The spectral dimension of longwave feedback in the CMIP3 and CMIP5 experiments

Xianglei Huang, Xiuhong Chen, Brian J. Soden, Xu Liu

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Radiative feedback is normally discussed in terms of the change of broadband flux. Yet it has an intrinsic dimension of spectrum. A set of longwave (LW) spectral radiative kernels (SRKs) is constructed and validated in a similar way as the broadband radiative kernel. The LW broadband feedback derived using this SRK are consistent with those from the broadband radiative kernels. As an application, the SRK is applied to 12 general circulation models (GCMs) from the Coupled Model Intercomparison Project Phase 3 and 12 GCMs from the Coupled Model Intercomparison Project Phase 5 simulations to derive the spectrally resolved Planck, lapse rate, and LW water vapor feedback. The spectral details of the Planck feedback from different GCMs are essentially the same, but the lapse rate and LW water vapor feedback do reveal spectrally dependent difference among GCMs. Spatial distributions of the feedback at different spectral regions are also discussed. The spectral feedback analysis provides us another dimension to understand and evaluate the modeled radiative feedback.

Original languageEnglish (US)
Pages (from-to)7830-7837
Number of pages8
JournalGeophysical Research Letters
Volume41
Issue number22
DOIs
StatePublished - Nov 28 2014

Keywords

  • lapse rate feedback
  • radiative feedback
  • spectral feedback
  • water vapor feedback

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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