Richardson, TB, Forster, PM orcid.org/0000-0002-6078-0171, Andrews, T et al. (13 more authors) (2018) Carbon dioxide physiological forcing dominates projected Eastern Amazonian drying. Geophysical Research Letters, 45 (6). pp. 2815-2825. ISSN 0094-8276
Abstract
Future projections of east Amazonian precipitation indicate drying, but they are uncertain and poorly understood. In this study we analyze 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 multimodel 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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | precipitation; Amazon; physiological forcing; fast response; CO2 forcing; stomatal response |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst for Climate & Atmos Science (ICAS) (Leeds) |
Funding Information: | Funder Grant number NERC NE/N006038/1 ECMRWF European Centre Medium No ref number |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Mar 2018 12:06 |
Last Modified: | 12 Sep 2018 00:38 |
Status: | Published |
Publisher: | AGU |
Identification Number: | 10.1002/2017GL076520 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:128187 |
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