| COMMENTS: | JPl-2015(2015) recommendation:
The earlier recommendations for the absorption cross sections at 182-290 nm (JPL-2002, JPL-2006, JPL-2010) have been adopted
182-188 nm, mean of the data of
D. Gillotay, P.C. Simon, "Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures". Annales Geophysicae 6, 211-215 (1988), and
D.E. Robbins, "Photodissociation of methyl chloride and methyl bromide in the atmosphere," Geophys. Res. Lett. 3, 213-216, 757 (Erratum); DOI: 10.1029/GL003i004p00213; DOI: 10.1029/GL003i012p00757 (1976),
190-198 nm, mean of the data of
D. Gillotay, P.C. Simon, "Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures". Annales Geophysicae 6, 211-215 (1988),
A.P. Uthman, P.J. Demlein, T.D. Allston, M.C. Withiam, M.J. McClements, and G.A. Takacs, "Photoabsorption spectra of gaseous methyl bromide, ethylene dibromide, nitrosyl bromide, thionyl chloride, and sulfuryl chloride," J. Phys. Chem. 82, 2252-2257 (1978); DOI: 10.1021/j100509a021, and
D.E. Robbins, "Photodissociation of methyl chloride and methyl bromide in the atmosphere," Geophys. Res. Lett. 3, 213-216, 757 (Erratum) (1976); DOI: 10.1029/GL003i004p00213; DOI: 10.1029/GL003i012p00757,
200-260 nm, mean of the data of
D. Gillotay, P.C. Simon, "Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures". Annales Geophysicae 6, 211-215 (1988),
L.T. Molina, M.J. Molina, and F.S. Rowland, "Ultraviolet absorption cross sections of several brominated methanes and ethanes of atmospheric interest," J. Phys. Chem. 86, 2672-2676 (1982); DOI: 10.1021/j100211a023,
A.P. Uthman, P.J. Demlein, T.D. Allston, M.C. Withiam, M.J. McClements, and G.A. Takacs, "Photoabsorption spectra of gaseous methyl bromide, ethylene dibromide, nitrosyl bromide, thionyl chloride, and sulfuryl chloride," J. Phys. Chem. 82, 2252-2257 (1978); DOI: 10.1021/j100509a021, and
D.E. Robbins, "Photodissociation of methyl chloride and methyl bromide in the atmosphere," Geophys. Res. Lett. 3, 213-216, 757 (Erratum) (1976); DOI: 10.1029/GL003i004p00213; DOI: 10.1029/GL003i012p00757,
262-268 nm, mean of the data of
D. Gillotay, P.C. Simon, "Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures". Annales Geophysicae 6, 211-215 (1988),
L.T. Molina, M.J. Molina, and F.S. Rowland, "Ultraviolet absorption cross sections of several brominated methanes and ethanes of atmospheric interest," J. Phys. Chem. 86, 2672-2676 (1982); DOI: 10.1021/j100211a023, and
D.E. Robbins, "Photodissociation of methyl chloride and methyl bromide in the atmosphere," Geophys. Res. Lett. 3, 213-216, 757 (Erratum) (1976); DOI: 10.1029/GL003i004p00213; DOI: 10.1029/GL003i012p00757,
270-280 nm, mean of the data of
D. Gillotay, P.C. Simon, "Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures". Annales Geophysicae 6, 211-215 (1988), and
L.T. Molina, M.J. Molina, and F.S. Rowland, "Ultraviolet absorption cross sections of several brominated methanes and ethanes of atmospheric interest," J. Phys. Chem. 86, 2672-2676 (1982); DOI: 10.1021/j100211a023,
285-290 nm,data of
L.T. Molina, M.J. Molina, and F.S. Rowland, "Ultraviolet absorption cross sections of several brominated methanes and ethanes of atmospheric interest," J. Phys. Chem. 86, 2672-2676 (1982); DOI: 10.1021/j100211a023
The parameterization of the temperature dependence (210-300 K, 210-290 nm) using an empirical polynomial expansion:
log10 σ(λ, T) = ∑An λn + (T–273) × ∑Bnλn, n = 1-4
with the following parameters A and Bn
A0 = 7.997 B0= 0.457415
A1 = –0.889724 B1 = –0.00882996
A2 = 0.00838084 B2 = 6.40235 × 10–5
A3 = –3.03191 × 10–5 B3 = –2.06827 × 10–7
A4 = 3.69427 × 10–8 B4= 2.51393 × 10–10
obtained by a re-fit of the data of Gillotay and Simon(1988) is recommended |
