Sensitivity of radiative forcing, ocean heat uptake, and climate feedback to changes in anthropogenic greenhouse gases and aerosols

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Author(s) Paynter, David, Frölicher, Thomas L.
Publication Type Journal Items, Publication Status: Published
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Title Sensitivity of radiative forcing, ocean heat uptake, and climate feedback to changes in anthropogenic greenhouse gases and aerosols
Author(s) Paynter, David
Frölicher, Thomas L.
Journal or Series Title Journal of Geophysical Research. D, Atmospheres
Volume Number 120
Issue Number 19
Start Page 9837
End Page 9854
ISSN 2169-897X
0148-0227
2169-8996
Publisher American Geophysical Union
Publication Place Washington, DC
Publication Date 2015-10
Abstract We use both prescribed sea surface temperature and fully coupled versions of the Geophysical Fluid Dynamics Laboratory coupled climate model (CM3) to analyze the sensitivity of radiative forcing, ocean heat uptake, and climate feedback to changes in anthropogenic greenhouse gases and aerosols considered separately over the 1870 to 2005 period. The global anthropogenic aerosol climate feedback parameter (-α) of -1.13±0.33Wm⁻²K⁻¹ is indistinguishable from the greenhouse gas -α of -1.28±0.23Wm⁻²K⁻¹. However, this greenhouse gas climate feedback parameter is about 50% larger than that obtained for CM3 from a widely used linear extrapolation method of regressing Earth's top of atmosphere imbalance against surface air temperature change in idealized CO₂ radiative forcing experiments. This implies that the global mean surface temperature change due to forcing over the 1870-2005 period is 50% smaller than that predicted using the climate feedback parameter obtained from idealized experiments. This difference results from time dependence in α, which makes the radiative forcing obtained by the fixed sea surface temperature method incompatible with that obtained by the linear extrapolation method fitted over the first 150years after CO₂ is quadrupled. On a regional scale, α varies greatly between the greenhouse gas and aerosol case. This suggests that the relationship between transient and equilibrium climate sensitivities obtained from idealized CO₂ simulations, using techniques such as regional feedback analysis and heat uptake efficacy, may not hold for other forcing scenarios.
DOI 10.1002/2015JD023364
Additional Notes Published online by Wiley
Published online 3 October 2015
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
Organisational Unit(s)
NEBIS System Number 004289357
Source Database ID SCOPUS-84945445981
WOS-000365432800001
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@article{Pyntr2015,
  author = "Paynter, David and Fr{\"{o}}licher, Thomas L.",
  title = "{S}ensitivity of radiative forcing, ocean heat uptake, and climate feedback to changes in anthropogenic greenhouse gases and aerosols",
  journal = "Journal of Geophysical Research. D, Atmospheres",
  year = 2015,
  volume = "120",
  number = "19",
  pages = "9837--9854",
  month = oct,
}


E-Citations record created: Mon, 09 Nov 2015, 12:18:18 CET