Can current climate model forcings explain the spatial and temporal signatures of decadal OLR variations?

Details Can current climate model forcings explain the spatial and temporal signatures of decadal OLR variations? Can current climate model forcings explain the spatial and temporal signatures of decadal OLR variations?

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29g..45a&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 7, pp. 45-1, CiteID 1141, DOI 10.1029/2001GL014620

Physics

8

Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

Top of atmosphere broadband radiative fluxes derived from satellite measurements exhibit surprisingly large decadal variability in the tropics which appears to be related to changes in cloudiness. Climate models fail to reproduce these changes, even when all of the currently known climate forcing agents are prescribed. The interannual variability and spatial signal of the observed changes are analysed and compared to various configurations of the Hadley Centre climate model. Applying EOF analysis to the spatial patterns of the variability shows that these are dominated by El Niño in both the satellite data and the model. However, the second EOF reveals the pattern due to the observed decadal-scale variation in outgoing longwave radiation (OLR), but this is not captured by the climate model. This suggests that either the model lacks some internal physical process or some additional external forcing that is responsible for the observed changes in OLR.

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