author = "Bertani, Gabriel and Wagner, Fabien Hubert and Anderson, Liana O. 
                         and Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Centro Nacional de 
                         Monitoramento e Alertas de Desastres Naturais (CEMADEN)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Chlorophyll fluorescence data reveals climate-related 
                         photosynthesis seasonality in Amazonian Forests",
              journal = "Remote Sensing",
                 year = "2017",
               volume = "9",
               number = "12",
             keywords = "climate seasonality, photosynthesis, ChlF, GOME-2, GLDAS.",
             abstract = "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 \≈1943 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.",
                  doi = "10.3390/rs9121275",
                  url = "http://dx.doi.org/10.3390/rs9121275",
                 issn = "2072-4292",
             language = "en",
           targetfile = "bertani_chlorogphyll.pdf",
        urlaccessdate = "04 dez. 2020"