Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models

Jean Luc Widlowski, M. Taberner, B. Pinty, V. Bruniquel-Pinel, M. Disney, R. Fernandes, J. P. Gastellu-Etchegorry, N. Gobron, A. Kuusk, T. Lavergne, S. Leblanc, P. E. Lewis, E. Martin, Matti Mõttus, P. R.J. North, W. Qin, M. Robustelli, N. Rochdi, R. Ruiloba, C. SolerR. Thompson, W. Verhoef, M. M. Verstraete, D. Xie

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Abstract

The Radiation Transfer Model Intercomparison (RAMI) initiative benchmarks canopy reflectance models under well-controlled experimental conditions. Launched for the first time in 1999, this triennial community exercise encourages the systematic evaluation of canopy reflectance models on a voluntary basis. The first phase of RAMI focused on documenting the spread among radiative transfer (RT) simulations over a small set of primarily 1-D canopies. The second phase expanded the scope to include structurally complex 3-D plant architectures with and without background topography. Here sometimes significant discrepancies were noted which effectively prevented the definition of a reliable "surrogate truth," over heterogeneous vegetation canopies, against which other RT models could then be compared. The present paper documents the outcome of the third phase of RAMI, highlighting both the significant progress that has been made in terms of model agreement since RAMI-2 and the capability of/need for RT models to accurately reproduce local estimates of radiative quantities under conditions that are reminiscent of in situ measurements. Our assessment of the self-consistency and the relative and absolute performance of 3-D Monte Carlo models in RAMI-3 supports their usage in the generation of a "surrogate truth" for all RAMI test cases. This development then leads (1) to the presentation of the "RAMI Online Model Checker" (ROMC), an open-access web-based interface to evaluate RT models automatically, and (2) to a reassessment of the role, scope, and opportunities of the RAMI project in the future.

Original languageEnglish
Article numberD09111
JournalJournal of Geophysical Research: Atmospheres
Volume112
Issue number9
DOIs
Publication statusPublished - 16 May 2007
MoE publication typeA1 Journal article-refereed

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canopy reflectance
canopies
physical exercise
reflectance
exercise
canopy
Radiation
radiation
Radiative transfer
radiative transfer
canopies (vegetation)
plant architecture
in situ measurement

Cite this

Widlowski, J. L., Taberner, M., Pinty, B., Bruniquel-Pinel, V., Disney, M., Fernandes, R., ... Xie, D. (2007). Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models. Journal of Geophysical Research: Atmospheres, 112(9), [D09111]. https://doi.org/10.1029/2006JD007821
Widlowski, Jean Luc ; Taberner, M. ; Pinty, B. ; Bruniquel-Pinel, V. ; Disney, M. ; Fernandes, R. ; Gastellu-Etchegorry, J. P. ; Gobron, N. ; Kuusk, A. ; Lavergne, T. ; Leblanc, S. ; Lewis, P. E. ; Martin, E. ; Mõttus, Matti ; North, P. R.J. ; Qin, W. ; Robustelli, M. ; Rochdi, N. ; Ruiloba, R. ; Soler, C. ; Thompson, R. ; Verhoef, W. ; Verstraete, M. M. ; Xie, D. / Third Radiation Transfer Model Intercomparison (RAMI) exercise : Documenting progress in canopy reflectance models. In: Journal of Geophysical Research: Atmospheres. 2007 ; Vol. 112, No. 9.
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Widlowski, JL, Taberner, M, Pinty, B, Bruniquel-Pinel, V, Disney, M, Fernandes, R, Gastellu-Etchegorry, JP, Gobron, N, Kuusk, A, Lavergne, T, Leblanc, S, Lewis, PE, Martin, E, Mõttus, M, North, PRJ, Qin, W, Robustelli, M, Rochdi, N, Ruiloba, R, Soler, C, Thompson, R, Verhoef, W, Verstraete, MM & Xie, D 2007, 'Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models', Journal of Geophysical Research: Atmospheres, vol. 112, no. 9, D09111. https://doi.org/10.1029/2006JD007821

Third Radiation Transfer Model Intercomparison (RAMI) exercise : Documenting progress in canopy reflectance models. / Widlowski, Jean Luc; Taberner, M.; Pinty, B.; Bruniquel-Pinel, V.; Disney, M.; Fernandes, R.; Gastellu-Etchegorry, J. P.; Gobron, N.; Kuusk, A.; Lavergne, T.; Leblanc, S.; Lewis, P. E.; Martin, E.; Mõttus, Matti; North, P. R.J.; Qin, W.; Robustelli, M.; Rochdi, N.; Ruiloba, R.; Soler, C.; Thompson, R.; Verhoef, W.; Verstraete, M. M.; Xie, D.

In: Journal of Geophysical Research: Atmospheres, Vol. 112, No. 9, D09111, 16.05.2007.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Widlowski, Jean Luc

AU - Taberner, M.

AU - Pinty, B.

AU - Bruniquel-Pinel, V.

AU - Disney, M.

AU - Fernandes, R.

AU - Gastellu-Etchegorry, J. P.

AU - Gobron, N.

AU - Kuusk, A.

AU - Lavergne, T.

AU - Leblanc, S.

AU - Lewis, P. E.

AU - Martin, E.

AU - Mõttus, Matti

AU - North, P. R.J.

AU - Qin, W.

AU - Robustelli, M.

AU - Rochdi, N.

AU - Ruiloba, R.

AU - Soler, C.

AU - Thompson, R.

AU - Verhoef, W.

AU - Verstraete, M. M.

AU - Xie, D.

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