Publication Abstracts

Hodnebrog et al. 2020

Hodnebrog, Ø., G. Myhre, R.J. Kramer, K.P. Shine, T. Andrews, G. Faluvegi, M. Kasoar, A. Kirkevåg, J.-F. Lamarque, J. Mülmenstädt, D. Olivié, B.H. Samset, D. Shindell, C.J. Smith, T. Takemura, and A. Voulgarakis, 2020: The effect of rapid adjustments to halocarbons and N2O on radiative forcing. npj Clim. Atmos. Sci., 3, no. 1, 43, doi:10.1038/s41612-020-00150-x.

Rapid adjustments occur after initial perturbation of an external climate driver (e.g., CO2) and involve changes in, e.g. atmospheric temperature, water vapour and clouds, independent of sea surface temperature changes. Knowledge of such adjustments is necessary to estimate effective radiative forcing (ERF), a useful indicator of surface temperature change, and to understand global precipitation changes due to different drivers. Yet, rapid adjustments have not previously been analysed in any detail for certain compounds, including halocarbons and N2O. Here we use several global climate models combined with radiative kernel calculations to show that individual rapid adjustment terms due to CFC-11, CFC-12 and N2O are substantial, but that the resulting flux changes approximately cancel at the top-of-atmosphere due to compensating effects. Our results further indicate that radiative forcing (which includes stratospheric temperature adjustment) is a reasonable approximation for ERF. These CFCs lead to a larger increase in precipitation per kelvin surface temperature change (2.2±0.3%/K) compared to other well-mixed greenhouse gases (1.4±0.3%/K for CO2). This is largely due to rapid upper tropospheric warming and cloud adjustments, which lead to enhanced atmospheric radiative cooling (and hence a precipitation increase) and partly compensate increased atmospheric radiative heating (i.e. which is associated with a precipitation decrease) from the instantaneous perturbation.

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BibTeX Citation

@article{ho07700z,
  author={Hodnebrog, Ø. and Myhre, G. and Kramer, R. J. and Shine, K. P. and Andrews, T. and Faluvegi, G. and Kasoar, M. and Kirkevåg, A. and Lamarque, J.-F. and Mülmenstädt, J. and Olivié, D. and Samset, B. H. and Shindell, D. and Smith, C. J. and Takemura, T. and Voulgarakis, A.},
  title={The effect of rapid adjustments to halocarbons and N2O on radiative forcing},
  year={2020},
  journal={npj Clim. Atmos. Sci.},
  volume={3},
  number={1},
  pages={43},
  doi={10.1038/s41612-020-00150-x},
}

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RIS Citation

TY  - JOUR
ID  - ho07700z
AU  - Hodnebrog, Ø.
AU  - Myhre, G.
AU  - Kramer, R. J.
AU  - Shine, K. P.
AU  - Andrews, T.
AU  - Faluvegi, G.
AU  - Kasoar, M.
AU  - Kirkevåg, A.
AU  - Lamarque, J.-F.
AU  - Mülmenstädt, J.
AU  - Olivié, D.
AU  - Samset, B. H.
AU  - Shindell, D.
AU  - Smith, C. J.
AU  - Takemura, T.
AU  - Voulgarakis, A.
PY  - 2020
TI  - The effect of rapid adjustments to halocarbons and N2O on radiative forcing
JA  - npj Clim. Atmos. Sci.
VL  - 3
IS  - 1
SP  - 43
DO  - 10.1038/s41612-020-00150-x
ER  -

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