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| Titel |
A vertically discretised canopy description for ORCHIDEE (SVN r2290) and the modifications to the energy, water and carbon fluxes |
| VerfasserIn |
K. Naudts, J. Ryder, M. J. McGrath, J. Otto, Y. Chen, A. Valade, V. Bellassen, G. Berhongaray, G. Bönisch, M. Campioli, J. Ghattas, T. De Groote, V. Haverd, J. Kattge, N. MacBean, F. Maignan, P. Merilä, J. Peñuelas, P. Peylin, B. Pinty, H. Pretzsch, E. D. Schulze, D. Solyga, N. Vuichard, Y. Yan, S. Luyssaert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 7 ; Nr. 8, no. 7 (2015-07-13), S.2035-2065 |
| Datensatznummer |
250116452
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| Publikation (Nr.) |
 copernicus.org/gmd-8-2035-2015.pdf |
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| Zusammenfassung |
| 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. |
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