Articles | Volume 11, issue 1
https://doi.org/10.5194/gmd-11-339-2018
https://doi.org/10.5194/gmd-11-339-2018
Model description paper
 | 
23 Jan 2018
Model description paper |  | 23 Jan 2018

Fast matrix treatment of 3-D radiative transfer in vegetation canopies: SPARTACUS-Vegetation 1.1

Robin J. Hogan, Tristan Quaife, and Renato Braghiere

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Cited articles

Best, M. J., Pryor, M., Clark, D. B., Rooney, G. G., Essery, R. L. H., Ménard, C. B., Edwards, J. M., Hendry, M. A., Porson, A., Gedney, N., Mercado, L. M., Sitch, S., Blyth, E., Boucher, O., Cox, P. M., Grimmond, C. S. B., and Harding, R. J.: The Joint UK Land Environment Simulator (JULES), model description – Part 1: Energy and water fluxes, Geosci. Model Dev., 4, 677–699, https://doi.org/10.5194/gmd-4-677-2011, 2011.
Hansen, M., DeFries, R. S., Townshend, J. R. G., Carroll, M., Dimiceli, C., and Sohlberg, R. A.: Global percent tree cover at a spatial resolution of 500 meters: first results of the MODIS vegetation continuous fields algorithm, Earth Interact., 7, 1–15, 2003.
Higham, N. J.: The scalingand squaring method for the Matrix Exponential revisited, SIAM J. Matrix Anal. A., 26, 1179–1193, 2005.
Hogan, R. J.: SPARTACUS Vegetation 1.1: Matlab implementation of a matrix method to compute 3D radiative transfer in vegetation canopies (Version 1.1), Zenodo, https://doi.org/10.5281/zenodo.1100535, 2017.
Hogan, R. J. and Bozzo, A.: ECRAD: A New Radiation Scheme for the IFS, ECMWF Technical Memorandum 787, 33 pp., 2016.
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Short summary
This paper describes a fast new method for calculating how much sunlight is absorbed and reflected by forests and other types of vegetation, rigorously taking account of the complex 3-D structure. Careful evaluation shows it to perform well even in difficult scenes with snow on the ground. The method is suitable for use within the computer models used to make weather and climate forecasts, where it has the potential to improve predictions of near-surface temperature and photosynthesis rates.