Publication Abstracts

Richardson et al. 2018

Richardson, T.B., P.M. Forster, T. Andrews, O. Boucher, G. Faluvegi, D. Fläschner, M. Kasoar, A. Kirkevåg, J.-F. Lamarque, G. Myhre, D. Olivié, B.H. Samset, D. Shawki, D. Shindell, T. Takemura, and A. Voulgarakis, 2018: Carbon dioxide physiological forcing dominates projected Eastern Amazonian drying. Geophys. Res. Lett., 45, no. 6, 2815-2825, doi:10.1002/2017GL076520.

Future projections of east Amazonian precipitation indicate drying, but they are uncertain and poorly understood. In this study we analyse the Amazonian precipitation response to individual atmospheric forcings using a number of global climate models. Black carbon is found to drive reduced precipitation over the Amazon due to temperature-driven circulation changes, but the magnitude is uncertain. CO2 drives reductions in precipitation concentrated in the east, mainly due to a robustly negative, but highly variable in magnitude, fast response. We find that the physiological effect of CO2 on plant stomata is the dominant driver of the fast response due to reduced latent heating, and also contributes to the large model spread. Using a simple model we show that CO2 physiological effects dominate future multi-model mean precipitation projections over the Amazon. However, in individual models temperature-driven changes can be large, but due to little agreement, they largely cancel out in the model-mean.

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BibTeX Citation

@article{ri08900u,
  author={Richardson, T. B. and Forster, P. M. and Andrews, T. and Boucher, O. and Faluvegi, G. and Fläschner, D. and Kasoar, M. and Kirkevåg, A. and Lamarque, J.-F. and Myhre, G. and Olivié, D. and Samset, B. H. and Shawki, D. and Shindell, D. and Takemura, T. and Voulgarakis, A.},
  title={Carbon dioxide physiological forcing dominates projected Eastern Amazonian drying},
  year={2018},
  journal={Geophys. Res. Lett.},
  volume={45},
  number={6},
  pages={2815--2825},
  doi={10.1002/2017GL076520},
}

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RIS Citation

TY  - JOUR
ID  - ri08900u
AU  - Richardson, T. B.
AU  - Forster, P. M.
AU  - Andrews, T.
AU  - Boucher, O.
AU  - Faluvegi, G.
AU  - Fläschner, D.
AU  - Kasoar, M.
AU  - Kirkevåg, A.
AU  - Lamarque, J.-F.
AU  - Myhre, G.
AU  - Olivié, D.
AU  - Samset, B. H.
AU  - Shawki, D.
AU  - Shindell, D.
AU  - Takemura, T.
AU  - Voulgarakis, A.
PY  - 2018
TI  - Carbon dioxide physiological forcing dominates projected Eastern Amazonian drying
JA  - Geophys. Res. Lett.
VL  - 45
IS  - 6
SP  - 2815
EP  - 2825
DO  - 10.1002/2017GL076520
ER  -

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