30 documents found, page 1 of 3
How did the AD 1755 tsunami impact on sand barriers across the southern coast o...
Costa, Pedro J. M.; Costas, Susana; González-Villanueva, R.; Oliveira, M. A.; Roelvink, D.; Andrade, C.; Freitas, M. C.; Cunha, P. P.; Martins, A.Tsunamis are highly energetic events that may destructively impact the coast. Resolving the degree of coastal resilience to tsunamis is extremely difficult and sometimes impossible. In part, our understanding is constrained by the limited number of contemporaneous examples and by the high dynamism of coastal systems. In fact, longterm changes of coastal systems can mask the evidence of past tsunamis, leaving us...
Bromine enrichment in marsh sediments as a marker of environmental changes driv...
Moreno, J.; Fatela, F.; Leorri, E.; Araújo, M. F.; Moreno, F.; De la Rosa, J.; Freitas, M. C.; Valente, Teresa Maria Fernandes; Corbett, D. R.A sediment core collected in Caminha tidal marsh, NW Portugal, was used to assess bromine (Br) signal over the last ca. 1,700 years. The Br temporal variability reflects its close relationship with soil/sediment organic matter (OM) and also alterations in Br biogeochemical recycling in marsh environment. The highest Br enrichment in sediments was found during the Maunder Solar Minimum, a major solar event chara...
Association between atmospheric pollutants and hospital admissions in Lisbon
Cruz, A. M. J.; Sarmento, S.; Almeida, S. M.; Silva, A. V.; Alves, C.; Freitas, M. C.; Wolterbeek, H.Ambient air pollution is recognised as one of the potential environmental risk factors causing health hazards to the exposed population, demonstrated in numerous previous studies. Several longitudinal, ecological and epidemiological studies have shown associations between outdoor levels of outdoor atmospheric pollutants and adverse health effects, especially associated with respiratory and cardiovascular hospit...
Modelação geológica do enchimento sedimentar Plisto-Holocénico da paleolagu...
Lopes, V. P.; Freitas, M. C.; Andrade, C.; Taborda, R.A reconstrução paleoambiental das zonas húmidas litorais portuguesas constitui um elemento fundamental para o conhecimento da história evolutiva da zona costeira num passado geológico recente (Quaternário). Com a intenção de contribuir para o melhoramento do modelo de evolução da várzea da Nazaré (paleolaguna da Pederneira) durante o Plistocénico final e o Holocénico, procedeu-se à determinação...
Sedimentological characteristics of ice-wedge polygon terrain in Adventdalen (S...
Oliva, Marc; Vieira, Goncalo; Pina, P.; Pereira, P.; Neves, Mário; Freitas, M. C.Ice wedges are widespread periglacial features in the landscape of Adventdalen, Svalbard. The networks of ice wedges have created areas with well-developed polygonal terrains in the lowest fluvial terraces in this valley. We have examined the sedimentological characteristics of the northern and southern banks of the Advent river for palaeoenvironmental purposes. The base of two sedimentary sections reported rad...
Impact of Sahara dust transport on Cape Verde atmospheric element particles
Almeida-Silva, Marina; Almeida, Susana Marta; Freitas, M. C.; Pio, C. A.; Nunes, T.; Cardoso, J.The objectives of this study were to (1) conduct an elemental characterization of airborne particles sampled in Cape Verde and (2) assess the influence of Sahara desert on local suspended particles. Particulate matter (PM10) was collected in Praia city (14°94'N; 23°49'W) with a low-volume sampler in order to characterize its chemical composition by k0-INAA. The filter samples were first weighed and subsequently...
Impact of maritime air mass trajectories on the Western European coast urban ae...
Almeida, Susana Marta; Silva, A. I.; Freitas, M. C.; Dzung, H. M.; Caseiro, A.; Pio, C. A.Lisbon is the largest urban area in the Western European coast. Due to this geographical position the Atlantic Ocean serves as an important source of particles and plays an important role in many atmospheric processes. The main objectives of this study were to (1) perform a chemical characterization of particulate matter (PM2.5) sampled in Lisbon, (2) identify the main sources of particles, (3) determine PM con...
Fifteen years of nuclear techniques application to suspended particulate matter...
Almeida, S. M.; Freitas, M. C.; Reis, M.; Pinheiro, T.; Felix, P. M.; Pio, C. A.Acute and chronic exposures to Airborne Particulate Matter (APM) have been linked, in epidemiological studies, to increased mortality and to a wide spectrum of respiratory and cardiovascular disorders. One factor that highly influences the toxicity of APM is its chemical composition. Nuclear Analytical Techniques (NATs) can be advantageously used in the determination of the particles element composition due to ...
Impact of maritime air mass trajectories on the western european coast urban ae...
Almeida, S. M.; Silva, A. I.; Freitas, M. C.; Dzung, H. M.; Caseiro, A.; Pio, C. A.Lisbon is the largest urban area in the Western European coast. Due to this geographical position the Atlantic Ocean serves as an important source of particles and plays an important role in many atmospheric processes. The main objectives of this study were to (1) perform a chemical characterization of particulate matter (PM2.5) sampled in Lisbon, (2) identify the main sources of particles, (3) determine PM con...
Impact of Sahara dust transport on Cape Verde atmospheric element particles
Almeida-Silva, M.; Almeida, S. M.; Freitas, M. C.; Pio, C. A.; Nunes, T.; Cardoso, J.The objectives of this study were to (1) conduct an elemental characterization of airborne particles sampled in Cape Verde and (2) assess the influence of Sahara desert on local suspended particles. Particulate matter (PM(10)) was collected in Praia city (14°94'N; 23°49'W) with a low-volume sampler in order to characterize its chemical composition by k0-INAA. The filter samples were first weighed and subsequent...