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How accurate did GCMs compute the insolation at TOA for AMIP-2?

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Giorgetta,  Marco A.       
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Kinne,  Stefan
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Observations and Process Studies, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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GRL_32-L23707.pdf
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Citation

Raschke, E., Giorgetta, M. A., Kinne, S., & Wild, M. (2005). How accurate did GCMs compute the insolation at TOA for AMIP-2? Geophysical Research Letters, 32(23): L23707. doi:10.1029/2005GL024411.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-FE2E-0
Abstract
Monthly averages of solar radiation reaching the Top of the Atmosphere (TOA) as simulated by 20 General Circulation Models (GCMs) during the period 1985–1988 are compared. They were part of submissions to AMIP-2 (Atmospheric Model Intercomparison Project). Monthly averages of ISCCP-FD (International Satellite Cloud Climatology Project – Flux Data) are considered as reference. Considerable discrepancies are found: Most models reproduce the prescribed Total Solar Irradiance (TSI) value within ±0.7 Wm−2. Monthly zonal averages disagree between ±2 to ±7 Wm−2, depending on latitude and season. The largest model diversity occurs near polar regions. Some models display a zonally symmetric insolation, while others and ISCCP show longitudinal deviations of the order of ±1 Wm−2. With such differences in meridional gradients impacts in multi-annual simulations cannot be excluded. Sensitivity studies are recommended.