Efficient modeling of sun/shade canopy radiation dynamics explicitly accounting for scattering

9981 9 35281 2 78554 document 35281 gmd-5-535-2012.pdf application/pdf 48b6853f7046a422c8f34dc522bafd8e MD5 890037 2016-02-29 10:22:32 https://pure.iiasa.ac.at/id/eprint/9981/1/gmd-5-535-2012.pdf 9981 1 1 application/pdf text en public cc_by

gmd-5-535-2012.pdf

published 35282 2 78557 document 35282 lightbox.jpg image/png 2f059a38260067040f7797662191bb81 MD5 55480 2016-02-29 10:22:42 https://pure.iiasa.ac.at/id/eprint/9981/2/lightbox.jpg 9981 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

lightbox.jpg

preview.jpg

medium.jpg

small.jpg

indexcodes.txt

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/35281 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/35281 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/35281 archive 351 disk0/00/00/99/81 2016-01-15 08:46:48 2021-08-27 17:22:31 2016-01-15 08:46:48 article show Bodin P. AL0503 Franklin O. 1791 0000-0002-0376-4140 Efficient modeling of sun/shade canopy radiation dynamics explicitly accounting for scattering pub iis_env iis_mod prog_esm 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. 2012-04 published European Geosciences Union (EGU) ; Copernicus 10.5194/gmd-5-535-2012 XJ-12-062 Geoscientific Model Development; 5(2):535-541 (26 April 2012) [doi:10.5194/gmd-5-535-2012] 1739 95 public Geoscientific Model Development 5 2 535-541 TRUE 1991-9603 FALSE info:eu-repo/semantics/article