Publication Abstracts

Ma et al. 2010

Ma, Q., R.H. Tipping, and R.R. Gamache, 2010: Uncertainties associated with theoretically calculated N2-broadened half-widths of H2O lines. Molec. Phys., 108, 2225-2252, doi:10.1080/00268976.2010.505209.

With different choices of the cut-offs used in the theoretical calculations, we have carried out extensive numerical calculations of the N2-broadend Lorentzian half-widths of the H2O lines using the modified Robert-Bonamy formalism. Based on these results, we are able to thoroughly check the convergence. We find that with low-order cut-offs commonly used in the literature, one is able to obtain converged values only for lines with large half-widths. Conversely, for lines with small half-widths much higher cut-offs are necessary to guarantee the convergence. We also analyze uncertainties associated with calculated half-widths, and these are correlated as above. In general, the smaller the half-widths are, the poorer the convergence and the larger the uncertainty associated with them. For convenience, one can divide all H2O lines into three categories: large, intermediate, and small according to their half-width values. One can use this division to judge whether the calculated half-widths are converged or not, based on the cut-offs used, and also to estimate how large their uncertainties are. We conclude that with the current Robert-Bonamy formalism for lines in category 1, one can achieve the accuracy requirement set by HITRAN while for lines in category 3, it is impossible to meet this goal.

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BibTeX Citation

@article{ma05700m,
  author={Ma, Q. and Tipping, R. H. and Gamache, R. R.},
  title={Uncertainties associated with theoretically calculated N2-broadened half-widths of H2O lines},
  year={2010},
  journal={Molec. Phys.},
  volume={108},
  pages={2225--2252},
  doi={10.1080/00268976.2010.505209},
}

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RIS Citation

TY  - JOUR
ID  - ma05700m
AU  - Ma, Q.
AU  - Tipping, R. H.
AU  - Gamache, R. R.
PY  - 2010
TI  - Uncertainties associated with theoretically calculated N2-broadened half-widths of H2O lines
JA  - Molec. Phys.
VL  - 108
SP  - 2225
EP  - 2252
DO  - 10.1080/00268976.2010.505209
ER  -

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