Hydrologic resilience and Amazon productivity

Summary, in English

The Amazon rainforest is disproportionately important for global carbon storage and biodiversity. The system couples the atmosphere and land, with moist forest that depends on convection to sustain gross primary productivity and growth. Earth system models that estimate future climate and vegetation show little agreement in Amazon simulations. Here we show that biases in internally generated climate, primarily precipitation, explain most of the uncertainty in Earth system model results; models, empirical data and theory converge when precipitation biases are accounted for. Gross primary productivity, above-ground biomass and tree cover align on a hydrological relationship with a breakpoint at ~2000 mm annual precipitation, where the system transitions between water and radiation limitation of evapotranspiration. The breakpoint appears to be fairly stable in the future, suggesting resilience of the Amazon to climate change. Changes in precipitation and land use are therefore more likely to govern biomass and vegetation structure in Amazonia.

• Author: Anders Ahlström; Josep G. Canadell; Guy Schurgers; Minchao Wu; Joseph A. Berry; Kaiyu Guan; Robert B. Jackson
• Department/s: Dept of Physical Geography and Ecosystem Science; MERGE: ModElling the Regional and Global Earth system; BECC: Biodiversity and Ecosystem services in a Changing Climate
• Publishing year: 2017-12-01
• Language: English
• Publication/Series: Nature Communications
• Volume: 8
• Issue: 1
• Links: http://dx.doi.org/10.1038/s41467-017-00306-z
• Document type: Journal article
• Publisher: Nature Publishing Group
• Topic: Oceanography, Hydrology, Water Resources; Climate Research
• Status: Published
• ISBN/ISSN/Other: ISSN: 2041-1723