A multi - layer land surface energy budget model for implicit coupling with global atmospheric simulations

J. Ryder, J. Polcher, P. Peylin, C. Ottlé, Y Chen, E. van Gorsel, V. Haverd, M.J. McGrath, K. Naudts, J. Otto, A Valade, S Luyssaert

    Research output: Contribution to JournalArticleAcademicpeer-review


    See, stats, and : https : / / www . researchgate . net / publication / 276534648 A - layer for simulations Article DOI : 10 . 5194 / gmdd - 7 - 8649 - 2014 CITATIONS 9 READS 155 12 , including : Some : land Master Jan French 193 , 481 SEE Eva Australian 98 , 225 SEE Vanessa The 85 SEE Juliane Climate (GERICS) 22 SEE All . The . Abstract In Earth system modelling , a description of the energy budget of the vegetated surface layer is fundamental as it determines the meteorological conditions in the planetary boundary layer and as such contributes to the atmospheric conditions and its circu - lation . The energy budget in most Earth system models has long been based on a 5 " big - leaf approach " , with averaging schemes that represent in - canopy processes . Such models have difficulties in reproducing consistently the energy balance in field obser - vations . We here outline a newly developed numerical model for energy budget simula - tion , as a component of the land surface model ORCHIDEE - CAN (Organising Carbon and Hydrology In Dynamic Ecosystems – CANopy) . This new model implements tech - 10 niques from single - site canopy models in a practical way . It includes representation of in - canopy transport , a multilayer longwave radiation budget , height - specific calculation of aerodynamic and stomatal conductance , and interaction with the bare soil flux within the canopy space . Significantly , it avoids iterations over the height of tha canopy and so maintains implicit coupling to the atmospheric model LMDz . As a first test , the model 15 is evaluated against data from both an intensive measurement campaign and longer term eddy covariance measurements for the intensively studied Eucalyptus stand at Tumbarumba , Australia . The model performs well in replicating both diurnal and an - nual cycles of fluxes , as well as the gradients of sensible heat fluxes . However , the model overestimates sensible heat flux against an underestimate of the radiation bud - 20 get . Improved performance is expected through the implementation of a more detailed calculation of stand albedo and a more up - to - date stomatal conductance calculation .
    Original languageEnglish
    Pages (from-to)8649-8701
    Number of pages53
    JournalGeosci . Model Dev . Discuss
    Publication statusPublished - 2014


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