Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling

A Characterisation of the dust transported from North Africa deserts to the Cape Verde Islands, including particle size distribution, concentrations and optical properties, for a complete annual cycle (the year 2011), is presented and discussed. The present analysis includes annual simulations of th...

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Autores: Gama, Carla, Tchepel, Oxana, Baldasano Recio, José María|||0000-0002-6191-635X, Basart Alpuente, Sara, Ferreira, Joana, Pio, Casimiro, Cardoso, Joao, Borrego, Carlos
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/27959
Acceso en línea:https://hdl.handle.net/2117/27959
https://dx.doi.org/10.3402/tellusb.v67.24410
Access Level:acceso abierto
Palabra clave:Mineral dust
Atmospheric aerosols
Air – Pollution
Air quality -- Measurement
Africa, North -- Environmental aspects
Desert dust modelling
PM measurements
Saharan and Sahelian dust
Cape Verde Islands
Long-range transport
Convective adjustment scheme
African dust
Desert dust
Size distribution
Aerosol characterization
Chemical-composition
Atmospheric aerosol
Mediterranean basin
Pols mineral
Aerosols atmosfèrics
Aire -- Contaminació
Aire -- Qualitat -- Mesurament
Àfrica del nord -- Aspectes ambientals
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Climatologia i meteorologia
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spelling Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modellingGama, CarlaTchepel, OxanaBaldasano Recio, José María|||0000-0002-6191-635XBasart Alpuente, SaraFerreira, JoanaPio, CasimiroCardoso, JoaoBorrego, CarlosMineral dustAtmospheric aerosolsAir – PollutionAir quality -- MeasurementAfrica, North -- Environmental aspectsDesert dust modellingPM measurementsSaharan and Sahelian dustCape Verde IslandsLong-range transportConvective adjustment schemeMineral dustAfrican dustDesert dustSize distributionAerosol characterizationChemical-compositionAtmospheric aerosolMediterranean basinPols mineralAerosols atmosfèricsAire -- ContaminacióAire -- Qualitat -- MesuramentÀfrica del nord -- Aspectes ambientalsÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèricaÀrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Climatologia i meteorologiaA Characterisation of the dust transported from North Africa deserts to the Cape Verde Islands, including particle size distribution, concentrations and optical properties, for a complete annual cycle (the year 2011), is presented and discussed. The present analysis includes annual simulations of the BSC-DREAM8b and the NMMB/BSC-Dust models, 1-yr of surface aerosol measurements performed within the scope of the CV-DUST Project, AERONET direct-sun observations, and back-trajectories. Aseasonal intrusion of dust from North West Africa affects Cape Verde at surface levels from October till March when atmospheric concentrations in Praia are very high (PM10 observed concentrations reach hourly values up to 710 mu g/m(3)). The air masses responsible for the highest aerosol concentrations in Cape Verde describe a path over the central Saharan desert area in Algeria, Mali and Mauritania before reaching the Atlantic Ocean. During summer, dust from North Africa is transported towards the region at higher altitudes, yielding to high aerosol optical depths. The BSC-DREAM8b and the NMMB/BSC-Dust models, which are for the first time evaluated for surface concentration and size distribution in Africa for an annual cycle, are able to reproduce the majority of the dust episodes. Results from NMMB/BSC-Dust are in better agreement with observed particulate matter concentrations and aerosol optical depth throughout the year. For this model, the comparison between observed and modelled PM10 daily averaged concentrations yielded a correlation coefficient of 0.77 and a 29.0 mu g/m(3) 'bias', while for BSC-DREAM8b the correlation coefficient was 0.63 and 'bias' 32.9 mu g/m(3). From this value, 12-14 mu g/m(3) is due to the sea salt contribution, which is not considered by the model. In addition, the model does not take into account biomass-burning particles, secondary pollutants and local sources (i.e., resuspension). These results roughly allow for the establishment of a yearly contribution of 42% of dust from North African deserts for PM10 levels observed in Cape Verde.20152015-01-0120152015-05-18journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/27959https://dx.doi.org/10.3402/tellusb.v67.24410reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/279592026-05-27T15:37:01Z
dc.title.none.fl_str_mv Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
title Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
spellingShingle Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
Gama, Carla
Mineral dust
Atmospheric aerosols
Air – Pollution
Air quality -- Measurement
Africa, North -- Environmental aspects
Desert dust modelling
PM measurements
Saharan and Sahelian dust
Cape Verde Islands
Long-range transport
Convective adjustment scheme
Mineral dust
African dust
Desert dust
Size distribution
Aerosol characterization
Chemical-composition
Atmospheric aerosol
Mediterranean basin
Pols mineral
Aerosols atmosfèrics
Aire -- Contaminació
Aire -- Qualitat -- Mesurament
Àfrica del nord -- Aspectes ambientals
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Climatologia i meteorologia
title_short Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
title_full Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
title_fullStr Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
title_full_unstemmed Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
title_sort Seasonal patterns of Saharan dust over Cape Verde : a combined approach using observations and modelling
dc.creator.none.fl_str_mv Gama, Carla
Tchepel, Oxana
Baldasano Recio, José María|||0000-0002-6191-635X
Basart Alpuente, Sara
Ferreira, Joana
Pio, Casimiro
Cardoso, Joao
Borrego, Carlos
author Gama, Carla
author_facet Gama, Carla
Tchepel, Oxana
Baldasano Recio, José María|||0000-0002-6191-635X
Basart Alpuente, Sara
Ferreira, Joana
Pio, Casimiro
Cardoso, Joao
Borrego, Carlos
author_role author
author2 Tchepel, Oxana
Baldasano Recio, José María|||0000-0002-6191-635X
Basart Alpuente, Sara
Ferreira, Joana
Pio, Casimiro
Cardoso, Joao
Borrego, Carlos
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Mineral dust
Atmospheric aerosols
Air – Pollution
Air quality -- Measurement
Africa, North -- Environmental aspects
Desert dust modelling
PM measurements
Saharan and Sahelian dust
Cape Verde Islands
Long-range transport
Convective adjustment scheme
Mineral dust
African dust
Desert dust
Size distribution
Aerosol characterization
Chemical-composition
Atmospheric aerosol
Mediterranean basin
Pols mineral
Aerosols atmosfèrics
Aire -- Contaminació
Aire -- Qualitat -- Mesurament
Àfrica del nord -- Aspectes ambientals
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Climatologia i meteorologia
topic Mineral dust
Atmospheric aerosols
Air – Pollution
Air quality -- Measurement
Africa, North -- Environmental aspects
Desert dust modelling
PM measurements
Saharan and Sahelian dust
Cape Verde Islands
Long-range transport
Convective adjustment scheme
Mineral dust
African dust
Desert dust
Size distribution
Aerosol characterization
Chemical-composition
Atmospheric aerosol
Mediterranean basin
Pols mineral
Aerosols atmosfèrics
Aire -- Contaminació
Aire -- Qualitat -- Mesurament
Àfrica del nord -- Aspectes ambientals
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Climatologia i meteorologia
description A Characterisation of the dust transported from North Africa deserts to the Cape Verde Islands, including particle size distribution, concentrations and optical properties, for a complete annual cycle (the year 2011), is presented and discussed. The present analysis includes annual simulations of the BSC-DREAM8b and the NMMB/BSC-Dust models, 1-yr of surface aerosol measurements performed within the scope of the CV-DUST Project, AERONET direct-sun observations, and back-trajectories. Aseasonal intrusion of dust from North West Africa affects Cape Verde at surface levels from October till March when atmospheric concentrations in Praia are very high (PM10 observed concentrations reach hourly values up to 710 mu g/m(3)). The air masses responsible for the highest aerosol concentrations in Cape Verde describe a path over the central Saharan desert area in Algeria, Mali and Mauritania before reaching the Atlantic Ocean. During summer, dust from North Africa is transported towards the region at higher altitudes, yielding to high aerosol optical depths. The BSC-DREAM8b and the NMMB/BSC-Dust models, which are for the first time evaluated for surface concentration and size distribution in Africa for an annual cycle, are able to reproduce the majority of the dust episodes. Results from NMMB/BSC-Dust are in better agreement with observed particulate matter concentrations and aerosol optical depth throughout the year. For this model, the comparison between observed and modelled PM10 daily averaged concentrations yielded a correlation coefficient of 0.77 and a 29.0 mu g/m(3) 'bias', while for BSC-DREAM8b the correlation coefficient was 0.63 and 'bias' 32.9 mu g/m(3). From this value, 12-14 mu g/m(3) is due to the sea salt contribution, which is not considered by the model. In addition, the model does not take into account biomass-burning particles, secondary pollutants and local sources (i.e., resuspension). These results roughly allow for the establishment of a yearly contribution of 42% of dust from North African deserts for PM10 levels observed in Cape Verde.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01
2015
2015-05-18
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/27959
https://dx.doi.org/10.3402/tellusb.v67.24410
url https://hdl.handle.net/2117/27959
https://dx.doi.org/10.3402/tellusb.v67.24410
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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