Multi-decadal trends in global terrestrial evapotranspiration and its components
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Résumé
Evapotranspiration (ET) is the process by which liquid water becomes water vapor and energetically this accounts for much of incoming solar radiation. If this ET did not occur temperatures would be higher, so understanding ET trends is crucial to predict future temperatures. Recent studies have reported prolonged declines in ET in recent decades, although these declines may relate to climate variability. Here, we used a well-validated diagnostic model to estimate daily ET during 1981-2012, and its three components: transpiration from vegetation (Et), direct evaporation from the soil (Es) and vaporization of intercepted rainfall from vegetation (Ei). During this period, ET over land has increased significantly (p < 0.01), caused by increases in Et and Ei, which are partially counteracted by Es decreasing. These contrasting trends are primarily driven by increases in vegetation leaf area index, dominated by greening. The overall increase in Et over land is about twofold of the decrease in Es. These opposing trends are not simulated by most Coupled Model Intercomparison Project phase 5 (CMIP5) models, and highlight the importance of realistically representing vegetation changes in earth system models for predicting future changes in the energy and water cycle.
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La notice
- Revue
- Scientific Reports
- Thématique
- Plant Water Relations and Carbon Dynamics
- Domaine
- Environmental Science
- Établissements canadiens
- —
- Organismes subventionnaires
- Lawrence Berkeley National LaboratoryCanadian Foundation for Climate and Atmospheric SciencesOak Ridge National LaboratoryBiological and Environmental ResearchNatural Sciences and Engineering Research Council of CanadaCommonwealth Scientific and Industrial Research OrganisationUniversity of VirginiaNatural Resources CanadaUniversité LavalMicrosoft ResearchU.S. Department of EnergyNational Science Foundation
- Mots-clés
- EvapotranspirationCoupled model intercomparison projectEnvironmental scienceVegetation (pathology)Water cycleTranspirationAtmospheric sciencesClimate changeEvaporationClimatologyWater balancePhysical geographyClimate modelHydrology (agriculture)MeteorologyEcologyGeographyGeologyPhotosynthesisChemistry
- Résumé présent dans OpenAlex
- oui