{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T23:29:08Z","timestamp":1790724548489,"version":"4.1.0"},"reference-count":67,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2017,12,8]],"date-time":"2017-12-08T00:00:00Z","timestamp":1512691200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Amazonia is the world largest tropical forest, playing a key role in the global carbon cycle. Thus, understanding climate controls of photosynthetic activity in this region is critical. The establishment of the relationship between photosynthetic activity and climate has been controversial when based on conventional remote sensing-derived indices. Here, we use nine years of solar-induced chlorophyll fluorescence (ChlF) data from the Global Ozone Monitoring Experiment (GOME-2) sensor, as a direct proxy for photosynthesis, to assess the seasonal response of photosynthetic activity to solar radiation and precipitation in Amazonia. Our results suggest that 76% of photosynthesis seasonality in Amazonia is explained by seasonal variations of solar radiation. However, 13% of these forests are limited by precipitation. The combination of both radiation and precipitation drives photosynthesis in the remaining 11% of the area. Photosynthesis tends to rise only after radiation increases in 61% of the forests. Furthermore, photosynthesis peaks in the wet season in about 58% of the Amazon forest. We found that a threshold of \u22481943 mm per year can be defined as a limit for precipitation phenological dependence. With the potential increase in the frequency and intensity of extreme droughts, forests that have the photosynthetic process currently associated with radiation seasonality may shift towards a more water-limited system.<\/jats:p>","DOI":"10.3390\/rs9121275","type":"journal-article","created":{"date-parts":[[2017,12,8]],"date-time":"2017-12-08T11:37:40Z","timestamp":1512733060000},"page":"1275","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Chlorophyll Fluorescence Data Reveals Climate-Related Photosynthesis Seasonality in Amazonian Forests"],"prefix":"10.3390","volume":"9","author":[{"given":"Gabriel","family":"Bertani","sequence":"first","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research\u2013INPE, S\u00e3o Jos\u00e9 dos Campos 12227-010, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabien","family":"Wagner","sequence":"additional","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research\u2013INPE, S\u00e3o Jos\u00e9 dos Campos 12227-010, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9545-5136","authenticated-orcid":false,"given":"Liana","family":"Anderson","sequence":"additional","affiliation":[{"name":"National Center for Natural Disasters Monitoring\u2013CEMADEN, S\u00e3o Jos\u00e9 dos Campos 12247-016, SP, Brazil"},{"name":"Environmental Change Institute, University of Oxford, OX1 3QY Oxford, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luiz","family":"Arag\u00e3o","sequence":"additional","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research\u2013INPE, S\u00e3o Jos\u00e9 dos Campos 12227-010, SP, Brazil"},{"name":"College of Life and Environmental Sciences, University of Exeter, EX4 4RJ Exeter, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2017,12,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1038\/35041539","article-title":"Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model","volume":"408","author":"Cox","year":"2000","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Cox, P.M., Betts, R.A., Collins, M., Harris, P.P., Huntingford, C., and Jones, C.D. 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