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- Title
A triple tree-ring constraint for tree growth and physiology in a global land surface model.
- Authors
Barichivich, Jonathan; Peylin, Philippe; Launois, Thomas; Daux, Valerie; Risi, Camille; Jeong, Jina; Luyssaert, Sebastiaan
- Abstract
Annually-resolved tree-ring records extending back to pre-industrial conditions have the potential to constrain the responses of global land surface models at interannual to centennial time scales. Here, we demonstrate a framework to constrain the representation of tree growth and physiology in the ORCHIDEE global land surface model using the simulated variability of tree-ring width and carbon (Δ13C) and oxygen (δ18O) stable isotopes in six sites in boreal and temperate Europe. We exploit the tree-ring triplet to derive integrative constraints for leaf physiology and growth from well-known mechanistic relationships among the variables. The model simulates Δ13C (r = 0.31-0.80) and δ18O (r = 0.36-0.74) better than tree-ring width (r < 0.55), with an overall skill similar to that of other models. The results show that growth variability is not well represented, and that the parameterization of leaf-level physiological responses to drought stress in the temperate region can be improved with tree-ring data. The representation of carbon storage and remobilization dynamics is critical to improve the realism of simulated growth variability, temporal carrying over and recovery of forest ecosystems after climate extremes. The simulated physiological response to rising CO2 over the 20th century is consistent with tree-ring data in the temperate region, despite an overestimation of seasonal drought stress and stomatal control on photosynthesis. Photosynthesis correlates directly with isotopic variability, but the origin of correlations with δ18O is not entirely physiological. The integration of tree-ring data and land surface models as demonstrated here should contribute towards reducing current uncertainties in forest carbon and water cycling.
- Subjects
EUROPE; TREE growth; TREE-rings; LEAF physiology; PHYSIOLOGY; LEAF growth; STABLE isotopes
- Publication
Biogeosciences Discussions, 2020, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2020-446