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The increasing importance of atmospheric demand for ecosystem water and carbon fluxes, 2016


Novick, K.A, Ficklin, D.L, Stoy, P.C, Williams, C.A, Bohrer, G, Oishi, A.C, Papuga, S.A, Blanken, P.D, Noormets, A, Sulman, B.N


Nature Climate Change 6 :1023-1027
DOI: 10.1038/NCLIMATE3114
NWT Accession Number: NWT1901

Abstract

Soil moisture supply and atmospheric demand for water independently limit—and profoundly affect—vegetation productivity and water use during periods of hydrologic stress1–4 . Disentangling the impact of these two drivers on ecosystem carbon and water cycling is dificult 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 models5–7 . 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 sink8,9 . 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.

Keywords

Soil Moisture, Vegetation Productivity, Drought, Climate Change, Water Cycle, Carbon Cycle

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Citation

Novick, K.A, Ficklin, D.L, Stoy, P.C, Williams, C.A, Bohrer, G, Oishi, A.C, Papuga, S.A, Blanken, P.D, Noormets, A, Sulman, B.N, (2016) The increasing importance of atmospheric demand for ecosystem water and carbon fluxes. Nature Climate Change 6 :1023-1027 , DOI: 10.1038/NCLIMATE3114

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CU Boulder

This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.

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