Observation of viscosity transition in alpha-pinene secondary organic aerosol

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Järvinen , E , Ignatius , K , Nichman , L , Kristensen , T B , Fuchs , C , Hoyle , C R , Hoeppel , N , Corbin , J C , Craven , J , Duplissy , J , Ehrhart , S , El Haddad , I , Frege , C , Gordon , H , Jokinen , T , Kallinger , P , Kirkby , J , Kiselev , A , Naumann , K-H , Petäjä , T , Pinterich , T , Prevot , A S H , Saathoff , H , Schiebel , T , Sengupta , K , Simon , M , Slowik , J G , Troestl , J , Virtanen , A , Vochezer , P , Vogt , S , Wagner , A C , Wagner , R , Williamson , C , Winkler , P M , Yan , C , Baltensperger , U , Donahue , N M , Flagan , R C , Gallagher , M , Hansel , A , Kulmala , M , Stratmann , F , Worsnop , D R , Moehler , O , Leisner , T & Schnaiter , M 2016 , ' Observation of viscosity transition in alpha-pinene secondary organic aerosol ' , Atmospheric Chemistry and Physics , vol. 16 , no. 7 , pp. 4423-4438 . https://doi.org/10.5194/acp-16-4423-2016

Title: Observation of viscosity transition in alpha-pinene secondary organic aerosol
Author: Järvinen, Emma; Ignatius, Karoliina; Nichman, Leonid; Kristensen, Thomas B.; Fuchs, Claudia; Hoyle, Christopher R.; Hoeppel, Niko; Corbin, Joel C.; Craven, Jill; Duplissy, Jonathan; Ehrhart, Sebastian; El Haddad, Imad; Frege, Carla; Gordon, Hamish; Jokinen, Tuija; Kallinger, Peter; Kirkby, Jasper; Kiselev, Alexei; Naumann, Karl-Heinz; Petäjä, Tuukka; Pinterich, Tamara; Prevot, Andre S. H.; Saathoff, Harald; Schiebel, Thea; Sengupta, Kamalika; Simon, Mario; Slowik, Jay G.; Troestl, Jasmin; Virtanen, Annele; Vochezer, Paul; Vogt, Steffen; Wagner, Andrea C.; Wagner, Robert; Williamson, Christina; Winkler, Paul M.; Yan, Chao; Baltensperger, Urs; Donahue, Neil M.; Flagan, Rick C.; Gallagher, Martin; Hansel, Armin; Kulmala, Markku; Stratmann, Frank; Worsnop, Douglas R.; Moehler, Ottmar; Leisner, Thomas; Schnaiter, Martin
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016
Language: eng
Number of pages: 16
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/162500
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 Cosmics Leaving Outdoor Droplets (CLOUD) experiment at The European Organisation for Nuclear Research (CERN), we deployed a new in situ optical method to detect the viscous state of alpha-pinene SOA particles and measured their transition from the amorphous highly viscous state to states of lower viscosity. The method is based on the depolarising properties of laboratory-produced non-spherical SOA particles and their transformation to non-depolarising spherical particles at relative humidities near the deliquescence point. We found that particles formed and grown in the chamber developed an asymmetric shape through coagulation. A transition to a spherical shape was observed as the RH was increased to between 35aEuro-% at -10aEuro-A degrees C and 80aEuro-% at -38aEuro-A degrees C, confirming previous calculations of the viscosity-transition conditions. Consequently, alpha-pinene SOA particles exist in a viscous state over a wide range of ambient conditions, including the cirrus region of the free troposphere. This has implications for the physical, chemical, and ice-nucleation properties of SOA and SOA-coated particles in the atmosphere.
Subject: LINEAR DEPOLARIZATION RATIO
ICE NUCLEATION
CLOUD CHAMBER
NONSPHERICAL PARTICLES
ATMOSPHERIC AEROSOLS
OXIDATION-PRODUCTS
RELATIVE-HUMIDITY
MASS-SPECTROMETRY
GLASSY AEROSOLS
SOA PARTICLES
114 Physical sciences
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