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dc.contributor.authorMcMeeking, G. R.
dc.contributor.authorGood, N.
dc.contributor.authorPetters, M. D.
dc.contributor.authorMcFiggans, G.
dc.contributor.authorCoe, H.
dc.date.accessioned2012-01-26T13:02:21Z
dc.date.available2012-01-26T13:02:21Z
dc.date.issued2011
dc.identifier.citationMcMeeking , G R , Good , N , Petters , M D , McFiggans , G & Coe , H 2011 , ' Influences on the fraction of hydrophobic and hydrophilic black carbon in the atmosphere ' , Atmospheric Chemistry and Physics , vol. 11 , no. 10 , pp. 5099-5112 . https://doi.org/10.5194/acp-11-5099-2011
dc.identifier.issn1680-7324
dc.identifier.otherPURE: 534276
dc.identifier.otherPURE UUID: ff4a22a6-97f5-488d-980b-d7a1688ccfe7
dc.identifier.otherWOS: 000291094500032
dc.identifier.otherScopus: 79957966427
dc.identifier.urihttp://hdl.handle.net/2299/7730
dc.description.abstractBlack carbon (BC) is a short term climate forcer that directly warms the atmosphere, slows convection, and hinders quantification of the effect of greenhouse gases on climate change. The atmospheric lifetime of BC particles with respect to nucleation scavenging in clouds is controlled by their ability to serve as cloud condensation nuclei (CCN). To serve as CCN under typical conditions, hydrophobic BC particles must acquire hygroscopic coatings. However, the quantitative relationship between coatings and hygroscopic properties for ambient BC particles is not known nor is the time scale for hydrophobic-to-hydrophilic conversion. Here we introduce a method for measuring the hygroscopicity of externally and internally mixed BC particles by coupling a single particle soot photometer with a humidified tandem differential mobility analyzer. We test this technique using uncoated and coated laboratory generated model BC compounds and apply it to characterize the hygroscopicity distribution of ambient BC particles. From these data we derive that the observed number fraction of BC that is CCN active at 0.2% supersaturation is generally low in an urban area near sources and that it varies with the trajectory of the airmass. We anticipate that our method can be combined with measures of air parcel physical and photochemical age to provide the first quantitative estimates for characterizing hydrophobic-to-hydrophilic conversion rates in the atmosphere.en
dc.format.extent14
dc.language.isoeng
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.rightsOpen
dc.subjectSINGLE-PARAMETER REPRESENTATION
dc.subjectDIFFERENTIAL MOBILITY ANALYZER
dc.subjectCONDENSATION NUCLEUS ACTIVITY
dc.subjectLASER-INDUCED INCANDESCENCE
dc.subjectPARTICLE SOOT PHOTOMETER
dc.subjectOPTICAL-PROPERTIES
dc.subjectHYGROSCOPIC GROWTH
dc.subjectSULFATE AEROSOLS
dc.subjectORGANIC AEROSOL
dc.subjectMIXING STATE
dc.titleInfluences on the fraction of hydrophobic and hydrophilic black carbon in the atmosphereen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2011
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.5194/acp-11-5099-2011
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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