On the interpretation of the loading correction of the aethalometer

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dc.contributor.author Virkkula, A.
dc.contributor.author Chi, X.
dc.contributor.author Ding, A.
dc.contributor.author Shen, Y.
dc.contributor.author Nie, W.
dc.contributor.author Qi, X.
dc.contributor.author Zheng, L.
dc.contributor.author Huang, X.
dc.contributor.author Xie, Y.
dc.contributor.author Wang, J.
dc.contributor.author Petäjä, T.
dc.contributor.author Kulmala, Markku
dc.date.accessioned 2016-05-11T11:51:02Z
dc.date.available 2016-05-11T11:51:02Z
dc.date.issued 2015
dc.identifier.citation Virkkula , A , Chi , X , Ding , A , Shen , Y , Nie , W , Qi , X , Zheng , L , Huang , X , Xie , Y , Wang , J , Petäjä , T & Kulmala , M 2015 , ' On the interpretation of the loading correction of the aethalometer ' , Atmospheric Measurement Techniques , vol. 8 , no. 10 , pp. 4415-4427 . https://doi.org/10.5194/amt-8-4415-2015
dc.identifier.other PURE: 56828211
dc.identifier.other PURE UUID: 961150b5-6cc0-467d-ae9a-11cd3450826c
dc.identifier.other WOS: 000364317600028
dc.identifier.other Scopus: 84945310141
dc.identifier.other ORCID: /0000-0002-1881-9044/work/102822898
dc.identifier.uri http://hdl.handle.net/10138/161779
dc.description.abstract Aerosol optical properties were measured with a seven-wavelength aethalometer and a three-wavelength nephelometer at the suburban site SORPES in Nanjing, China, in September 2013-January 2015. The aethalometer compensation parameter k, calculated with the Virkkula et al. (2007) method depended on the backscatter fraction, measured with an independent method, the integrating nephelometer. At lambda = 660 nm the daily averaged compensation parameter k approximate to 0.0017 +/- 0.0002 and 0.0042 +/- 0.0013 when backscatter fraction at lambda = 635 nm was in the ranges of 0.100 +/- 0.005 and 0.160 +/- 0.005, respectively. Also, the wavelength dependency of the compensation parameter depended on the backscatter fraction: when b(lambda = 525 nm) was less than approximately 0.13 the compensation parameter decreased with wavelength and at larger b it increased with wavelength. This dependency has not been considered in any of the algorithms that are currently used for processing aethalometer data. The compensation parameter also depended on the single-scattering albedo omega(0) so that k decreased with increasing omega(0). For the green light (lambda = 520 nm) in the omega(0) range 0.870 +/- 0.005, the average (+/- standard deviation) k approximate to 0.0047 +/- 0.006 and in the omega(0) range 0.960 +/- 0.005, k approximate to 0.0028 +/- 0.0007. This difference was larger for the near-infrared light (lambda = 880 nm): in the omega(0) range 0.860 +/- 0.005, k approximate to 0.0055 +/- 0.0023 and in the omega(0) range 0.960 +/- 0.005, k approximate to 0.0019 +/- 0.0011. The negative dependence of k on omega(0) was also shown with a simple theoretical analysis. en
dc.format.extent 13
dc.language.iso eng
dc.relation.ispartof Atmospheric Measurement Techniques
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject LIGHT-ABSORPTION
dc.subject BLACK CARBON
dc.subject PARTICLE
dc.subject NEPHELOMETER
dc.subject COEFFICIENT
dc.subject 114 Physical sciences
dc.title On the interpretation of the loading correction of the aethalometer en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Aerosol-Cloud-Climate -Interactions (ACCI)
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.5194/amt-8-4415-2015
dc.relation.issn 1867-1381
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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