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Article Dans Une Revue Journal of Geophysical Research: Biogeosciences Année : 2022

Increasing Functional Diversity in a Global Land Surface Model Illustrates Uncertainties Related to Parameter Simplification

Ethan Butler
Kirk Wythers
Habacuc Flores-Moreno
Daniel Ricciuto
Abhirup Datta
  • Fonction : Auteur
Arindam Banerjee
  • Fonction : Auteur
Owen Atkin
Jens Kattge
  • Fonction : Auteur
Peter Thornton
Madhur Anand
Sabina Burrascano
  • Fonction : Auteur
Chaeho Byun
J. Cornelissen
  • Fonction : Auteur
Estelle Forey
Steven Jansen
Koen Kramer
  • Fonction : Auteur
Vanessa Minden
  • Fonction : Auteur
Peter Reich

Résumé

Simulations of the land surface carbon cycle typically compress functional diversity into a small set of plant functional types (PFT), with parameters defined by the average value of measurements of functional traits. In most earth system models, all wild plant life is represented by between five and 14 PFTs and a typical grid cell (approximate to 100 x 100 km) may contain a single PFT. Model logic applied to this coarse representation of ecological functional diversity provides a reasonable proxy for the carbon cycle, but does not capture the non-linear influence of functional traits on productivity. Here we show through simulations using the Energy Exascale Land Surface Model in 15 diverse terrestrial landscapes, that better accounting for functional diversity markedly alters predicted total carbon uptake. The shift in carbon uptake is as great as 30% and 10% in boreal and tropical regions, respectively, when compared to a single PFT parameterized with the trait means. The traits that best predict gross primary production vary based on vegetation phenology, which broadly determines where traits fall within the global distribution. Carbon uptake is more closely associated with specific leaf area for evergreen PFTs and the leaf carbon to nitrogen ratio in deciduous PFTs.

Dates et versions

hal-03727594 , version 1 (19-07-2022)

Identifiants

Citer

Ethan Butler, Kirk Wythers, Habacuc Flores-Moreno, Daniel Ricciuto, Abhirup Datta, et al.. Increasing Functional Diversity in a Global Land Surface Model Illustrates Uncertainties Related to Parameter Simplification. Journal of Geophysical Research: Biogeosciences, 2022, 127 (3), ⟨10.1029/2021JG006606⟩. ⟨hal-03727594⟩
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