18 documents found, page 1 of 2
Atmospheric rivers in the Iberian Peninsula: connection with extratropical fron...
Luís, Diogo; Gama, Carla; Gonçalves, Cátia; Castanheira, José M.; Ramos, Alexandre M.; Sprenger, Michael; Gorodetskaya, Irina V.Precipitation over the Iberian Peninsula (IP) is highly sensitive to atmospheric rivers (ARs)—long corridors of anomalous horizontal and poleward moisture transport from lower latitudes. This study aims to deepen the understanding of the mechanisms behind Iberian ARs and to quantify their contribution to precipitation over a long-term period. We identify ARs affecting the IP in the ERA5 reanalysis with a 31-km ...
First exploratory study of gaseous pollutants (NO2, SO2, O3, VOCs and carbonyls...
Alves, Célia; Feliciano, Manuel; Gama, Carla; Vicente, Estela D.; Furst, Leonardo; Leitão, AnabelaAn air quality monitoring campaign for gaseous pollutants using passive sampling techniques was carried out, for the first time, at 25 locations in the metropolitan area of Luanda, Angola, in June 2023. Concentrations of benzene, toluene, ethylbenzene, xylenes, trimethylbenzenes, SO2 and NO2 were generally higher in locations more impacted by traffic. Benzene, SO2 and NO2 levels did not exceed the World Health ...
Ozone effects on Douro vineyards under climate change
Ascenso, Ana; Gama, Carla; Silveira, Carlos; Viceto, Carolina; Rocha, Alfredo; Lopes, Myriam; Miranda, Ana IsabelTropospheric ozone (O3) levels in southern Europe have an increasing tendency, in close relation with the higher incidence of hot summers and heatwaves. Given that O3 is one of the most damaging pollutants for vegetation, known to affect productivity and quality of crops, it is necessary to develop more rigorous and consistent methods of risk assessment that consider climate change conditions. Studying the O3 d...
PM10-Bound Sugars: Chemical Composition, Sources and Seasonal Variations
Gonçalves, Cátia; Rienda, Ismael Casotti; Pina, Noela; Gama, Carla; Nunes, Teresa; Tchepel, Oxana; Alves, CéliaThe presence of anhydrosugars and sugar alcohols in airborne articulate matter <10 m (PM10) samples collected between December 2018 and June 2019 was studied for two urban environments in Coimbra. Anhydrosugars were used to estimate the biomass burning contribution, and sugar alcohols were investigated regarding biological sources. Anhydrosugars contributed more than sugar alcohols to the total sugars, mainly l...
Dust Characterization and Its Potential Impact during the 2014-2015 Fogo Volcan...
Candeias, Carla; Ávila, Paula Freire; Alves, Célia; Gama, Carla; Sequeira, Cristina; Silva, E. Ferreira da; Rocha, FernandoABSTRACT: Fogo (Fogo Island) is the youngest and most active volcano of Cape Verde. The last eruption occurred in 2014-2015. Aiming to assess the dust sources that impacted the air quality during the present study period, fresh lava samples were collected, while Saharan dust intrusions and transport were modeled. Rooftop dust was also collected on the island dwellings and a mineralogical and chemical characteri...
Dust characterization and its potential impact during the 2014–2015 Fogo volcan...
Candeias, Carla; Ávila, Paula Freire; Alves, Célia; Gama, Carla; Sequeira, Cristina; Silva, Eduardo Ferreira da; Rocha, FernandoFogo (Fogo Island) is the youngest and most active volcano of Cape Verde. The last eruption occurred in 2014–2015. Aiming to assess the dust sources that impacted the air quality during the present study period, fresh lava samples were collected, while Saharan dust intrusions and transport were modeled. Rooftop dust was also collected on the island dwellings and a mineralogical and chemical characterization was...
Comparison of Methodologies for Assessing Desert Dust Contribution to Regional ...
Gama, Carla; Pio, Casimiro; Monteiro, Alexandra; Russo, Michael; Fernandes, Ana Patrícia; Borrego, Carlos; Baldasano, José María; Tchepel, OxanaDesert dust outbreaks may a ect air quality. This study estimates the importance of African dust contribution to the PM10 and PM2.5 concentrations observed in rural regional background sites in Portugal. Desert dust contribution is evaluated by two di erent approaches: Ameasurement-approach methodology based on the monthly moving 40th percentile, and a model-approach methodology based on WRF-CHIMERE simulations...
Avaliação da exposição da vinha duriense ao ozono em clima presente e futuro
Isabel Miranda, Ana; Ascenso, Ana; Silveira, Carlos; Blanco-Ward, Daniel; Gama, Carla; Monteiro, Alexandra; Viceto, Carolina; Rocha, AlfredoO ozono (O3) troposférico é um gás que pode danificar severamente a vegetação. Vários estudos identificam o efeito do O3 na perda de produtividade de campos agrícolas e na redução da qualidade de produtos vegetais e frutícolas. Este artigo foca-se na Região Demarcada do Douro, uma importante região vitivinícola portuguesa, e tem como objetivo a avaliação da exposição da vinha ao O3 troposférico, mediante a apli...
Avaliação da exposição da vinha duriense ao ozono em clima presente e futuro
Miranda, Ana Isabel; Ascenso, Ana; Silveira, Carlos; Blanco-Ward, Daniel; Gama, Carla; Monteiro, Alexandra; Viceto, Carolina; Rocha, AlfredoO ozono (O3) troposférico é um gás que pode danificar severamente a vegetação. Vários estudos identificam o efeito do O3 na perda de produtividade de campos agrícolas e na redução da qualidade de produtos vegetais e frutícolas. Este artigo foca-se na Região Demarcada do Douro, uma importante região vitivinícola portuguesa, e tem como objetivo a avaliação da exposição da vinha ao O3 troposférico, mediante a apli...
Assessing the risk of tropospheric ozone phytotoxic effect on Southern European...
Blanco-Ward, Daniel; Miranda, Ana Isabel; Silveira, Carlos; Ascenso, Ana; Gama, Carla; Monteiro, Alexandra; Lopes, Myriam; Borrego, Carlos S.Tropospheric ozone in Southern Europe has an increasing tendency in association with a greater incidence of warm summers and heatwaves. As there is already much evidence of the negative effects that current ambient ozone has on vegetation, there is a need for consistent risk assessment methods. Ozone plant exposure-based parameters have been used extensively to support decision-making. However, these parameters...