Critical impact of vegetation physiology on the continental hydrologic cycle in response to increasing CO 2 .

Autor: Lemordant L; Earth and Environmental Engineering Department, Columbia University, New York, NY 10027; leo.lemordant@columbia.edu pg2328@columbia.edu., Gentine P; Earth and Environmental Engineering Department, Columbia University, New York, NY 10027; leo.lemordant@columbia.edu pg2328@columbia.edu.; Earth Institute, Columbia University, New York, NY 10025., Swann AS; Department of Atmospheric Sciences, University of Washington, Seattle, WA 98105.; Department of Biology, University of Washington, Seattle, WA 98195., Cook BI; NASA Goddard Institute for Space Studies, New York, NY 10025.; Ocean and Climate Physics, Lamont-Doherty Earth Observatory, Palisades, NY 10964., Scheff J; Department of Geography & Earth Sciences, University of North Carolina at Charlotte, Charlotte, NC 28223.
Jazyk: angličtina
Zdroj: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2018 Apr 17; Vol. 115 (16), pp. 4093-4098. Date of Electronic Publication: 2018 Apr 02.
DOI: 10.1073/pnas.1720712115
Abstrakt: Predicting how increasing atmospheric CO 2 will affect the hydrologic cycle is of utmost importance for a range of applications ranging from ecological services to human life and activities. A typical perspective is that hydrologic change is driven by precipitation and radiation changes due to climate change, and that the land surface will adjust. Using Earth system models with decoupled surface (vegetation physiology) and atmospheric (radiative) CO 2 responses, we here show that the CO 2 physiological response has a dominant role in evapotranspiration and evaporative fraction changes and has a major effect on long-term runoff compared with radiative or precipitation changes due to increased atmospheric CO 2 This major effect is true for most hydrological stress variables over the largest fraction of the globe, except for soil moisture, which exhibits a more nonlinear response. This highlights the key role of vegetation in controlling future terrestrial hydrologic response and emphasizes that the carbon and water cycles are intimately coupled over land.
Competing Interests: The authors declare no conflict of interest.
(Copyright © 2018 the Author(s). Published by PNAS.)
Databáze: MEDLINE
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