@Article{AndersonRCFMDWA:2018:VuAmFo,
author = "Anderson, Liana Oighenstein and Ribeiro Neto, Germano and Cunha,
Ana Paula and Fonseca, Marisa Gesteira and Moura, Yhasmin Mendes
de and Dalagnol, Ricardo and Wagner, Fabien Hubert and
Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de",
affiliation = "{Centro Nacional de Monitoramento e Alertas de Desastres Naturais
(CEMADEN)} and {Centro Nacional de Monitoramento e Alertas de
Desastres Naturais (CEMADEN)} and {Centro Nacional de
Monitoramento e Alertas de Desastres Naturais (CEMADEN)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Lancaster
University} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Vulnerability of Amazonian forests to repeated droughts",
journal = "Philosophical Transactions of the Royal Society B: Biological
Sciences",
year = "2018",
volume = "373",
number = "1760",
month = "Oct.",
note = "{Pr{\^e}mio CAPES Elsevier 2023 - ODS 8: Trabalho decente e
crescimento econ{\^o}mico}",
abstract = "Extreme droughts have been recurrent in the Amazon over the past
decades, causing socio-economic and environmental impacts. Here,
we investigate the vulnerability of Amazonian forests, both
undisturbed and human-modified, to repeated droughts. We defined
vulnerability as a measure of (i) exposure, which is the degree to
which these ecosystems were exposed to droughts, and (ii) its
sensitivity, measured as the degree to which the drought has
affected remote sensing-derived forest greenness. The exposure was
calculated by assessing the meteorological drought, using the
standardized precipitation index (SPI) and the maximum cumulative
water deficit (MCWD), which is related to vegetation water stress,
from 1981 to 2016. The sensitivity was assessed based on the
enhanced vegetation index anomalies (AEVI), derived from the newly
available Moderate Resolution Imaging Spectroradiometer
(MODIS)/Multi-Angle Implementation of Atmospheric Correction
algorithm (MAIAC) product, from 2003 to 2016, which is indicative
of forest's photosynthetic capacity. We estimated that 46% of the
Brazilian Amazon biome was under severe to extreme drought in
2015/2016 as measured by the SPI, compared with 16% and 8% for the
2009/2010 and 2004/2005 droughts, respectively. The most recent
drought (2015/2016) affected the largest area since the drought of
1981. Droughts tend to increase the variance of the photosynthetic
capacity of Amazonian forests as based on the minimum and maximum
AEVI analysis. However, the area showing a reduction in
photosynthetic capacity prevails in the signal, reaching more than
400 000 km2 of forests, four orders of magnitude larger than areas
with AEVI enhancement. Moreover, the intensity of the negative
AEVI steadily increased from 2005 to 2016. These results indicate
that during the analysed period drought impacts were being
exacerbated through time. Forests in the twenty-first century are
becoming more vulnerable to droughts, with larger areas
intensively and negatively responding to water shortage in the
region.",
doi = "10.1098/rstb.2017.0411",
url = "http://dx.doi.org/10.1098/rstb.2017.0411",
issn = "1552-2814",
language = "en",
targetfile = "anderson_vulnerability.pdf",
urlaccessdate = "15 jun. 2024"
}