An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient
Autor(a) principal: | |
---|---|
Data de Publicação: | 2011 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/5751 |
Resumo: | An integrating sphere spectral system has been developed that allows the measurement of continuous spectra of light absorption coefficients, saðlÞ of atmospheric aerosols. This system is based on the filter attenuation method covering the spectral wavelength range 320–800 nm with a variable spectral resolution. The sample filters had to be diluted in chloroform previous to the light attenuation measurements and hence the system cannot measure continuously but only on the basis of daily sampling. The system was calibrated using known amounts of absorbing and non-absorbing industrial substances at relevant atmospheric absorption levels. The resulting values of sa ðlÞ were compared with those delivered by a commercial photometer (particle soot absorption photometer) in the laboratory and also with field measurements, with a maximum discrepancy of 12.5% for atmospherically relevant values. The measurement uncertainty of the integrating sphere system is about 10% maximum. The importance of obtaining continuous spectral data is the possibility to determine the Ångström absorption exponent, aa , in different spectral ranges, including the UV. This exponent can then be used to help in obtaining the aerosol composition information. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
spelling |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficientAtmospheric aerosolsAbsorption coefficientsÅngström absorption exponentUVAn integrating sphere spectral system has been developed that allows the measurement of continuous spectra of light absorption coefficients, saðlÞ of atmospheric aerosols. This system is based on the filter attenuation method covering the spectral wavelength range 320–800 nm with a variable spectral resolution. The sample filters had to be diluted in chloroform previous to the light attenuation measurements and hence the system cannot measure continuously but only on the basis of daily sampling. The system was calibrated using known amounts of absorbing and non-absorbing industrial substances at relevant atmospheric absorption levels. The resulting values of sa ðlÞ were compared with those delivered by a commercial photometer (particle soot absorption photometer) in the laboratory and also with field measurements, with a maximum discrepancy of 12.5% for atmospherically relevant values. The measurement uncertainty of the integrating sphere system is about 10% maximum. The importance of obtaining continuous spectral data is the possibility to determine the Ångström absorption exponent, aa , in different spectral ranges, including the UV. This exponent can then be used to help in obtaining the aerosol composition information.uBibliorumMontilla, E.Mogo, SandraCachorro, VictoriaDe Frutos, Ángel M2018-08-27T15:34:26Z20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.6/5751eng10.1016/j.jaerosci.2011.01.003metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-15T09:43:46Zoai:ubibliorum.ubi.pt:10400.6/5751Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:46:33.079691Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
title |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
spellingShingle |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient Montilla, E. Atmospheric aerosols Absorption coefficients Ångström absorption exponent UV |
title_short |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
title_full |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
title_fullStr |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
title_full_unstemmed |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
title_sort |
An integrating sphere spectral system to measure continuous spectra of aerosol absorption coefficient |
author |
Montilla, E. |
author_facet |
Montilla, E. Mogo, Sandra Cachorro, Victoria De Frutos, Ángel M |
author_role |
author |
author2 |
Mogo, Sandra Cachorro, Victoria De Frutos, Ángel M |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
uBibliorum |
dc.contributor.author.fl_str_mv |
Montilla, E. Mogo, Sandra Cachorro, Victoria De Frutos, Ángel M |
dc.subject.por.fl_str_mv |
Atmospheric aerosols Absorption coefficients Ångström absorption exponent UV |
topic |
Atmospheric aerosols Absorption coefficients Ångström absorption exponent UV |
description |
An integrating sphere spectral system has been developed that allows the measurement of continuous spectra of light absorption coefficients, saðlÞ of atmospheric aerosols. This system is based on the filter attenuation method covering the spectral wavelength range 320–800 nm with a variable spectral resolution. The sample filters had to be diluted in chloroform previous to the light attenuation measurements and hence the system cannot measure continuously but only on the basis of daily sampling. The system was calibrated using known amounts of absorbing and non-absorbing industrial substances at relevant atmospheric absorption levels. The resulting values of sa ðlÞ were compared with those delivered by a commercial photometer (particle soot absorption photometer) in the laboratory and also with field measurements, with a maximum discrepancy of 12.5% for atmospherically relevant values. The measurement uncertainty of the integrating sphere system is about 10% maximum. The importance of obtaining continuous spectral data is the possibility to determine the Ångström absorption exponent, aa , in different spectral ranges, including the UV. This exponent can then be used to help in obtaining the aerosol composition information. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011 2011-01-01T00:00:00Z 2018-08-27T15:34:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.6/5751 |
url |
http://hdl.handle.net/10400.6/5751 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1016/j.jaerosci.2011.01.003 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799136361893068800 |