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Original Research Papers

Short-wave and long-wave surface radiation budgets in GCMs: a review based on the IPCC-AR4/CMIP3 models

Author:

Martin Wild

Institute for Atmospheric and Climate Science, ETH Zurich, Universitätsstr. 16, CH-8092 Zurich, CH
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Abstract

Here I review the developments in the representation of radiation budgets in global climate models (GCMs) from a surface perspective, considering early models up to the latest model generation used in the IPCC fourth assessment report (AR4). As in previous model generations, considerable differences in the simulated global mean radiation budgets are also present in the IPCC-AR4 models, particularly in the atmosphere and at the surface. I use a comprehensive set of surface observations to constrain these uncertainties, and focus on the downward short-and long-wave radiation, which can directly be validated against the surface observations. The majority of the IPCC-AR4 models still shows a tendency to overestimate the short-wave and underestimate the long-wave downward radiation at the surface, each by 6 Wm−2 on average, a long standing problem in many GCMs. A subset of models, however, is now capable of simulating at least one of the short-or long-wave downward components adequately. Model biases in all-and clear-sky fluxes are often similar, suggesting that deficiencies in clear-sky radiative transfer calculations are major contributors to the excessive surface insolation in many of the models. No indication is found that the simulated excessive surface insolation is due to missing cloud absorption.

How to Cite: Wild, M., 2008. Short-wave and long-wave surface radiation budgets in GCMs: a review based on the IPCC-AR4/CMIP3 models. Tellus A: Dynamic Meteorology and Oceanography, 60(5), pp.932–945. DOI: http://doi.org/10.1111/j.1600-0870.2008.00342.x
  Published on 01 Jan 2008
 Accepted on 30 Apr 2008            Submitted on 30 Nov 2007

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