Preprints
https://doi.org/10.5194/gmd-2023-115
https://doi.org/10.5194/gmd-2023-115
Submitted as: development and technical paper
 | 
31 Jul 2023
Submitted as: development and technical paper |  | 31 Jul 2023
Status: this preprint is currently under review for the journal GMD.

New Routine NLTE15μmCool-E v1.0 for Calculating the non-LTE CO2 15 μm Cooling in GCMs of Earth’s atmosphere

Alexander Kutepov and Artem Feofilov

Abstract. We present a new routine for calculating the non- local thermodynamic equilibrium (non-LTE) 15 μm CO2 cooling/heating of mesosphere and lower thermosphere in General Circulation Models. It uses the optimized models of the non-LTE in CO2 for day and night conditions and delivered cooling/heating with an error not exceeding 1 K/Day even for strong temperature disturbances. The routine uses the Accelerated Lambda Iteration and Opacity Distribution Function techniques for the exact solution of the non-LTE problem and is about 1000 faster than the standard matrix/line-by-line solution. It has an interface for feed-backs from the model and is ready for implementation. It may use any quenching rate coefficient of the CO2(ν2)+O(3P) reaction, handles large variations of O(3P) and allows the user to vary the number of vibrational levels and bands to find a balance between the calculation speed and accuracy. The suggested routine can handle the broad variation of CO2 both below and above the current volume mixing ratio, up to 4000 ppmv. This allows using this routine for modeling the Earth’s ancient atmospheres and the climate changes caused by increasing CO2.

Alexander Kutepov and Artem Feofilov

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gmd-2023-115', Ladislav Rezac, 05 Sep 2023
    • AC2: 'Reply on CC1', Alexander Kutepov, 15 Jan 2024
  • RC1: 'Comment on gmd-2023-115', Anonymous Referee #1, 28 Sep 2023
    • AC1: 'Reply on RC1', Alexander Kutepov, 06 Jan 2024
    • AC3: 'Reply on RC1', Alexander Kutepov, 14 Feb 2024
  • RC2: 'Comment on gmd-2023-115', Anonymous Referee #2, 19 Jan 2024
Alexander Kutepov and Artem Feofilov
Alexander Kutepov and Artem Feofilov

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Short summary
Infrared CO2 cooling of the middle and upper atmosphere is increasing. We developed new routine for very fast and accurate calculations of this cooling in general circulation models. New algorithms accounts for non-local thermodynamic equilibrium and is about 1000 time faster than the standard matrix algorithms. It is based on advanced techniques for the non-equilibrium emission calculations in stellar atmospheres, which so far have not been used in the Earth’s and planetary atmospheres.