Publication Abstracts

Mirzagholi et al. 2025, submitted

Mirzagholi, L., N. Kiang, W. Ni-Meister, A. Oliphant, C.Y.J. Lui, C. Montes, and C. Shaaf, 2025: A clumped-foliage canopy radiative transfer model for a Global Dynamic Terrestrial Ecosystem Model III: Diurnal and seasonal albedo for a western broadleaf deciduous forest. Glob. Change Biol., submitted.

We evaluate a cohort-based, geometrical-optical canopy radiative transfer model (Ent/ACTS) at a temperate deciduous broadleaf forest (Morgan Monroe State Forest, Indiana) to quantify how canopy structure, and leaf and soil optical properties jointly control albedo and foliage clumping throughout the growing season, from leaf-out to senescence. Using tree inventory data and leaf area index (LAI) measurements, we calibrate single- and two-cohort (overstory-understory) canopy representations to match basal area index, stand-level LAI, and vertical foliage profiles. We then compare simulated visible (VIS), near-infrared (NIR), and shortwave (SW) albedo against MODIS and FLUXNET observations, and analyze model sensitivities to leaf spectra, soil albedo, and crown ellipticity b/R.

Both configurations reproduce VIS, NIR, and SW albedo with annual mean absolute errors within ±0.006, ±0.040, and ±0.011, respectively, but only the two-cohort case captures the observed vertical stratification and reduces the NIR albedo mismatch. Sensitivity experiments show that leaf optical properties dominate VIS and strongly influence NIR albedo, while soil background and crown geometry exert smaller effects, and phenology controls the timing of transitions. These results demonstrate a practical, observation-constrained framework for representing canopy structural heterogeneity and clumping in demographic dynamic global vegetation models using a GORT-based scheme that is both physically grounded and computationally tractable for predicting canopy albedo.

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BibTeX Citation

@unpublished{mi01720l,
  author={Mirzagholi, L. and Kiang, N. and Ni-Meister, W. and Oliphant, A. and Lui, C. Y. J. and Montes, C. and Shaaf, C.},
  title={A clumped-foliage canopy radiative transfer model for a Global Dynamic Terrestrial Ecosystem Model III: Diurnal and seasonal albedo for a western broadleaf deciduous forest},
  year={2025},
  journal={Global Change Biology},
  note={Manuscript submitted for publication}
}

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RIS Citation

TY  - UNPB
ID  - mi01720l
AU  - Mirzagholi, L.
AU  - Kiang, N.
AU  - Ni-Meister, W.
AU  - Oliphant, A.
AU  - Lui, C. Y. J.
AU  - Montes, C.
AU  - Shaaf, C.
PY  - 2025
TI  - A clumped-foliage canopy radiative transfer model for a Global Dynamic Terrestrial Ecosystem Model III: Diurnal and seasonal albedo for a western broadleaf deciduous forest
JA  - Glob. Change Biol.
JO  - Global Change Biology
ER  -

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