14 documents found, page 1 of 2
Chemical composition and 87Sr/86Sr signatures of rainwaters from São Miguel, Az...
Ferreira, Letícia; Cruz, José Virgílio; Viveiros, Fátima; Durães, Nuno; Coutinho, Rui; Andrade, César; Santos, José FranciscoRainwater samples were collected at Furnas and Fogo volcanoes (São Miguel, Azores) in order to characterize their chemical signatures and to investigate a possible interaction with fumarolic gases. Marine aerosols contribute significantly to the chemistry of the rainwaters. The marine inputs ranges from 17.72 to 100 % for Cl-, 9.81 to 100 % for SO42-, 3.79 to 30.31 % for Ca2+, 34.09 to 48.12 % for Mg2+ and 17.2...
Detection of Geothermal Anomalies in Hydrothermal Systems Using ASTER Data: The...
Uchôa, Jéssica; Viveiros, Fátima; Tiengo, Rafaela; Gil, Artur José FreireABSTRACT: Current-day volcanic activity in the Azores archipelago is characterized by seismic events and secondary manifestations of volcanism. Remote sensing techniques have been widely employed to monitor deformation in volcanic systems, map lava flows, or detect high-temperature gas emissions. However, using satellite imagery, it is still challenging to identify low-magnitude thermal changes in a volcanic sy...
Os caça-vulcões
Viveiros, FátimaJá pensaste como será amar os vulcões a ponto de arriscar a vida e morrer só para os ver em erupção e ficar a conhecê-los melhor? O cinema e a literatura estão cheios de histórias de amor, algumas com fim trágico como Romeu e Julieta ou Pedro e Inês. Mas o casal romântico francês Katia e Maurice Krafft também ficou na História da Vulcanologia e da Humanidade, e no cinema, ao conquistar o mundo com o calor da la...
Ervilia castanea (Mollusca, Bivalvia) populations adversely affected at CO₂ see...
Martins, Marta; Silva, Marina Carreiro; Martins, Gustavo M.; Ramos, Joana B.; Viveiros, Fátima; Couto, Ruben P.; Parra, Hugo; Monteiro, JoãoSites with naturally high CO₂ conditions provide unique opportunities to forecast the vulnerability of coastal ecosystems to ocean acidification, by studying the biological responses and potential adaptations to this increased environmental variability. In this study, we investigated the bivalve Ervilia castanea in coastal sandy sediments at reference sites and at volcanic CO₂ seeps off the Azores, where the pH...
Enhancing anaerobic digestion of lignocellulose biomass using a thermophilic mi...
Teixeira, Mário; Ferreira, Ricardo; Toubarro, Duarte; Frias, Jorge; Cabral, Carla; Viveiros, Fátima; Rodriguez, Lucia; Alves, M. M.; Simões, NelsonIn nature, complex microbial communities catalyze cellulose hydrolysis by producing enzymes capable of breaking down cellulose polymers. Hydrolysis is a fundamental step in the carbon cycle of the industrial bioconversion of biomass to biofuels. The production of biofuels from biomass has become necessary, and the discovery of novel pretreatments is mandatory. The study of cellulose hydrolyzing bacterial commun...
Ervilia castanea (Mollusca, Bivalvia) populations adversely affected at CO2 see...
Martins, Marta; Carreiro-Silva, Marina; Martins, Gustavo M.; Barcelos e Ramos, Joana; Viveiros, Fátima; Couto, Ruben P.; Parra, Hugo; Monteiro, JoãoSites with naturally high CO2 conditions provide unique opportunities to forecast the vulnerability of coastal ecosystems to ocean acidification, by studying the biological responses and potential adaptations to this increased environmental variability. In this study, we investigated the bivalve Ervilia castanea in coastal sandy sediments at reference sites and at volcanic CO2 seeps off the Azores, where the pH...
Monitorização contínua de radão (222Rn) no ar interior de um edifício localizad...
Silva, Catarina; Viveiros, FátimaRESUMO: A monitorização contínua de radão (222Rn) no ar interior foi efetuada num edifício localizado no Vulcão das Furnas. Este corresponde a um dos vulcões centrais ativos da ilha de S. Miguel, sendo a desgaseifica ção neste aparelho vulcânico significativa. Dado o potencial cancerígeno associado à exposição ao 222Rn, a acumulação deste gás no interior de edifícios pode ser prejudicial para a saúde, podendo l...
Secondary manifestations of volcanism – an open window to understand geothermal...
Viveiros, Fátima; Silva, Catarina; Moreno, Lucia; Pacheco, Joana; Ferreira, T.Abstract: Gas geochemistry techniques applied to fumaroles and soil diffuse degassing areas constitute fundamental tools to understand deep geothermal reservoirs thermodynamic conditions and may provide valuable information both during the exploratory and production phases. Geothermometry applied to fumaroles located at Fogo (São Miguel Island) and Pico Alto (Terceira Island) volcanoes showed maximum feeding te...
Variações sazonais na monitorização contínua do fluxo de CO2 do solo no Vulcão ...
Pacheco, Joana; Viveiros, Fátima; Silva, Catarina; Ferreira, T.Resumo: Diversos estudos têm demonstrado que variáveis ambientais (e.g. meteorológicas) podem afetar a emissão de gases através dos solos, identificando, em alguns casos, variações sazonais na desgaseificação difusa de CO2 em regiões vulcânicas. O presente estudo pretende complementar os trabalhos realizados anteriormente no Vulcão das Furnas relacionados com a desgaseificação difusa de CO2, tendo como principa...
Fumarolic gas monitoring after an hydrothermal explosion at caldeira do Asmodeu...
Moreno, Lucia; Viveiros, Fátima; Silva, Catarina; Pacheco, Joana; Cojocariu, M.Abstract: On the 30th of August 2017 an explosion occurred in Caldeira do Asmodeu fumarole located in the Furnas Village fumarolic field, São Miguel Island. Local inhabitants reported that the turbidity of the water increased before the explosion and all the water disappeared immediately after the event. Subsequently, the water appeared with a muddy aspect. Sampling of the gases released from a close fumarole w...