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Overexploitation of groundwater is compromising river flows in Brazil, study warns
Publicado em 19 de fevereiro de 2025
More than half of Brazil's rivers are at risk of reduced flow due to water seeping into underground aquifers. This is the result of an analysis of 17,972 wells throughout the country. Of these, 55.4% had water levels below the surface of the nearest rivers. This difference in hydraulic level creates a gradient that favors the seepage of water from the river into the subsoil, which can turn rivers into water flow losers. The study, conducted by researchers from Brazil and abroad, [...]
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Capybaras found dead from rabies on Brazilian island underline need to monitor virus
Publicado em 19 dezembro 2024Three capybaras (Hydrochoerus hydrochaeris) died from rabies on Anchieta Island in the municipality of Ubatuba, São Paulo state, Brazil, between December 2019 and January 2020. One was found dead, and two exhibited hindlimb paralysis before dying. Analysis of their brains conducted at Instituto Pasteur in São Paulo city showed the cause of death to be rabies encephalitis. Source: phys.org Read Entire Article Sourcever notícia -
El Niño exacerbates effects of drought on Amazon groundwater and increases fire risk, study finds
Publicado em 13 dezembro 2024The risk of fires in the Amazon is greater in regions where groundwater storage is compromised, especially when El Niño exacerbates the drought. Using satellite images and data from fires, researchers have been able to demonstrate the relationship between the climatic phenomenon and the propensity for fires, creating a tool that could help with future prevention efforts. Source: phys.org Read Entire Article Sourcever notícia -
Researchers use high-resolution images to create model that predicts landslide risk in coastal areas
Publicado em 19 novembro 2024São Sebastião, a municipality on the coast of São Paulo state in Brazil that was partially cut off from the rest of the country in February 2023 after a period of torrential rain, had more than 1,000 landslide points, according to an inventory produced by researchers at the University of São Paulo's Institute of Astronomy, Geophysics and Atmospheric Sciences (IAG-USP) and Institute of Geosciences (IGc-USP) using aerial images collected shortly after the [...]ver notícia -
Brazilian researchers work to transform agave into the 'sugarcane of the sertão'
Publicado em 20 outubro 2024Climate change has caused an increase in the semi-arid climate region in Brazil. Data from the National Center for Monitoring and Warning of Natural Disasters (CEMADEN) and the National Institute of Space Research (INPE) in the South American country indicate an expansion of 7,500 square kilometers per year since 1990, which is equivalent to five times the area of the city of São Paulo. A similar phenomenon has been observed in some regions of Europe and North Africa.ver notícia -
How emissions from Brazilian Pantanal's soda lakes contribute to climate change
Publicado em 03 outubro 2024Seasonal variations with alternating dry and rainy seasons and fluctuating levels of nutrients are factors that significantly influence greenhouse gas emissions from soda lakes in the Pantanal, considered less common than emissions from freshwater lakes. The Pantanal is the world's largest tropical wetland, with an area of 153,000 km2, mostly (77.41%) in southwestern Brazil, but also partly in Bolivia (16.41%) and Paraguay (6.15%).ver notícia -
Study raises questions about validity of standard model of solar flares
Publicado em 23 setembro 2024Solar flares are extremely intense events that occur in the sun's atmosphere, lasting anywhere from a few minutes to several hours. According to the standard flare model, the energy that triggers these explosions is transported by accelerated electrons that hurtle from the magnetic reconnection region in the corona to the chromosphere. Source: phys.org Read Entire Article Sourcever notícia -
Deforestation in the Amazon is driven more by domestic demand than by the export market, finds study
Publicado em 21 setembro 2024Brazilian Legal Amazonia (BLA)—which comprises the entirety of the Amazon Basin located in Brazil and vast adjacent swathes of the Cerrado, spanning nine states—is more than 5 million square kilometers (km2) in area and corresponds to almost 60% of the country's land mass. Almost a quarter of this area (23%) has been deforested, and over 1 million km2 are degraded, so that the region risks reaching an ecological tipping point at which ecosystems collapse and billions of tons of [...]ver notícia -
Chip that entangles four photons opens up possibility of inviolable quantum encryption
Publicado em 13 agosto 2024Unlike classical encryption, which relies on mathematical algorithms, quantum encryption assures security based on physical principles. Detection of espionage or interference is guaranteed by unavoidable alteration of the quantum states involved. Source: phys.org Read Entire Article Sourcever notícia -
Organic farms certified by peers display higher product diversity
Publicado em 10 agosto 2024Agricultural classification of crops produced by organic farms in São Paulo state using the Participatory Guarantee System (PGS), 2020 . Credit: Organic Agriculture In Brazil, a study compared two systems of organic product certification implemented in São Paulo state. One system involves conventional certification by auditors accredited by the Ministry of Agriculture and the National Institute of Metrology, Quality and Technology (INMETRO). The other is peer-to-peer [...]ver notícia