Higher global gross primary productivity under future climate with more advanced representations of photosynthesis.
- Resource Type
- Academic Journal
- Authors
- Knauer J; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.; CSIRO Environment, Canberra, ACT, Australia.; Cuntz M; Université de Lorraine, AgroParisTech, INRAE, UMR Silva, Nancy, France.; Smith B; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.; Canadell JG; CSIRO Environment, Canberra, ACT, Australia.; Medlyn BE; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.; Bennett AC; School of Ecosystem and Forest Science, University of Melbourne, Richmond, VIC, Australia.; Caldararu S; Botany, School of Natural Sciences, Trinity College Dublin, Dublin, Ireland.; iCRAG SFI Research Centre in Applied Geosciences.; Haverd V; CSIRO Environment, Canberra, ACT, Australia.
- Source
- Publisher: American Association for the Advancement of Science Country of Publication: United States NLM ID: 101653440 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 2375-2548 (Electronic) Linking ISSN: 23752548 NLM ISO Abbreviation: Sci Adv Subsets: MEDLINE
- Subject
- Language
- English
Gross primary productivity (GPP) is the key determinant of land carbon uptake, but its representation in terrestrial biosphere models (TBMs) does not reflect our latest physiological understanding. We implemented three empirically well supported but often omitted mechanisms into the TBM CABLE-POP: photosynthetic temperature acclimation, explicit mesophyll conductance, and photosynthetic optimization through redistribution of leaf nitrogen. We used the RCP8.5 climate scenario to conduct factorial model simulations characterizing the individual and combined effects of the three mechanisms on projections of GPP. Simulated global GPP increased more strongly (up to 20% by 2070-2099) in more comprehensive representations of photosynthesis compared to the model lacking the three mechanisms. The experiments revealed non-additive interactions among the mechanisms as combined effects were stronger than the sum of the individual effects. The modeled responses are explained by changes in the photosynthetic sensitivity to temperature and CO 2 caused by the added mechanisms. Our results suggest that current TBMs underestimate GPP responses to future CO 2 and climate conditions.