OPENAIRE OpenAire Datacite Spiral - Imperial College Digital Repository Dipòsit Digital de Documents de la UAB Sygma Bielefeld Academic Search Engine (BASE) eScholarship - University of California UnpayWall Recolector de Ciencia Abierta, RECOLECTA Crossref Microsoft Academic Graph European Union Open Data Portal http://www.nature.com/articles/s41561-019-0318-6.pdf https://escholarship.org/content/qt2hr7r7gk/qt2hr7r7gk.pdf https://doi.org/10044/1/67327 Nature Geoscience Open Access 2019-03-11 Satellite retrievals of information about the Earth's surface are widely used to monitor global terrestrial photosynthesis and primary production and to examine the ecological impacts of droughts. Methods for estimating photosynthesis from space commonly combine information on vegetation greenness, incoming radiation, temperature and atmospheric demand for water (vapour-pressure deficit), but do not account for the direct effects of low soil moisture. They instead rely on vapour-pressure deficit as a proxy for dryness, despite widespread evidence that soil moisture deficits have a direct impact on vegetation, independent of vapour-pressure deficit. Here, we use a globally distributed measurement network to assess the effect of soil moisture on photosynthesis, and identify a common bias in an ensemble of satellite-based estimates of photosynthesis that is governed by the magnitude of soil moisture effects on photosynthetic light-use efficiency. We develop methods to account for the influence of soil moisture and estimate that soil moisture effects reduce global annual photosynthesis by ~15%, increase interannual variability by more than 100% across 25% of the global vegetated land surface, and amplify the impacts of extreme events on primary production. These results demonstrate the importance of soil moisture effects for monitoring carbon-cycle variability and drought impacts on vegetation productivity from space. 550 0207 environmental engineering 02 engineering and technology 01 natural sciences Physical Geography and Environmental Geoscience USE EFFICIENCY NET PRIMARY PRODUCTION Meteorology & Atmospheric Sciences Geosciences, Multidisciplinary WATER-STRESS Physical geography and environmental geoscience 0105 earth and related environmental sciences 2. Zero hunger Multidisciplinary Science & Technology CLIMATE-CHANGE Ecology PHOTOSYNTHESIS Geology GROSS PRIMARY PRODUCTION Carbon cycle Biogeochemistry 15. Life on land FOREST 6. Clean water ATMOSPHERIC DEMAND 13. Climate action Physical Sciences Earth Sciences RADIATION CARBON UPTAKE Geosciences Benjamin D. Stocker, Jakob Zscheischler, Trevor F. Keenan, I. Colin Prentice, Sonia I. Seneviratne, Josep Peñuelas, 2019-03-11 journalpaper Satellite retrievals of information about the Earth's surface are widely used to monitor global terrestrial photosynthesis and primary production and to examine the ecological impacts of droughts. Methods for estimating photosynthesis from space commonly combine information on vegetation greenness, incoming radiation, temperature and atmospheric demand for water (vapour-pressure deficit), but do not account for the direct effects of low soil moisture. They instead rely on vapour-pressure deficit as a proxy for dryness, despite widespread evidence that soil moisture deficits have a direct impact on vegetation, independent of vapour-pressure deficit. Here, we use a globally distributed measurement network to assess the effect of soil moisture on photosynthesis, and identify a common bias in an ensemble of satellite-based estimates of photosynthesis that is governed by the magnitude of soil moisture effects on photosynthetic light-use efficiency. We develop methods to account for the influence of soil moisture and estimate that soil moisture effects reduce global annual photosynthesis by ~15%, increase interannual variability by more than 100% across 25% of the global vegetated land surface, and amplify the impacts of extreme events on primary production. These results demonstrate the importance of soil moisture effects for monitoring carbon-cycle variability and drought impacts on vegetation productivity from space. Drought impacts on terrestrial primary production underestimated by satellite monitoring 10044/1/67327 701329