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Single particle characterization of black carbon aerosols at a tropospheric alpine site in Switzerland

Liu, D. und Flynn, M. und Gysel, M. und Targino, A. und Crawford, I. und Bower, K. und Choularton, T. und Juranyi, Z. und Steinbacher, M. und Hüglin, C. und Curtius, J. und Kampus, M. und Petzold, A. und Weingartner, E. und Baltensperger, U. und Coe, H. (2010) Single particle characterization of black carbon aerosols at a tropospheric alpine site in Switzerland. Atmospheric Chemistry and Physics, 10, Seiten 7389-7407. DOI: 10.5194/acp-10-7389-2010.

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Offizielle URL: http://www.atmos-chem-phys.net/10/7389/2010/

Kurzfassung

The refractory black carbon (rBC) mass, size distribution (190â��720 nm) and mixing state in submicron aerosols were characterized from late February to March 2007 using a single particle incandescence method at the high alpine research station Jungfraujoch (JFJ), Switzerland (46.33� N, 7.59� E, 3580m a.s.l.). JFJ is a ground based location, which is at times exposed to continental free tropospheric air. A median mass absorption coefficient (MAC) of 10.2�±3.2m2 gâ��1 at �=630 nm was derived by comparing single particle incandescence measurements of black carbon mass with continuous measurements of absorption coefficient. This value is comparable with other estimates at this location. The aerosols measured at the site were mostly well mixed and aged during transportation via the free troposphere. Pollutant sources were traced by air mass back trajectories, trace gases concentrations and the mass loading of rBC. In southeasterly wind directions, mixed or convective weather types provided the potential to vent polluted boundary layer air from the southern Alpine area and industrial northern Italy, delivering enhanced rBC mass loading and CN concentrations to the JFJ. The aerosol loadings at this site were also significantly influenced by precipitation, which led to the removal of rBC from the atmosphere. Precipitation events were shown to remove about 65% of the rBC mass from the free tropospheric background reducing the mean loading from 13�±5 ngmâ��3 to 6�±2 ngmâ��3(corrected to standard temperature and pressure). Overall, 40�±15% of the observed rBC particles within the detectable size range were mixed with large amounts of non-refractory materials present as a thick coating. The growth of particle size into the accumulation mode was positively linked with the degree of rBC mixing, suggesting the important role of condensable materials in increasing particle size and leading to enhanced internal mixing of these materials with rBC. It is the first time that BC mass, size distribution and mixing state are reported in the free troposphere over Europe. These ground based measurements also provide the first temporal study of rBC in the European free troposphere quantitatively measured by single particle methods. At the present time there is only limited information of BC and its mixing state in the free troposphere, especially above Europe. The results reported in this paper provide an important constraint on modelled representation of BC.

Dokumentart:Zeitschriftenbeitrag
Titel:Single particle characterization of black carbon aerosols at a tropospheric alpine site in Switzerland
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Liu, D.Univ. of Manchester, UK
Flynn, M.Univ. of Manchester, UK
Gysel, M.PSI, CH
Targino, A.Univ. of Manchester, UK
Crawford, I.Univ. of Manchester, UK
Bower, K.Univ. of Manchester, UK
Choularton, T.Univ. of Manchester, UK
Juranyi, Z.PSI, CH
Steinbacher, M.EMPA, CH
Hüglin, C.EMPA, CH
Curtius, J.Johannes Gutenberg Univ., Mainz
Kampus, M.Johannes Gutenberg Univ., Mainz
Petzold, A.DLR
Weingartner, E.PSI, CH
Baltensperger, U.PSI, CH
Coe, H.Univ. of Manchester, UK
Datum:2010
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:10
DOI :10.5194/acp-10-7389-2010
Seitenbereich:Seiten 7389-7407
Status:veröffentlicht
Stichwörter:black carbon MAAP SP2
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Verkehrssystem
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V VS - Verkehrssystem
DLR - Teilgebiet (Projekt, Vorhaben):V - Umweltwirkungen des Verkehrs (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Andreas Petzold
Hinterlegt am:08 Dez 2010 16:10
Letzte Änderung:12 Dez 2013 21:08

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