nu 2+\nu 3-\nu 2$, and $2\nu 1+\nu 2-\nu 2$ hot bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ were calculated using energy levels determined from analysis of the 3.6 and $14.3\mu m$ spectral regions. For all bands, air-broadening coefficients at 296 K were calculated from a polynomial in $J\ast$ derived by fitting air-broadening measurements of individual lines in the $\nu 1$ and $\nu 3$ bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O35$. Self-broadening coefficients at 296 K were calculated from a similar fit to the measurements reported by Smith et al.$\mathrm{<mrow\; data-mjx-texclass="ORD">5</mrow>}$ The new ozone line parameters yield considerable improvement in the accuracy of high resolution atmospheric transmission and emission calculations in 4.8 and $10\mu m$ regions. Simulations generated with the new line parameters are compared with the laboratory spectra and 0.003 cm-1 resolution solar occulation spectra of the stratosphere to illustrate the quality of the new line parameters.