Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 19, Pages 10240-10248Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069896
Keywords
CO2 physiological effects; land-atmosphere interactions; heat wave; water cycle; climate change; regional climate model
Categories
Funding
- Alliance Program Doctoral Mobility Grant
- LABEX BASC [ANR-11-LABX-0034]
- IPSL group for regional climate and environmental studies
- IPSL HPC
- data center CLIMSERV
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Plant stomata couple the energy, water, and carbon cycles. We use the framework of Regional Climate Modeling to simulate the 2003 European heat wave and assess how higher levels of surface CO2 may affect such an extreme event through land-atmosphere interactions. Increased CO2 modifies the seasonality of the water cycle through stomatal regulation and increased leaf area. As a result, the water saved during the growing season through higher water use efficiency mitigates summer dryness and the heat wave impact. Land-atmosphere interactions and CO2 fertilization together synergistically contribute to increased summer transpiration. This, in turn, alters the surface energy budget and decreases sensible heat flux, mitigating air temperature rise. Accurate representation of the response to higher CO2 levels and of the coupling between the carbon and water cycles is therefore critical to forecasting seasonal climate, water cycle dynamics, and to enhance the accuracy of extreme event prediction under future climate.
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