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Q. J. R. Meteorol. Soc. (2003), 129, pp. 29712988 doi: 10.1256/qj.02.216 Simulations of the effects of interannual and decadal variability on the clear-sky
 

Summary: Q. J. R. Meteorol. Soc. (2003), 129, pp. 29712988 doi: 10.1256/qj.02.216
Simulations of the effects of interannual and decadal variability on the clear-sky
outgoing long-wave radiation spectrum
By HELEN E. BRINDLEY1
and RICHARD P. ALLAN2
1Blackett Laboratory, Imperial College, London, UK
2
Met Of ce, Hadley Centre for Climate Prediction and Research, Bracknell, UK
(Received 19 November 2002; revised 23 May 2003)
SUMMARY
Using atmospheric pro les derived from the Hadley Centre atmosphere climate model version 3 (HadAM3)
as input to a radiative transfer code, the sensitivity of the resolved spectrum of clear-sky outgoing long-wave
radiation to both interannual and longer-term atmospheric variability has been analysed. A comparison of the
simulated spectra with available observations from two satellite-based instruments indicates a reasonable match,
although consistent differences are present. These may be explained by a combination of uncertainties in the
atmospheric state, and in the relative calibration of the two instruments. Focusing on the simulations: if HadAM3
is forced by the observed sea surface temperature (SST) record alone, and long-term alterations in the well-
mixed greenhouse gases are imposed in the radiance simulations, the changes seen within the major absorption
bands are robust. Under a second scenario, where the effects of solar variability, volcanic aerosol, ozone changes
and increases in the well-mixed greenhouse gases are also included in the forcing of HadAM3, the long-term

  

Source: Allan, Richard P. - Department of Meteorology, University of Reading

 

Collections: Geosciences