Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/32626
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dc.contributor.authorVarma, R. M.-
dc.contributor.authorBall, S. M.-
dc.contributor.authorBrauers, T.-
dc.contributor.authorDorn, H-P.-
dc.contributor.authorHeitmann, U.-
dc.contributor.authorJones, R. L.-
dc.contributor.authorPlatt, U.-
dc.contributor.authorPoehler, D.-
dc.contributor.authorRuth, A. A.-
dc.contributor.authorShillings, A. J. L.-
dc.contributor.authorThieser, J.-
dc.contributor.authorWahner, A.-
dc.contributor.authorVenables, D. S.-
dc.date.accessioned2015-07-13T13:51:55Z-
dc.date.available2015-07-13T13:51:55Z-
dc.date.issued2013-11-19-
dc.identifier.citationAtmospheric Measurement Techniques, 2013, 6 (11), pp. 3115-3130en
dc.identifier.issn1867-1381-
dc.identifier.urihttp://www.atmos-meas-tech.net/6/3115/2013/amt-6-3115-2013.htmlen
dc.identifier.urihttp://hdl.handle.net/2381/32626-
dc.description.abstractAbstract. Broadband optical cavity spectrometers are maturing as a technology for trace-gas detection, but only recently have they been used to retrieve the extinction coefficient of aerosols. Sensitive broadband extinction measurements allow explicit separation of gas and particle phase spectral contributions, as well as continuous spectral measurements of aerosol extinction in favourable cases. In this work, we report an intercomparison study of the aerosol extinction coefficients measured by three such instruments: a broadband cavity ring-down spectrometer (BBCRDS), a cavity-enhanced differential optical absorption spectrometer (CE-DOAS), and an incoherent broadband cavity-enhanced absorption spectrometer (IBBCEAS). Experiments were carried out in the SAPHIR atmospheric simulation chamber as part of the NO3Comp campaign to compare the measurement capabilities of NO[subscript: 3] and N[subscript: 2]O[subscript: 5] instrumentation. Aerosol extinction coefficients between 655 and 690 nm are reported for secondary organic aerosols (SOA) formed by the NO[subscript: 3] oxidation of β-pinene under dry and humid conditions. Despite different measurement approaches and spectral analysis procedures, the three instruments retrieved aerosol extinction coefficients that were in close agreement. The refractive index of SOA formed from the β-pinene + NO[subscript: 3] reaction was 1.61, and was not measurably affected by the chamber humidity or by aging of the aerosol over several hours. This refractive index is significantly larger than SOA refractive indices observed in other studies of OH and ozone-initiated terpene oxidations, and may be caused by the large proportion of organic nitrates in the particle phase. In an experiment involving ammonium sulfate particles, the aerosol extinction coefficients as measured by IBBCEAS were found to be in reasonable agreement with those calculated using the Mie theory. The results of the study demonstrate the potential of broadband cavity spectrometers for determining the optical properties of aerosols.en
dc.language.isoenen
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionen
dc.rightsCopyright © the authors, 2013. This is an open-access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/3.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.subjectScience & Technologyen
dc.subjectPhysical Sciencesen
dc.subjectMeteorology & Atmospheric Sciencesen
dc.subjectMETEOROLOGY & ATMOSPHERIC SCIENCESen
dc.subjectSIMULATION CHAMBER SAPHIRen
dc.subjectENHANCED ABSORPTION-SPECTROSCOPYen
dc.subjectREAL REFRACTIVE-INDEXESen
dc.subjectATMOSPHERIC TRACE GASESen
dc.subjectRING-DOWN SPECTROSCOPYen
dc.subjectOPTICAL-PROPERTIESen
dc.subjectALPHA-PINENEen
dc.subjectNEAR-ULTRAVIOLETen
dc.subjectCE-DOASen
dc.subjectWAVELENGTH DEPENDENCEen
dc.titleLight extinction by secondary organic aerosol: an intercomparison of three broadband cavity spectrometersen
dc.typeJournal Articleen
dc.identifier.doi10.5194/amt-6-3115-2013-
dc.identifier.eissn1867-8548-
dc.description.statusPeer-revieweden
dc.description.versionPublisher Versionen
dc.type.subtypeArticle;Journal-
pubs.organisational-group/Organisationen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistryen
dc.dateaccepted2013-10-24-
Appears in Collections:Published Articles, Dept. of Chemistry

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