Articles | Volume 16, issue 24
https://doi.org/10.5194/gmd-16-7491-2023
https://doi.org/10.5194/gmd-16-7491-2023
Development and technical paper
 | 
22 Dec 2023
Development and technical paper |  | 22 Dec 2023

Spherical air mass factors in one and two dimensions with SASKTRAN 1.6.0

Lukas Fehr, Chris McLinden, Debora Griffin, Daniel Zawada, Doug Degenstein, and Adam Bourassa

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Cited articles

Bognar, K., Tegtmeier, S., Bourassa, A., Roth, C., Warnock, T., Zawada, D., and Degenstein, D.: Stratospheric ozone trends for 1984–2021 in the SAGE II–OSIRIS–SAGE III/ISS composite dataset, Atmos. Chem. Phys., 22, 9553–9569, https://doi.org/10.5194/acp-22-9553-2022, 2022. a
Bourassa, A., Degenstein, D., and Llewellyn, E.: SASKTRAN: A spherical geometry radiative transfer code for efficient estimation of limb scattered sunlight, J. Quant. Spectrosc. Ra., 109, 52–73, https://doi.org/10.1016/j.jqsrt.2007.07.007, 2008. a
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Dubé, K., Zawada, D., Bourassa, A., Degenstein, D., Randel, W., Flittner, D., Sheese, P., and Walker, K.: An improved OSIRIS NO2 profile retrieval in the upper troposphere–lower stratosphere and intercomparison with ACE-FTS and SAGE III/ISS, Atmos. Meas. Tech., 15, 6163–6180, https://doi.org/10.5194/amt-15-6163-2022, 2022. a
Dubin, M., Hull, A. R., and Champion, K. S. W.: U.S. Standard Atmosphere, 1976, Technical Memorandum NOAA-S/T-76-1562 or NASA-TM-X-74335, National Oceanic and Atmospheric Administration, National Aeronautics and Space Administration, and United States Air Force, 1976. a, b
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Short summary
This work highlights upgrades to SASKTRAN, a model that simulates sunlight interacting with the atmosphere to help measure trace gases. The upgrades were verified by detailed comparisons between different numerical methods. A case study was performed using SASKTRAN’s multidimensional capabilities, which found that ignoring horizontal variation in the atmosphere (a common practice in the field) can introduce non-negligible errors where there is snow or high pollution.
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