Articles | Volume 25, issue 19
https://doi.org/10.5194/acp-25-11689-2025
https://doi.org/10.5194/acp-25-11689-2025
Research article
 | 
30 Sep 2025
Research article |  | 30 Sep 2025

Variation in shortwave water vapour continuum and impact on clear-sky shortwave radiative feedback

Kaah P. Menang, Stefan A. Buehler, Lukas Kluft, Robin J. Hogan, and Florian E. Roemer

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Cited articles

Becker, T., and Wing, A. A.: Understanding the extreme spread in climate sensitivity within the Radiative-Convective Equilibrium Model Intercomparison Project, J. Adv. Model. Earth Syst., 12, e2020MS002165, https://doi.org/10.1029/2020MS002165, 2020. 
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Buehler, S. A., Mendrok, J., Eriksson, P., Perrin, A., Larsson, R., and Lemke, O.: ARTS, the Atmospheric Radiative Transfer Simulator – version 2.2, the planetary toolbox edition, Geosci. Model Dev., 11, 1537–1556, https://doi.org/10.5194/gmd-11-1537-2018, 2018. 
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We investigated the impact of the shortwave water vapour continuum absorption on clear-sky shortwave radiative feedback. For current temperatures, the impact is modest (<2%). In a warmer world, continuum-induced uncertainty in estimated feedback would be up to ~5%. Representing continuum absorption with the widely used semi-empirical model in radiative transfer calculations leads to an underestimation of this feedback. Constraining the shortwave continuum will help reduce these discrepancies.
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