Search results for "Amazon rainforest"

MODIS-Based Monthly LST Products over Amazonia under Different Cloud Mask Schemes

2016

One of the major problems in the monitoring of tropical rainforests using satellite imagery is their persistent cloud coverage. The use of daily observations derived from high temporal resolution sensors, such as Moderate Resolution Imaging Spectroradiometer (MODIS), could potentially help to mitigate this issue, increasing the number of clear-sky observations. However, the cloud contamination effect should be removed from these results in order to provide a reliable description of these forests. In this study the available MODIS Land Surface Temperature (LST) products have been reprocessed over the Amazon Basin (10 N–20 S, 80 W–45 W) by introducing different cloud masking schemes. The mont…

Documentação digital da arte rupestre: apresentação e avaliação do método em dois sítios de Monte Alegre, Amazônia, Brasil

2013

Um dos aspectos mais importantes no estudo da arte rupestre é a documentação. No Brasil, são raros os trabalhos que apresentam os métodos e as técnicas empregados na documentação deste tipo de vestígio arqueológico. Grande parte dos estudos publicados no país está voltada para a classificação, a terminologia, as definições crono-estilísticas, interpretações e comparações entre conjuntos gráficos. Atualmente, a fotografia digital e os programas de manipulação de imagem constituem ferramentas de grande utilidade e precisão para a documentação da arte rupestre. Este artigo apresenta os resultados da aplicação do método do decalque digital na Amazônia, desenvolvido pelo Departamento de Arqueolo…

Preface: Amazonia in the route of General Relativity

2020

Editorial : Tropical Climate Variability and Change: Impacts in the Amazon

2019

Vast amounts of data from satellites and ground-based systems, and improvements on modeling techniques, allows a better understanding of Earth processes and advances on climate science. The tropics play a key role on global climate processes, and the tropical forest is a sensitive biome in the global hydrological and carbon cycles. In particular, the Amazon region includes about one half of the world’s tropical forest, and relatively small change in Amazon forest dynamics have the potential to substantially affect the rate of climate change. This Research Topics focus on recent finding on the impacts of tropical climate variability and change over the Amazon ecosystem using satellite data, …

Could cattle ranching and soybean cultivation be sustainable? A systematic review and a meta-analysis for the Amazon

2021

Abstract: Tropical forests are being destroyed to make space for agricultural activities with the assumption that they are required to feed the growing global population. Consequently, more sustainable practices are needed to guarantee food security and environmental protection of highly threatened natural biodiversity hotspots like the Amazon rainforest. Cattle ranching and soybean cultivation are by far the greater drivers of land use change and deforestation in the Amazon region. We performed a systematic review of papers related to these two main drivers and a meta-analysis on the effects of sustainable practices on different ecosystem services. The results of the review highlight a lar…

Imagining Africa and blackness in the Russian empire: from extra-textualarapkaand distant cannibals to Dahomey amazon shows – live in Moscow and Riga

2013

In the nineteenth century, Dahomey amazon shows, traveling circuses with menageries and ‘African villages,’ emerged as part of the transnational entertainment industry. This article extends the geography of this global model and generic system and its role in the visual politics of whiteness and blackness in a context outside the imperial colonization of Africa. The first sections examine a rise of visuality in the Russian imperial imagination of race, Africa and blackness through a ‘symptomatic’ reading of Aleksandr Griboedov's play Woe from Wit and Arkadii Averchenko's Death of an African Hunter. These are followed by a discussion of the Dahomey amazon shows in Moscow and their significan…

Sentinel 2 and 3 for Temperature Monitoring Over the Amazon

2018

In this work we present results of an early assessment of the performance of the Land Surface Temperature (LST) product retrieved from the Sea and Land Surface Temperature Radiometer (SLSTR) on board the Sentinel-3 satellite (S3/SLSTR) over the Amazon basin. Results are validated from comparison of S3/SLSTR retrievals against in situ measurements of surface temperature collected over one instrumented site in the Peruvian Amazon. The validation exercise was performed on the standard S3/SLSTR Level-2 LST product as well as on a dedicated LST split-window algorithm with an explicit dependence on surface emissivity. Surface emissivity maps obtained from the high spatial resolution of S2/MSI are…

Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data

2019

We analyzed seasonal and spatial variations of evapotranspiration (ET) for five Amazon sub-basins and their response to the 2015/16 El Nino episode using a recently developed water-budget approach. ET varied typically between similar to 7 and 10 cm/month with exception of the Xingu basin for which it varied between 10 and 15 cm/month. Outstanding features of ET seasonality are (i) generally weak seasonality, (ii) two ET peaks for the two very wet catchments Solimoes and Negro, with one occurring during the wet season and one during the drier season, and (iii) a steady increase of ET during the second half of the dry season for the three drier catchments (Madeira, Tapajos, Xingu). Peak ET oc…

Fire Responses to the 2010 and 2015/2016 Amazonian Droughts

2019

Extreme droughts in Amazonia cause anomalous increase in fire occurrence, disrupting the stability of environmental, social and economic systems. Thus, understanding how droughts affect fire patterns in this region is essential for anticipating and planning actions for remediation of possible impacts. Focused on the Brazilian Amazon biome, we investigated fire responses to the 2010 and 2015/2016 Amazonian droughts using a remote sensing data. Our results revealed that the 2015/2016 drought surpassed the 2010 drought in intensity and extent. During the 2010 drought, we found a maximum area of 846,800 km2 (24% of the Brazilian Amazon biome) with significant (p<0.05) rainfall decrease in the f…

Droughts Over Amazonia in 2005, 2010, and 2015: A Cloud Cover Perspective

2018

Amazon forests experienced recent severe droughts in an anomalous short period induced by different mechanisms and had different length periods and spatial patterns. Droughts of 2005 and 2010 were attributed to anomalous Sea Surface Temperature (SST) over the Tropical North Atlantic (TNA) during the dry season, but the 2010 drought was more severe and remained for a longer period because it was also induced in late 2009 by a moderate to strong El Niño (EN). Drought in 2015 led to unprecedented warming and extreme soil moisture deficits over some regions, and it was attributed to a very strong EN. Several studies analyzed these drought events regarding different climatic factors such as anom…