@Article{BertaniWagnAndeArag:2017:ChFlDa,
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 = "07 maio 2024"
}