Uncertainty in the response of transpiration to CO2 and implications for climate change.

Mengis, Nadine, Keller, David P. , Eby, M. and Oschlies, Andreas (2015) Uncertainty in the response of transpiration to CO2 and implications for climate change. Open Access Environmental Research Letters, 10 (9). 094001. DOI 10.1088/1748-9326/10/9/094001.

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Abstract

While terrestrial precipitation is a societally highly relevant climate variable, there is little consensus among climate models about its projected 21st century changes. An important source of precipitable water over land is plant transpiration. Plants control transpiration by opening and closing their stomata. The sensitivity of this process to increasing CO2 concentrations is uncertain. To assess the impact of this uncertainty on future climate, we perform experiments with an intermediate complexity Earth System Climate Model (UVic ESCM) for a range of model-imposed transpiration-sensitivities to CO2. Changing the sensitivity of transpiration to CO2 causes simulated terrestrial precipitation to change by −10% to +27% by 2100 under a high emission scenario. This study emphasises the importance of an improved assessment of the dynamics of environmental impact on vegetation to better predict future changes of the terrestrial hydrological and carbon cycles.

Document Type: Article
Additional Information: WOS:000367141000004
Keywords: transpiration sensitivity to CO2; atmosphere/land interaction; future precipitation changes; earth system modelling
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1088/1748-9326/10/9/094001
ISSN: 1748-9326
Date Deposited: 07 Sep 2015 08:07
Last Modified: 12 Apr 2017 08:51
URI: http://oceanrep.geomar.de/id/eprint/29514

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