Seasonal variability of aerosol concentration and size distribution in Cape Verde using a continuous aerosol optical spectrometer
[EN] One year of, almost continuous, measurements of aerosol optical properties and chemical composition were performed at the outskirts of Praia, Santiago Island, Cape Verde,within the framework of CV-DUST (Atmospheric aerosol in Cape Verde region: seasonal evaluation of composition, sources and tr...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universidad de León |
| Repositorio: | BULERIA. Repositorio Institucional de la Universidad de León |
| OAI Identifier: | oai:buleria.unileon.es:10612/25883 |
| Acceso en línea: | https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2014.00015 https://hdl.handle.net/10612/25883 |
| Access Level: | acceso abierto |
| Palabra clave: | Física Meteorología Sahara dust Cape Verde PM level Size distribution Seasonal variation 2509.02 Contaminación Atmosférica 2501.05 Química Atmosférica 2501.16 Difusión (Atmosférica) |
| Sumario: | [EN] One year of, almost continuous, measurements of aerosol optical properties and chemical composition were performed at the outskirts of Praia, Santiago Island, Cape Verde,within the framework of CV-DUST (Atmospheric aerosol in Cape Verde region: seasonal evaluation of composition, sources and transport) research project, during 2011. This articlereports the aerosol number and mass concentration measurements using a GRIMM Optical Aerosol Spectrometer that provides number size discrimination into 31 size ranges from 0.25to32μm. Time series of 5 min average PM10 concentrations revealed peakvalues higher than 1000μg.m−3during winter dust storm events originating over NorthernAfrica. The 24 h average concentrations exceeded the World Health Organization (WHO) guidelines for PM2.5and PM10in 20 and 30% of the 2001 days, respectively. Annual average mass concentrations (±standard deviation) for PM1,PM2.5,and PM10 were 5±5,19±21, and 48±64μg.m−3, respectively. The annual PM2.5and PM10values were also above the limits prescribed by the WHO (10 and 20μg.m−3, respectively). The aerosolmass size distribution revealed two main modes for particles smaller than 10μm: a fine mode (0.7–0.8μm), which possibly results of gas to particle conversion processes; and a coarse mode with maxima at 3–4μm, which is associated with desert dust and sea saltsources. Within the coarse mode two sub-modes with maxima at 5–6 and 10–12μm were frequently present |
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