The influence of the sky radiance distribution on the flux dens...
Citation:
Reference type: Journal Article
Abstract:
The simulaton of the shortwave diffuse sky radiation in plant radiation regime models has traditionally used the uniform overcast (UOC) sky radiance distribution. It a has been assumed that this distribution is a good first estimate to the actual sky radiance for average clear day. To test this assumption, as standard overcast (SOC), a uniform overcast, and a clear sky radiance distribution were simulated and the flux density due to sky radiation in the shadow of an ellipsoidal crown calculated. Results show that the choice of sky radiance distribution greatly influences the sky radiation reaching points in the shadow of the simulated tree. The results support the contention that the SOC and UOC sky radiance distributions are quite similar with respect to the radiant flux density in tree shadows. However, the clear-sky radiance distribution resulted in aproximately four times less radiant flux density in the tree shadow than that (1) the use of the UOC radiance distibution greatly overestimated the diffuse radiation in the shadow of a tree, and (2) a clear sky radiance distribution would enhance the prediciton of the radiation regime in crown arrays.
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