Effect of Uncertainty in Water Vapor Continuum Absorption on CO2  Forcing, Longwave Feedback, and Climate Sensitivity

Roemer, Florian E.; Buehler, Stefan A.; Kluft, Lukas; Pincus, Robert

doi:10.22541/essoar.168881869.96894704/v1

Cited by 1 publication

(3 citation statements)

References 51 publications

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“…Our analysis is based on the konrad model version 1.0.1 (available at https://doi.org/10.5281/zenodo.6046423, Kluft et al, 2022), with some modifications to the model to support the scaling of absorption species (available at https://doi.org/10.5281/zenodo.10961148, Roemer et al, 2024a). For the radiative transfer simulations, we use the ARTS model version 2.6.2 (available at https://doi.org/10.5281/zenodo.10868342, Buehler et al, 2024).…”

Section: Appendix A: Sensitivity To Idealizationsmentioning

confidence: 99%

“…The model output produced in this study can be found at https://doi.org/10.5281/zenodo.10963838 (Roemer et al, 2024c), the code needed to run the models and produce the figures of this study can be found at https://doi. org/10.5281/zenodo.10963797 (Roemer et al, 2024b).…”

Section: Appendix A: Sensitivity To Idealizationsmentioning

confidence: 99%

“…For the radiative transfer simulations, we use the ARTS model version 2.6.2 (available at https://doi.org/10.5281/zenodo.10868342, Buehler et al., 2024). The model output produced in this study can be found at https://doi.org/10.5281/zenodo.10963838 (Roemer et al., 2024c), the code needed to run the models and produce the figures of this study can be found at https://doi.org/10.5281/zenodo.10963797 (Roemer et al., 2024b).…”

Section: Data Availability Statementmentioning

confidence: 99%

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Effect of Uncertainty in Water Vapor Continuum Absorption on CO₂ Forcing, Longwave Feedback, and Climate Sensitivity

Roemer,

Buehler,

Kluft

et al. 2024

J Adv Model Earth Syst

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We investigate the effect of uncertainty in water vapor continuum absorption at terrestrial wavenumbers on CO2 forcing , longwave feedback λ, and climate sensitivity at surface temperatures Ts between 270 and 330 K. We calculate this uncertainty using a line‐by‐line radiative‐transfer model and a single‐column atmospheric model, assuming a moist‐adiabatic temperature lapse‐rate and 80% relative humidity in the troposphere, an isothermal stratosphere, and clear skies. Due to the lack of a comprehensive model of continuum uncertainty, we represent continuum uncertainty in two different idealized approaches: In the first, we assume that the total continuum absorption is constrained at reference conditions; in the second, we assume that the total continuum absorption is constrained for all atmospheres in our model. In both approaches, we decrease the self continuum by 10% and adjust the foreign continuum accordingly. We find that continuum uncertainty mainly affects through its effect on λ. In the first approach, continuum uncertainty mainly affects λ through a decrease in the total continuum absorption with Ts; in the second approach, continuum uncertainty affects λ through a vertical redistribution of continuum absorption. In both experiments, the effect of continuum uncertainty on is modest at Ts = 288 K (≈0.02 K) but substantial at Ts ≥ 300 K (up to 0.2 K), because at high Ts, the effects of decreasing the self continuum and increasing the foreign continuum have the same sign. These results highlight the importance of a correct partitioning between self and foreign continuum to accurately determine the temperature dependence of Earth's climate sensitivity.

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Section: Appendix A: Sensitivity To Idealizationsmentioning

confidence: 99%

Section: Appendix A: Sensitivity To Idealizationsmentioning

confidence: 99%