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Simulation and validation of Arctic radiation and clouds in a regional climate model

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Rinke, A. , Dethloff, K. , Christensen, J. H. , Botzet, M. and Machenhauer, B. (1997): Simulation and validation of Arctic radiation and clouds in a regional climate model , Journal of Geophysical Research, 102 , pp. 29833-29847 .
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Abstract:

A regional atmospheric climate model has been applied to simulate the Arctic climate north of 65N at a 50 kmhorizontal resolution for January and July 1990. The monthly mean components of the surface radiative balanceand clouds using ECHAM3 parameterization have been described and compared with data. The modeloverestimates the global radiation, overestimates clouds during January and underestimates clouds during July.The high resolution simulations show many regional details due to regional different surface temperatures, clouds, surface albedo and snow depths. The bias in the model simulation can be reduced by using the improvedECHAM4 parameterization. The use of the ECHAM4 radiation parameterization clearly improves the results,owing the better description of atmospheric absorption. Sensitivity expe-riments with different cloud parametershave been described.

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