A vertically discretised canopy description for ORCHIDEE (SVN r2290) and the modifications to the energy, water and carbon fluxes
Naudts, Kim (Laboratoire des Sciences du Climat et de l'Environment)
Ryder, J. (Laboratoire des Sciences du Climat et de l'Environment)
McGrath, M. J. (Laboratoire des Sciences du Climat et de l'Environment)
Otto, J. (Laboratoire des Sciences du Climat et de l'Environment)
Chen, Yi-Ying (Laboratoire des Sciences du Climat et de l'Environment)
Valade, A. (Laboratoire des Sciences du Climat et de l'Environment)
Bellasen, V. (Institut National de la Recherche Agronomique (França))
Berhongaray, G. (University of Antwerp)
Bönisch, G. (Max-Planck-Institut für Biogeochemie)
Campiol, M. (University of Antwerp)
Ghattas, J. (Laboratoire des Sciences du Climat et de l'Environment)
De Groote, T. (University of Antwerp)
Haverd, Vanessa (Commonwealth Scientific and Industrial Research Organization (Australia). Ocean and Atmosphere Flagship)
Kattge, Jens (Max-Planck-Institut für Biogeochemie)
MacBean, N. (Laboratoire des Sciences du Climat et de l'Environment)
Maignan, Fabienne (Laboratoire des Sciences du Climat et de l'Environment)
Merilä, P. (Metsäntutkimuslaitos)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Peylin, Philippe (Laboratoire des Sciences du Climat et de l'Environment)
Pinty, B. (Commission of the European Communities. Joint Research Centre. Ispra Establishment)
Pretzsch, H. (Technische Universität München)
Schulze, E. D. (Max-Planck-Institut für Biogeochemie)
Solyga, D. (Laboratoire des Sciences du Climat et de l'Environment)
Vuichard, Nicolas (Laboratoire des Sciences du Climat et de l'Environment)
Yan, Y. (University of Antwerp)
Luyssaert, Sebastiaan (Laboratoire des Sciences du Climat et de l'Environment)

Date:	2015
Abstract:	Since 70 % of global forests are managed and forests impact the global carbon cycle and the energy exchange with the overlying atmosphere, forest management has the potential to mitigate climate change. Yet, none of the land-surface models used in Earth system models, and therefore none of today's predictions of future climate, accounts for the interactions between climate and forest management. We addressed this gap in modelling capability by developing and parametrising a version of the ORCHIDEE land-surface model to simulate the biogeochemical and biophysical effects of forest management. The most significant changes between the new branch called ORCHIDEE-CAN (SVN r2290) and the trunk version of ORCHIDEE (SVN r2243) are the allometric-based allocation of carbon to leaf, root, wood, fruit and reserve pools; the transmittance, absorbance and reflectance of radiation within the canopy; and the vertical discretisation of the energy budget calculations. In addition, conceptual changes were introduced towards a better process representation for the interaction of radiation with snow, the hydraulic architecture of plants, the representation of forest management and a numerical solution for the photosynthesis formalism of Farquhar, von Caemmerer and Berry. For consistency reasons, these changes were extensively linked throughout the code. Parametrisation was revisited after introducing 12 new parameter sets that represent specific tree species or genera rather than a group of often distantly related or even unrelated species, as is the case in widely used plant functional types. Performance of the new model was compared against the trunk and validated against independent spatially explicit data for basal area, tree height, canopy structure, gross primary production (GPP), albedo and evapotranspiration over Europe. For all tested variables, ORCHIDEE-CAN outperformed the trunk regarding its ability to reproduce large-scale spatial patterns as well as their inter-annual variability over Europe. Depending on the data stream, ORCHIDEE-CAN had a 67 to 92 % chance to reproduce the spatial and temporal variability of the validation data.
Grants:	European Commission 242564 European Commission 284181
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Geoscientific Model Development, Vol. 8, Issue 7 (July 2015) , p. 2035-2065, ISSN 1991-9603

DOI: 10.5194/gmd-8-2035-2015

Published version 31 p, 2.1 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles