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Observation of viscosity transition in α-pinene secondary organic aerosol

Järvinen, E. ORCID iD icon; Ignatius, K.; Nichman, L.; Kristensen, T. B.; Fuchs, C.; Höppel, N.; Corbin, J. C.; Craven, J.; Duplissy, J.; Ehrhart, S.; El Haddad, I.; Frege, C.; Gates, S. J.; Gordon, H.; Hoyle, C. R.; Jokinen, T.; Kallinger, P.; Kirkby, J.; Kiselev, A.; ... mehr

Abstract:

Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requires knowledge of the temperature and relative humidity (RH) range for SOA to exist in these states. In the CLOUD experiment at CERN, we deployed a new in-situ optical method to detect the viscosity of α-pinene SOA particles and measured their transition from the amorphous viscous to liquid state. The method is based on the depolarising properties of laboratory-produced non-spherical SOA particles and their transformation to non-depolarising spherical liquid particles during deliquescence. We found that particles formed and grown in the chamber developed an asymmetric shape through coagulation. A transition to spherical shape was observed as the RH was increased to between 35 % at −10 °C and 80 % at −38 °C, confirming previous calculations of the viscosity transition conditions. Consequently, α-pinene SOA particles exist in a viscous state over a wide range of ambient conditions, including the cirrus region of the free troposphere. ... mehr


Volltext §
DOI: 10.5445/IR/1000052505
Originalveröffentlichung
DOI: 10.5194/acpd-15-28575-2015
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Aerosolforschung (IMKAAF)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7367
urn:nbn:de:swb:90-525050
KITopen-ID: 1000052505
HGF-Programm 12.01.02 (POF III, LK 01) Proc.res.f.multisc.predictab.of weather
Erschienen in Atmospheric Chemistry and Physics Discussions
Verlag European Geosciences Union (EGU)
Band 15
Heft 20
Seiten 28575-28617
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