ElMasriSchwalmHuntzingerEtAl2019

Référence

El Masri, B., Schwalm, C., Huntzinger, D.N., Mao, J., Shi, X., Peng, C., Fisher, J.B., Jain, A.K., Tian, H., Poulter, B., Michalak, A.M. (2019) Carbon and Water Use Efficiencies: A Comparative Analysis of Ten Terrestrial Ecosystem Models under Changing Climate. Scientific reports, 9(1):14680. (Scopus )

Résumé

Terrestrial ecosystems carbon and water cycles are tightly coupled through photosynthesis and evapotranspiration processes. The ratios of carbon stored to carbon uptake and water loss to carbon gain are key ecophysiological indicators essential to assess the magnitude and response of the terrestrial plant to the changing climate. Here, we use estimates from 10 terrestrial ecosystem models to quantify the impacts of climate, atmospheric CO2 concentration, and nitrogen (N) deposition on water use efficiency (WUE), and carbon use efficiency (CUE). We find that across models, WUE increases over the 20th Century particularly due to CO2 fertilization and N deposition and compares favorably to experimental studies. Also, the results show a decrease in WUE with climate for the last 3 decades, in contrasts with up-scaled flux observations that demonstrate a constant WUE. Modeled WUE responds minimally to climate with modeled CUE exhibiting no clear trend across space and time. The divergence between simulated and observationally-constrained WUE and CUE is driven by modeled NPP and autotrophic respiration, nitrogen cycle, carbon allocation, and soil moisture dynamics in current ecosystem models. We suggest that carbon-modeling community needs to reexamine stomatal conductance schemes and the soil-vegetation interactions for more robust modeling of carbon and water cycles.

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@ARTICLE { ElMasriSchwalmHuntzingerEtAl2019,
    AUTHOR = { El Masri, B. and Schwalm, C. and Huntzinger, D.N. and Mao, J. and Shi, X. and Peng, C. and Fisher, J.B. and Jain, A.K. and Tian, H. and Poulter, B. and Michalak, A.M. },
    TITLE = { Carbon and Water Use Efficiencies: A Comparative Analysis of Ten Terrestrial Ecosystem Models under Changing Climate },
    JOURNAL = { Scientific reports },
    YEAR = { 2019 },
    VOLUME = { 9 },
    NUMBER = { 1 },
    PAGES = { 14680 },
    NOTE = { cited By 0 },
    ABSTRACT = { Terrestrial ecosystems carbon and water cycles are tightly coupled through photosynthesis and evapotranspiration processes. The ratios of carbon stored to carbon uptake and water loss to carbon gain are key ecophysiological indicators essential to assess the magnitude and response of the terrestrial plant to the changing climate. Here, we use estimates from 10 terrestrial ecosystem models to quantify the impacts of climate, atmospheric CO2 concentration, and nitrogen (N) deposition on water use efficiency (WUE), and carbon use efficiency (CUE). We find that across models, WUE increases over the 20th Century particularly due to CO2 fertilization and N deposition and compares favorably to experimental studies. Also, the results show a decrease in WUE with climate for the last 3 decades, in contrasts with up-scaled flux observations that demonstrate a constant WUE. Modeled WUE responds minimally to climate with modeled CUE exhibiting no clear trend across space and time. The divergence between simulated and observationally-constrained WUE and CUE is driven by modeled NPP and autotrophic respiration, nitrogen cycle, carbon allocation, and soil moisture dynamics in current ecosystem models. We suggest that carbon-modeling community needs to reexamine stomatal conductance schemes and the soil-vegetation interactions for more robust modeling of carbon and water cycles. },
    AFFILIATION = { Department of Earth and Environmental Sciences, Murray State University, KY, Murray, 42071, United States; Woods Hole Research Center, MA, Falmouth, 02540, United States; School of Earth Sciences and Environmental Sustainability, Northern Arizona University, AZ, Flagstaff, 86011, United States; Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, TN, Oak Ridge37831, United States; Department of Biological Sciences, University of Quebec at Montreal, QC, Montréal, H3C 3J7, Canada; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA; Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, 61801, United States; International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, 36849, USA; NASA Goddard Space Flight Center, MD, Greenbelt, 20771, United States; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, 94305, USA },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1038/s41598-019-50808-7 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073152142&doi=10.1038%2fs41598-019-50808-7&partnerID=40&md5=29d406959534233a4b3849bb667fde65 },
}

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