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The increasing importance of atmospheric demand for ecosystem water and carbon fluxes

Nature climate change, 2016-11, Vol.6 (11), p.1023-1027 [Peer Reviewed Journal]

Copyright Nature Publishing Group Nov 2016 ;ISSN: 1758-678X ;EISSN: 1758-6798 ;DOI: 10.1038/nclimate3114

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  • Title:
    The increasing importance of atmospheric demand for ecosystem water and carbon fluxes
  • Author: Novick, Kimberly A. ; Ficklin, Darren L. ; Stoy, Paul C. ; Williams, Christopher A. ; Bohrer, Gil ; Oishi, A. Christopher ; Papuga, Shirley A. ; Blanken, Peter D. ; Noormets, Asko ; Sulman, Benjamin N. ; Scott, Russell L. ; Wang, Lixin ; Phillips, Richard P.
  • Is Part Of: Nature climate change, 2016-11, Vol.6 (11), p.1023-1027
  • Description: Soil moisture supply and atmospheric demand for water independently limit--and profoundly affect--vegetation productivity and water use during periods of hydrologic stress. Disentangling the impact of these two drivers on ecosystem carbon and water cycling is difficult because they are often correlated, and experimental tools for manipulating atmospheric demand in the field are lacking. Consequently, the role of atmospheric demand is often not adequately factored into experiments or represented in models. Here we show that atmospheric demand limits surface conductance and evapotranspiration to a greater extent than soil moisture in many biomes, including mesic forests that are of particular importance to the terrestrial carbon sink. Further, using projections from ten general circulation models, we show that climate change will increase the importance of atmospheric constraints to carbon and water fluxes in all ecosystems. Consequently, atmospheric demand will become increasingly important for vegetation function, accounting for >70% of growing season limitation to surface conductance in mesic temperate forests. Our results suggest that failure to consider the limiting role of atmospheric demand in experimental designs, simulation models and land management strategies will lead to incorrect projections of ecosystem responses to future climate conditions.
  • Publisher: London: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 1758-678X
    EISSN: 1758-6798
    DOI: 10.1038/nclimate3114
  • Source: ProQuest Central
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