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Cited by 306

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Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental drought

Open access
Powell, Thomas L., Galbraith, David R., Christoffersen, Bradley O., Harper, Anna, Imbuzeiro, Hewlley M. A., Rowland, Lucy, Almeida, Samuel, Brando, Paulo M., da Costa, Antonio Carlos Lola, Costa, Marcos Heil, Levine, Naomi M., Malhi, Yadvinder, Saleska, Scott R., Sotta, Eleneide, Williams, Mathew, Meir, Patrick, Moorcroft, Paul R.·2013·New Phytologist

Abstract

Summary: Considerable uncertainty surrounds the fate of Amazon rainforests in response to climate change. Here, carbon (C) flux predictions of five terrestrial biosphere models (Community Land Model version 3.5 (CLM3.5), Ecosystem Demography model version 2.1 (ED2), Integrated BIosphere Simulator version 2.6.4 (IBIS), Joint UK Land Environment Simulator version 2.1 (JULES) and Simple Biosphere model version 3 (SiB3)) and a hydrodynamic terrestrial ecosystem model (the Soil–Plant–Atmosphere (SPA) model) were evaluated against measurements from two large‐scale Amazon drought experiments. Model predictions agreed with the observed C fluxes in the control plots of both experiments, but poorly replicated the responses to the drought treatments. Most notably, with the exception of ED2, the models predicted negligible reductions in aboveground biomass in response to the drought treatments, which was in contrast to an observed c. 20% reduction at both sites. For ED2, the timing of the decline in aboveground biomass was accurate, but the magnitude was too high for one site and too low for the other. Three key findings indicate critical areas for future research and model development. First, the models predicted declines in autotrophic respiration under prolonged drought in contrast to measured increases at one of the sites. Secondly, models lacking a phenological response to drought introduced bias in the sensitivity of canopy productivity and respiration to drought. Thirdly, the phenomenological water‐stress functions used by the terrestrial biosphere models to represent the effects of soil moisture on stomatal conductance yielded unrealistic diurnal and seasonal responses to drought.

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Metadata

Authors
Powell, T. L., Galbraith, D. R., Christoffersen, B. O., Harper, A., Imbuzeiro, H. M. A., Rowland, L., Almeida, S., Brando, P. M., da Costa, A. C. L., Costa, M. H., Levine, N. M., Malhi, Y., Saleska, S. R., Sotta, E., Williams, M., Meir, P., & Moorcroft, P. R.
Venue
New Phytologist
Publisher
Wiley
Published
2013-07-12
Volume
200
Issue
2
Pages
350-365
ISSN
  • 0028-646X (ISSN-L)
  • 1469-8137
OpenAlex
W2123558695
Cited by
306
References
54
FWCI
18.89
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental drought. https://app.cochat.ai/papers/10.1111/nph.12390
The paper
Powell, T. L., Galbraith, D. R., Christoffersen, B. O., Harper, A., Imbuzeiro, H. M. A., Rowland, L., Almeida, S., Brando, P. M., da Costa, A. C. L., Costa, M. H., Levine, N. M., Malhi, Y., Saleska, S. R., Sotta, E., Williams, M., Meir, P., & Moorcroft, P. R. (2013). Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental drought. New Phytologist. https://doi.org/10.1111/nph.12390

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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