Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires

Oduber, Fernanda; Calvo, Ana; Castro, Amaya; Blanco-Alegre, C.; Alves, Célia; Barata, Joana F. B.; Nunes, Teresa; Lucarelli, F.; Nava, S.; Calzolai, Giulia; Cerqueira, Mário; Martín-Villacorta, Javier; Esteves, Valdemar I.; Fraile, Roberto

doi:10.1016/j.scitotenv.2020.139202

Cited by 14 publications

(7 citation statements)

References 75 publications

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“…Rainwater pH can increase if it coincides with a dust event exceeding a value of 6.5 [38]. During dust events we only sampled snow, which did have higher values of pH (6.3), although they were the same for layers with and without records of a dust event.…”

Section: Evaluation Of Application Of Various Atmospheric Deposition ...mentioning

confidence: 99%

Characterization of Atmospheric Deposition as the Only Mineral Matter Input to Ombrotrophic Bog

2022

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Ombrotrophic peatlands contain a very small percentage of mineral matter that they receive exclusively from atmospheric deposition. Mineral matter deposited on the Šijec bog was characterized using scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). We collected solid atmospheric deposition from snow, rainwater, and using passive samplers. Samples were collected at average atmospheric conditions and after two dust events. Size, morphology, and chemical composition of individual particles were determined. We distinguished four main particle groups: silicates, carbonates, organic particles, and Fe-oxyhydroxides. Silicate particles are further divided into quartz and aluminosilicates. Proportions of these groups vary between samples and between sample types. In all samples, silicate particles predominate. Samples affected by dust events are richer in solid particles. This is well observed in passive deposition samples. Carbonates and organic particles represent smaller fractions and are probably of local origin. Iron-oxyhydroxides make up a smaller, but significant part of particles and are, according to their shape and chemical composition, of both geogenic and anthropogenic origin. Estimated quantity and percentage of main groups vary throughout the year and are highly dependent on weather conditions. Dust events represent periods of increased deposition and contribute significantly to mineral matter input to peatlands.

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Section: Evaluation Of Application Of Various Atmospheric Deposition ...mentioning

confidence: 99%

Characterization of Atmospheric Deposition as the Only Mineral Matter Input to Ombrotrophic Bog

2022

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“…Por otro lado, los aerosoles atmosféricos pueden sufrir cambios en sus características físicas y químicas debido a ciertas reacciones químicas que ocurren en la atmósfera, causando una serie de problemas medioambientales. Por ejemplo, los óxidos de nitrógeno (NO x ) y el dióxido de azufre (SO 2 ) pueden transformarse durante su transporte en ácidos nítrico y sulfúrico, respectivamente, para incorporarse en las nubes y en las gotas que precipitan disminuyendo el pH del agua de lluvia por debajo de 5,6, causando lo que se conoce como lluvia ácida (Akpo et al, 2015;Oduber et al, 2020;Oduber et al, 2021c). Este fenómeno trae como consecuencia la acidificación del agua terrestre y el subsecuente daño al ecosistema acuático, daños en la vegetación y en los materiales de construcción y estructuras (Seinfeld y Pandis, 2016).…”

Section: Impacto De Los Contaminantes Atmosféricos Sobre La Salud Hum...unclassified

“…de origen antropogénico principalmente, y en las altas concentraciones de carbono orgánico soluble e insoluble en agua (DOC y WIOC, respectivamente)(Oduber et al, 2020).…”

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calidad del aire que respiramos

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2022

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Con el incremento de las áreas urbanas y como consecuencia de la globalización es cada vez más necesario estudiar las implicaciones que tiene la calidad del aire en el clima y la salud. Este tipo de estudios permite establecer nuevos métodos de monitorización de la contaminación atmosférica, así como desarrollar las herramientas necesarias para mitigar el cambio climático y el número de enfermedades relacionadas con la contaminación del aire. Desde hace muchos años, en Europa se vienen realizando esfuerzos para reducir los niveles de contaminantes atmosféricos y así proteger la salud, la vegetación y los ecosistemas naturales. Además de las recomendaciones globales adoptadas en la Unión Europea, es necesario revisar las medidas específicas que acoge cada país y que van enfocadas a las emisiones y las necesidades locales y regionales. El grupo de investigación en Ambiente Atmosférico de la Universidad de León focaliza su actividad en el estudio de las características físicas y químicas del aerosol atmosférico, así como la sinergia que se establece entre los aerosoles y la precipitación como principal mecanismo de transporte de éstos hacia la superficie terrestre.

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“…The chemical composition of rainfall water is influenced by several factors, such as local emissions, pollution sources, meteorological conditions, and process of transportation [4,[10][11][12][13]. The chemical composition of atmospheric precipitation reveals the characteristics of regional air pollution to some extent [10,14]. In addition, knowledge of the chemical composition of rainfall not only indirectly reflects the atmospheric quality of specific regions but also provides useful information to help us understand the impact on ecosystems through deposition processes [10].…”

Section: Introductionmentioning

confidence: 99%

Chemical Compositions of Rainfall Water in Nyingchi City, Tibet

et al. 2022

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Understanding precipitation chemistry is highlighted as important worldwide due to its close relationship with air quality and impacts on ecosystems. However, the chemical composition of precipitation is limited in Tibet, where alpine ecosystems are sensitive to global change. Here, rainwater samples were collected in Nyingchi city from January 2021 to December 2021, and a total of 44 samples were obtained. Major ions (NO3−, NH4+, Cl−, SO42−, Na+, K+, Ca2+ and Mg2+) were analyzed. Results showed that the predominant ions in the precipitation were Ca2+, Na+, SO42−, and Cl−. Precipitation was mainly concentrated in summer, accounting for 65.2% of all samples collected during the monitoring period. As a result, ion deposition fluxes were mainly concentrated in summer, accounting for 55%, 53%, 84%, 82%, 61%, 63%, 75.8%, and 37.8% of the annual Ca2+, K+, Mg2+, Na+, NH4+, Cl−, SO42−, and NO3−, respectively. Backward trajectory analysis revealed that airmasses were mainly from the southern direction, but the sources varied widely. In addition, Na+ and Cl− ions were dominated by the sea source fraction; the ions of Ca2+ and K+ were dominated by crustal fraction sources. The NH4+ and NO3− ions were mainly influenced by local pollution. However, SO42− was mainly from long distance transports. Our results suggest that ions abundance was varied largely in different direction airmasses in southeast Tibet. Considering that ion deposition fluxes were mainly concentrated in the summer and the airmasses were mainly from the southern direction in this season, the pollutants from the southern direction the environmental effects of those ions should be given more attention in the future.

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Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires

Cited by 14 publications

References 75 publications

Characterization of Atmospheric Deposition as the Only Mineral Matter Input to Ombrotrophic Bog

Characterization of Atmospheric Deposition as the Only Mineral Matter Input to Ombrotrophic Bog

calidad del aire que respiramos

Chemical Compositions of Rainfall Water in Nyingchi City, Tibet

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