Publication Abstracts

Mitevski et al. 2024, submitted

Mitevski, I., L.M. Polvani, H. He, G.A. Vecchi, C. Orbe, B.J. Soden, and R.L. Miller, 2024: State dependence of CO2 Effective Radiative Forcing from 1/16× to 16×CO2. J. Climate, submitted.

Most research on the state dependence of climate sensitivity has focused on radiative feedbacks, with less attention given to radiative forcing. However, recent investigations have revealed that the CO2 radiative forcing is not solely dependent on the CO2 concentration but also on the base state, and notably on the stratospheric temperature profile. Hence, we here carry out atmosphere-only experiments with prescribed sea-surface temperatures using CESM1-LE, broadband radiative transfer calculations, and a one-dimensional radiative-convective equilibrium model to thoroughly investigate the dependence of Effective Radiative Forcing (ERF) on varying levels of CO2 forcing and base state stratospheric temperatures from 1/16× to 16×CO2. We demonstrate that ERF exhibits a strong dependence on CO2 concentration that departs considerably from the logarithm of the CO2 concentration: doubling CO2 from a base state with 1/16×CO2 concentration yields an ERF of 2.8 W/m2, while the same doubling from an 8×CO2 base state yields an ERF of 4.5 W/m2. By separating the ERF into instantaneous radiative forcing (IRF) and radiative adjustments, we show that the IRF is primarily responsible for the state dependence of ERF. Furthermore, we find that the radiative adjustments are not constant with each CO2 doubling and halving. A significant implication of our findings is that the state dependence of ERF needs to be taken into account when studying climate sensitivity under large CO2 perturbations within the feedback-forcing framework.

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BibTeX Citation

@unpublished{mi08620i,
  author={Mitevski, I. and Polvani, L. M. and He, H. and Vecchi, G. A. and Orbe, C. and Soden, B. J. and Miller, R. L.},
  title={State dependence of CO2 Effective Radiative Forcing from 1/16× to 16×CO2},
  year={2024},
  journal={Journal of Climate},
  note={Manuscript submitted for publication}
}

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RIS Citation

TY  - UNPB
ID  - mi08620i
AU  - Mitevski, I.
AU  - Polvani, L. M.
AU  - He, H.
AU  - Vecchi, G. A.
AU  - Orbe, C.
AU  - Soden, B. J.
AU  - Miller, R. L.
PY  - 2024
TI  - State dependence of CO2 Effective Radiative Forcing from 1/16× to 16×CO2
JA  - J. Climate
JO  - Journal of Climate
ER  -

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