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Absorption coefficients by aerosols in remote areas: a new approach to decouple dust and black carbon absorption coefficient using seven-wavelength Aethalometer data

2005-02Journal article Restricted access
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dc.contributor.authorFialho, Paulo
dc.contributor.authorHansen, Anthony
dc.contributor.authorHonrath, Richard
dc.date.accessioned2012-03-28T15:10:52Z
dc.date.available2012-03-28T15:10:52Z
dc.date.issued2005-02
dc.descriptionCopyright © 2004 Elsevier Ltd. All rights reserved.por
dc.description.abstractWe present a new approach to decouple aerosol absorption coefficients due to iron oxide in Sahara dust from those due to black carbon (BC) particles. Absorption coefficients, σaerosol(λ,t), were measured at the summit of Pico mountain (2225 m ASL) in the Azores Islands using a seven-wavelength Aethalometer. Measurements between 27th July and 1st August, 2001, are analyzed here. Variations in aerosol absorption coefficients were uncorrelated to those of CO during the latter part of this period, suggesting the presence of non-combustion-derived aerosol, apparently African dust. To differentiate between BC and other absorbing particles, we analyzed the wavelength dependence of σaerosol(λ,t) and determined a best-fit exponent during the later period equal to -2.9±0.2, somewhat lower than previously reported for soil dust. Using this method, it is possible to estimate the aerosol absorption due to BC and that due to soil dust separately through the full period analyzed.en
dc.description.sponsorshipFundação para a Ciência e Tecnologia (FCT-Portugal); Governo Regional dos Açores (Portugal); Força Aérea Portuguesa (FAP); Bombeiros Voluntários da Madalena do Pico (Portugal); United States National Oceanic and Atmospheric Administration (NOAA); United States National Science Foundation (NSF) Grants ATH-0215843 and INT-0110397; United States Air Force and Air Force Reserve (USAF)por
dc.identifier.citationFialho, P.S., A.D.A. Hansen, R.E.Honrath (2005). Absorption coefficients by aerosols in remote areas: a new approach to decouple dust and black carbon absorption coefficient using seven-wavelength Aethalometer data. “Journal of Aerosol Science”, 36(2), 267-282 [http://dx.doi.org/doi:10.1016/j.jaerosci.2004.09.004].por
dc.identifier.issn0021-8502
dc.identifier.urihttp://hdl.handle.net/10400.3/1330
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.relationPOCTI-32649-CTA-20por
dc.relation.ispartofseriesJournal of Aerosol Science;36(2)
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0021850204003398por
dc.subjectAbsorption Coefficientpor
dc.subjectBlack Carbonpor
dc.subjectIron Oxidespor
dc.subjectSahara Dustpor
dc.subjectAerosol Exponentspor
dc.subjectPICO-NAREpor
dc.subjectSeven-Wavelength Aethalometerpor
dc.titleAbsorption coefficients by aerosols in remote areas: a new approach to decouple dust and black carbon absorption coefficient using seven-wavelength Aethalometer dataen
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage282por
oaire.citation.issue2
oaire.citation.startPage267por
oaire.citation.titleJournal of Aerosol Sciencepor
oaire.citation.volume36
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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