Title: RAMI4PILPS: Assessing Shortwave Radiation Fluxes in Land Surface Schemes
Authors: WIDLOWSKI Jean-LucMCGUFFIE KendalPINTY Bernard
Citation: The GEWEX Newsletter vol. 18 no. 4 p. 7
Publisher: International GEWEX Project Office
Publication Year: 2008
JRC N°: JRC48947
URI: http://www.gewex.org/Nov2008.pdf
Type: Articles in periodicals and books
Abstract: The purpose of the RAMI4PILPS experiment suite is to evaluate and compare the different approaches by which land surface schemes (LSS) in climate and weather prediction models quantify the radiation transfer within and beneath vegetation canopies. Given the availability of remotely-sensed, multi-annual, global datasets of radiative surface fluxes, that allow to capture both the spatial and temporal evolution of the energy partitioning (albedo, absorption, transmission) of terrestrial surfaces, RAMI4PILPS can be envisaged as a quality control mechanism that assesses the appropriateness of radiative flux formulations in current LSS in the light of future assimilation efforts of remote sensing products into climate and weather prediction models. Benefits to PILPS land surface models and their users include: 1) to quantify the typical errors associated with different modes of estimating the radiative surface fluxes in LSS; 2) to identify the impact that structural and spectral sub-grid variability may have on these flux estimates; and 3) to verify the conservation of energy at the level of the surface, as well as inconsistencies arising from the derivation of flux quantities from different sources with different levels of assumptions/simplifications. RAMI4PILPS will assess the quality of the prescribed/simulated radiative fluxes in LSS by direct comparison with reference solutions obtained from credible models identified during the third phase of the RAMI benchmarking exercise.
JRC Directorate:Sustainable Resources

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