DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Aerosol-Cloud Interactions in the Lower Free Troposphere as Measured at the High Alpine Research Station Jungfraujoch in Switzerland

Weingartner, Ernest and Verheggen, Bart and Cozic, Julie and Gysel, Martin and Sjorgen, Staffan and Duplissy, Jonathan and Lohmann, Ulrike and Mertes, Stefan and Bower, Keith N. and Flynn, Michael and Connolly, Paul and Crosier, Jonathan and Gallagher, Martin and Coe, Hugh and Choularton, Tom and Walter, Saskia and Schneider, Johannes and Curtius, Joachim and Borrmann, Stephan and Petzold, Andreas and Ebert, Martin and Inerle-Hof, M. and Worringen, A. and Weinbruch, Stephan and Fries, E. and Starokozhev, Elena and Püttmann, Wilhelm and Jaeschke, Wolfgang and Vana, M. and Hirsikko, A. and Tamm, E. and Aalto, P. and Kulmala, Markku (2006) Aerosol-Cloud Interactions in the Lower Free Troposphere as Measured at the High Alpine Research Station Jungfraujoch in Switzerland. In: 2006 International Aerosol Conference. 2006 International Aerosol Conference, 2006-09-10 - 2006-09-15, St Paul, MN (USA).

PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader


Within the WMO Global Atmosphere Watch (GAW) program continuous measurements of aerosol parameters have been performed at the Jungfraujoch high Alpine site since 1988. This measurement site is located on an exposed mountain col in the Bernese Alps, Switzerland, at 3580 meters altitude. Throughout the year the station is within clouds about 40% of the time. In warm months, the site is influenced by injection of planetary boundary layer air into the free troposphere during sunny afternoons due to thermal convection, while in winter it is usually in the undisturbed free troposphere. Several intensive field studies, named CLACE (Cloud and Aerosol Characterization Experiment), have been performed in both summer and winter within international collaborations. State-of-the-art instrumentation is employed to characterize the aerosol size distribution (Scanning Mobility Particle Sizer, SMPS; Optical Particle Counter, OPC). The University of Manchester and the Max Planck Institute in Mainz operated two Aerodyne Aerosol Mass Spectrometers (AMS) to measure the size segregated chemical composition. Other measured parameters were the hygroscopic properties of the particles (Hygroscopicity Tandem Differential Mobility Analyzer, H-TDMA), cloud microphysics (Particulate Volume Monitor, PVM; Forward Scattering Spectrometer Probe, FSSP; Cloud Particle Imager, CPI), and particle morphology (Environmental Scanning Electron Microscope, ESEM). An Air Ion Spectrometer (AIS) and an outdoor SMPS were also employed. The latter two instruments are especially well suited to measure nanometer sized particles (charged particles and sum of neutral and charged particles, respectively) in order to elucidate their formation mechanisms and rates. Different inlets are used for these instruments: A heated inlet (25°C) designed to prevent ice build-up and to evaporate cloud particles at an early stage, ensuring that the cloud condensation nuclei and/or ice nuclei are also sampled. This is called the total inlet. An interstitial inlet operated with a PM2 cyclone impactor removed all cloud droplets and ice crystals from the ambient air. Within a cloud the sampled air thus represents the interstitial (or unactivated) aerosol fraction. In addition, the Institute for Tropospheric Research (IFT) operated a Counterflow Virtual Impactor (CVI, Mertes et al., 2005). The CVI was part of a new prototype sampling system (Ice-CVI) that allows for the separation of small ice particles from large ice crystals, cloud droplets and interstitial aerosol particles. The extracted ice particles are dried airborne in the system and the remaining residual particles which correspond to the former ice nuclei were analyzed with a variety of different instruments. Differencing the response downstream of the different inlets provides insight in the fractionation of aerosol particles between the cloud phase and the interstitial phase.

Document Type:Conference or Workshop Item (Speech)
Title:Aerosol-Cloud Interactions in the Lower Free Troposphere as Measured at the High Alpine Research Station Jungfraujoch in Switzerland
AuthorsInstitution or Email of Authors
Weingartner, ErnestPaul Scherrer Inst., Villigen PSI, CH
Verheggen, BartPaul Scherrer Inst., Villigen PSI, CH
Cozic, JuliePaul Scherrer Inst., Villigen PSI, CH
Gysel, MartinPaul Scherrer Inst., Villigen PSI, CH
Sjorgen, StaffanPaul Scherrer Inst., Villigen PSI, CH
Duplissy, JonathanPaul Scherrer Inst., Villigen PSI, CH
Lohmann, UlrikeETH Zürich, Zürich, CH
Mertes, StefanLeibniz-Inst. for Tropospheric Research, Leipzig
Bower, Keith N.Univ. of Manchester, Manchester, UK
Flynn, MichaelUniv. of Manchester, Manchester, UK
Connolly, PaulUniv. of Manchester, Manchester, UK
Crosier, JonathanUniv. of Manchester, Manchester, UK
Gallagher, MartinUniv. of Manchester, Manchester, UK
Coe, HughUniv. of Manchester, Manchester, UK
Choularton, TomUniv. of Manchester, Manchester, UK
Walter, SaskiaMPI for Chemistry, Mainz
Schneider, JohannesMPI for Chemistry, Mainz
Curtius, JoachimMPI for Chemistry, Mainz
Borrmann, StephanMPI for Chemistry, Mainz
Petzold, AndreasUNSPECIFIED
Ebert, MartinTU Darmstadt, Darmstadt
Inerle-Hof, M.TU Darmstadt, Darmstadt
Worringen, A.TU Darmstadt, Darmstadt
Weinbruch, StephanTU Darmstadt, Darmstadt
Fries, E.Johann Wolfgang Goethe Univ., Frankfurt am Main
Starokozhev, ElenaJohann Wolfgang Goethe Univ., Frankfurt am Main
Püttmann, WilhelmJohann Wolfgang Goethe Univ., Frankfurt am Main
Jaeschke, WolfgangJohann Wolfgang Goethe Univ., Frankfurt am Main
Vana, M.Univ. of Helsinki, Helsinki, FIN
Hirsikko, A.Univ. of Helsinki, Helsinki, FIN
Tamm, E.Univ. of Tartu, Tartu, EST
Aalto, P.Univ. of Helsinki, Helsinki, FIN
Kulmala, MarkkuUniv. of Helsinki, Helsinki, FIN
Date:September 2006
Journal or Publication Title:2006 International Aerosol Conference
Refereed publication:No
In ISI Web of Science:No
Keywords:Cloud/Fog Aerosol Interactions, Atmospheric Nucleation, Measurement Campaigns
Event Title:2006 International Aerosol Conference
Event Location:St Paul, MN (USA)
Event Type:international Conference
Event Dates:2006-09-10 - 2006-09-15
Organizer:International Aerosol Research Assembly
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V UR - Schonung von Umwelt und Ressourcen (old)
DLR - Research area:Transport
DLR - Program:V UR - Schonung von Umwelt und Ressourcen
DLR - Research theme (Project):V - Umweltwirkungen des Verkehrs (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Petzold
Deposited On:02 Jul 2007
Last Modified:12 Dec 2013 20:25

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.