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| Titel |
Efficient modeling of sun/shade canopy radiation dynamics explicitly accounting for scattering |
| VerfasserIn |
P. Bodin, O. Franklin |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2012-04-26), S.535-541 |
| Datensatznummer |
250002456
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| Publikation (Nr.) |
 copernicus.org/gmd-5-535-2012.pdf |
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| Zusammenfassung |
The separation of global radiation (Rg) into its direct (Rb) and
diffuse constituents (Rg) is important when modeling plant
photosynthesis because a high Rd:Rg ratio has been shown to enhance
Gross Primary Production (GPP). To include this effect in vegetation models,
the plant canopy must be separated into sunlit and shaded leaves. However,
because such models are often too intractable and computationally expensive
for theoretical or large scale studies, simpler sun-shade approaches are
often preferred. A widely used and computationally efficient sun-shade model
was developed by Goudriaan (1977) (GOU). However, compared to more complex
models, this model's realism is limited by its lack of explicit treatment of
radiation scattering.
Here we present a new model based on the GOU model, but which in contrast
explicitly simulates radiation scattering by sunlit leaves and the
absorption of this radiation by the canopy layers above and below (2-stream
approach). Compared to the GOU model our model predicts significantly
different profiles of scattered radiation that are in better agreement with
measured profiles of downwelling diffuse radiation. With respect to these
data our model's performance is equal to a more complex and much slower
iterative radiation model while maintaining the simplicity and computational
efficiency of the GOU model. |
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