Observation of viscosity transition in α-pinene secondary organic aerosol

被引：55

作者：

Jaervinen, Emma ^{[1
]}

Ignatius, Karoliina ^{[2
]}

Nichman, Leonid ^{[3
]}

Kristensen, Thomas B. ^{[2
]}

Fuchs, Claudia ^{[4
]}

Hoyle, Christopher R. ^{[4
,9
]}

Hoeppel, Niko ^{[1
]}

Corbin, Joel C. ^{[4
]}

Craven, Jill ^{[5
]}

Duplissy, Jonathan ^{[6
,7
]}

Ehrhart, Sebastian ^{[8
]}

El Haddad, Imad ^{[4
]}

Frege, Carla ^{[4
]}

Gordon, Hamish ^{[8
]}

Jokinen, Tuija ^{[6
,7
]}

Kallinger, Peter ^{[10
]}

Kirkby, Jasper ^{[8
,11
]}

Kiselev, Alexei ^{[1
]}

Naumann, Karl-Heinz ^{[1
]}

Petaja, Tuukka ^{[6
,7
]}

Pinterich, Tamara ^{[10
]}

Prevot, Andre S. H. ^{[4
]}

Saathoff, Harald ^{[1
]}

Schiebel, Thea ^{[1
]}

Sengupta, Kamalika ^{[12
]}

Simon, Mario ^{[11
]}

Slowik, Jay G. ^{[4
]}

Troestl, Jasmin ^{[4
]}

Virtanen, Annele ^{[13
]}

Vochezer, Paul ^{[1
]}

Vogt, Steffen ^{[1
]}

Wagner, Andrea C. ^{[11
]}

Wagner, Robert ^{[1
]}

Williamson, Christina ^{[11
,14
,15
]}

Winkler, Paul M. ^{[10
]}

Yan, Chao ^{[6
,7
]}

Baltensperger, Urs ^{[4
]}

Donahue, Neil M. ^{[16
]}

Flagan, Rick C. ^{[17
]}

Gallagher, Martin ^{[3
]}

Hansel, Armin ^{[18
,19
]}

Kulmala, Markku ^{[6
,7
]}

Stratmann, Frank ^{[2
]}

Worsnop, Douglas R. ^{[20
]}

Moehler, Ottmar ^{[1
]}

Leisner, Thomas ^{[1
]}

Schnaiter, Martin ^{[1
]}

机构：

[1] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, POB 3640, D-76021 Karlsruhe, Germany

[2] Inst Tropospher Res TROPOS, D-04318 Leipzig, Germany

[3] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester M13 9PL, Lancs, England

[4] Paul Scherrer Inst, Lab Atmospher Chem, Villigen, Switzerland

[5] CALTECH, Dept Chem Engn, Pasadena, CA 91125 USA

[6] Helsinki Inst Phys, Helsinki, Finland

[7] Univ Helsinki, Dept Phys, Helsinki, Finland

[8] CERN, CH-1211 Geneva 23, Switzerland

[9] WSL Inst Snow & Avalanche Res SLF, Davos, Switzerland

[10] Univ Vienna, Fac Phys, Vienna, Austria

[11] Goethe Univ Frankfurt, Inst Atmospher & Environm Sci, Campus Riedberg Altenhoferallee 1, D-60438 Frankfurt, Germany

[12] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England

[13] Univ Eastern Finland, Dept Appl Phys, Kuopio, Finland

[14] NOAA, Earth Syst Res Lab, Div Chem Sci, 325 Broadway, Boulder, CO 80305 USA

[15] Univ Colorado, Cooperat Inst Res Environm Sci, UCB 216, Boulder, CO 80309 USA

[16] Carnegie Mellon Univ, Ctr Atmospher Particle Studies, 5000 Forbes Ave, Pittsburgh, PA 15213 USA

[17] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA

[18] Inst Ion & Appl Phys, A-6020 Innsbruck, Austria

[19] Ionicon Analyt GmbH, A-6020 Innsbruck, Austria

[20] Aerodyne Res Inc, Billerica, MA 01821 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2016年 / 16卷 / 07期

基金：

瑞士国家科学基金会; 美国国家科学基金会;

关键词：

LINEAR DEPOLARIZATION RATIO; ICE NUCLEATION; CLOUD CHAMBER; NONSPHERICAL PARTICLES; ATMOSPHERIC AEROSOLS; OXIDATION-PRODUCTS; RELATIVE-HUMIDITY; MASS-SPECTROMETRY; GLASSY AEROSOLS; SOA PARTICLES;

D O I：

10.5194/acp-16-4423-2016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：4423 / 4438

页数：16

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