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Fixes and improvements to radiation: clumping and SAI

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@rgknox rgknox released this 17 Apr 19:50
sci.1.11.0_api.3.1.0
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This PR adds Charlie Koven's updates to the canopy radiation scheme (Norman).
Specifically:

  1. Added canopy clumping term that affects the direct and diffuse extinction coefficients. 2) Redefined SAI in terms of the target leaf biomass, because the old bdead scaling meant that SAI for large trees got really large. 3) Added diagnostic variables for PAR, LAI and SAI, 4) Functions that calculate SAI and LAI were cleaned and moved to a more appropriate place.
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