Topic modeling method for analyzing social actor discourses on climate change, energy and food security.
Debates on climate change, energy and food security concerns have underscored the need for new methods and tools to explore and understand the complexity of these relevant issues. In this study, we used unsupervised probabilistic modeling-latent Dirichlet allocation (LDA)-to examine the changes in s...
por Portal Padrão
publicado
16/12/2018
10:00 AM
Sustainability and governance of sugarcane ethanol companies in Brazil: topic modeling analysis of CSR reporting.
The current debate on corporate social responsibility was triggered by the understanding that companies should be responsible for mitigating the impacts of their activities on the society and the environment. In this paper, drawing on the structural power of business, we examine the rule-setting pow...
por Portal Padrão
publicado
16/12/2018
9:58 AM
Relationships between variability in precipitation, river levels, and beef cattle production in the Brazilian Pantanal.
The hydrology of the Brazilian Pantanal, part of the largest humid tropical area on the planet, follows the rhythm of seasonal floods. The traditional movement of cattle herds in the southern Pantanal is defined by these seasonal flooding patterns, which determine the availability and quality of nat...
por Portal Padrão
publicado
16/12/2018
9:56 AM
Beef cattle production systems in south Pantanal: considerations on territories and integration scales.
Pantanal is one of the largest wetlands in the world. In its southern portion, it hosts significant beef cattle ranching, having a herd of 4,832,200 head of cattle in 2016 (IBGE, 2018). Yet it presents intra-regional differences and complementarities. This article discusses such current territory de...
por Portal Padrão
publicado
16/12/2018
9:54 AM
21st Century drought-related fires counteract the decline of Amazon deforestation carbon emissions. Nature Communications, v.9, n.1, e536, 2018.
Tropical carbon emissions are largely derived from direct forest clearing processes. Yet, emissions from drought-induced forest fires are, usually, not included in national-level carbon emission inventories. Here we examine Brazilian Amazon drought impacts on fire incidence and associated forest fir...
por Portal Padrão
publicado
16/12/2018
9:52 AM
Measuring resilience and assessing vulnerability of terrestrial ecosystems to climate change in South America.
Climate change has been identified as the primary threat to the integrity and functioning of ecosystems in this century, although there is still much uncertainty about its effects and the degree of vulnerability for different ecosystems to this threat. Here we propose a new methodological approach c...
por Portal Padrão
publicado
16/12/2018
9:51 AM
Airborne laser scanning for terrain modeling in the Amazon forest.
Very few studies have been devoted to understanding the digital terrain model (DTM) creation for Amazon forests. DTM has a special and important role when airborne laser scanning is used to estimate vegetation biomass. We examined the influence of pulse density, spatial resolution, filter algorithms...
por Portal Padrão
publicado
16/12/2018
9:50 AM
Determining VOCs reactivity for ozone forming potential in the megacity of São Paulo.
High ozone (O-3) concentrations are a major concern about air quality in the Sao Paulo Metropolitan Area (SPMA). During 2016, the 8-hour state standard of 140 mu g m(-3) was exceeded on 32 days, whereas the 1-hour national standard of 160 mu g m(-3) was exceeded on 76 days. Exposure to such unhealth...
por Portal Padrão
publicado
16/12/2018
9:49 AM
Brazilian legislation on genetic heritage harms biodiversity convention goals and threatens basic biology research and education.
...
por Portal Padrão
publicado
16/12/2018
9:38 AM
State of the climate in 2017.
In 2017, the dominant greenhouse gases released into Earth's atmosphere-carbon dioxide, methane, and nitrous oxide-reached new record highs. The annual global average carbon dioxide concentration at Earth's surface for 2017 was 405.0 ± 0.1 ppm, 2.2 ppm greater than for 2016 and the highest in the m...
por Portal Padrão
publicado
16/12/2018
9:31 AM
Development and implementation of a new biomass burning emissions injection height scheme (BBEIH v1.0) for the GEOS-Chem model (v9-01-01).
Biomass burning is a significant source of trace gases and aerosols to the atmosphere, and the evolution of these species depends acutely on where they are injected into the atmosphere. GEOS-Chem is a chemical transport model driven by assimilated meteorological data that is used to probe a variety ...
por Portal Padrão
publicado
05/12/2018
2:44 PM
Season‐based rainfall–runoff modelling using the probability‐ distributed model (PDM) for large basins in southeastern Brazil.
Southeastern Brazil is characterized by seasonal rainfall variability. This can have a great social, economic, and environmental impact due to both excessive and deficient water availability. During 2014 and 2015, the region experienced one of the most severe droughts since 1960. The resulting water...
Redes Sociais