The increasing importance of atmospheric demand for ecosystem water and carbon fluxes
Final Accepted Manuscript
AuthorNovick, Kimberly A.
Ficklin, Darren L.
Stoy, Paul C.
Williams, Christopher A.
Oishi, A. Christopher
Papuga, Shirley A.
Blanken, Peter D.
Sulman, Benjamin N.
Scott, Russell L.
Phillips, Richard P.
AffiliationUniversity of Arizona, School of Natural Resources and the Environment
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationThe increasing importance of atmospheric demand for ecosystem water and carbon fluxes 2016, 6 (11):1023 Nature Climate Change
JournalNature Climate Change
RightsCopyright © 2016, Rights Managed by Nature Publishing Group.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractSoil moisture supply and atmospheric demand for water independently limit-and profoundly affect-vegetation productivity and water use during periods of hydrologic stress(1-4). 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(5-7). 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 sink(8,9). 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.
NotePublished online 05 September 2016; 6 month embargo.
VersionFinal accepted manuscript
SponsorsUS Department of Energy; National Science Foundation (NSF) [DEB 1552747]; NSF [DEB 1552976, EF 1241881, EAR 125501, EAR 155489]; NOAA/GFDL-Princeton University Cooperative Institute for Climate Science