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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The application of a multi-wavelength aethalometer to estimate iron dust and black carbon concentrations in the marine boundary layer of cape verde
Atmospheric Environment, Volume 97, Year 2014
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Description
The two-component model (Fialho etal., 2006) was used to decouple the contributions of black carbon (BC) and iron oxides, present in dust, to the aerosol attenuation coefficient, measured with a multi-wavelength Aethalometer. The model results were compared with the elemental carbon (EC) and iron concentrations determined in the laboratory from the analysis of aerosol particles collected with conventional samplers. The comparison was based on one year of data obtained at Praia, Santiago Island, Cape Verde, after side by side operation of the aerosol monitoring instruments. The linear regression equation that best describes the relationship between BC concentrations, derived from the Aethalometer, and EC concentrations, derived from a PM10 high-volume sampler after filter analysis with a thermal optical method, presents a slope of 1.01±0.05 and a correlation coefficient (r) of 0.90, showing that the model worked as intended to describe BC concentrations without interferences from iron dust. On the other hand, the linear regression equation that best describes the relationship between the iron concentrations derived from the Aethalometer and elemental iron concentrations, derived from a PM10 low-volume sampler after filter analysis by k0 - Instrumental Neutron Activation Analysis, presents a slope of 0.495±0.014 and a correlation coefficient (r) of 0.96. These results show that the two-component model underestimated the iron concentrations in dust aerosol, which was explained by differences in the size range of particles sampled with the Aethalometer and the PM10 low-volume sampler together with differences in the size distribution of iron oxides. © 2014 Elsevier Ltd.
Authors & Co-Authors
Fialho, P.
Portugal, Ponta Delgada
Universidade Dos Açores
Cerqueira, M.
Portugal, Aveiro
Universidade de Aveiro
Pio, Casimiro Adrião
Portugal, Aveiro
Universidade de Aveiro
Cardoso, J.
Portugal, Aveiro
Universidade de Aveiro
Cape Verde, Praia
Universidade de Cabo Verde
Nunes, T.
Portugal, Aveiro
Universidade de Aveiro
Custódio, D.
Portugal, Aveiro
Universidade de Aveiro
Alves, Célia Anjos
Portugal, Aveiro
Universidade de Aveiro
Almeida, Susana M.
Portugal, Lisbon
Universidade de Lisboa
Almeida-Silva, M.
Portugal, Lisbon
Universidade de Lisboa
Reis, M.
Portugal, Lisbon
Universidade de Lisboa
Rocha, Fernando T.F.T.
Portugal, Aveiro
Universidade de Aveiro
Statistics
Citations: 15
Authors: 11
Affiliations: 4
Identifiers
Doi:
10.1016/j.atmosenv.2014.08.008
e-ISSN:
18732844
Research Areas
Environmental
Study Locations
Cabo Verde