Hygroscopicity of the submicrometer aerosol at the high-alpine site Jungfraujoch, 3580 m a.s.l., Switzerland
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Authors
Sjögren, Staffan
Alfarra, M. Rami
Duplissy, Jonathan
Cozic, Julie
Crosier, Jonathan
Coe, Hugh
Baltensperger, Urs
Author (Corporation)
Publication date
30.09.2008
Typ of student thesis
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Type
01A - Journal article
Editors
Editor (Corporation)
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Parent work
Atmospheric Chemistry and Physics
Special issue
DOI of the original publication
Link
Series
Series number
Volume
8
Issue / Number
18
Pages / Duration
5715-5729
Patent number
Publisher / Publishing institution
Copernicus
Place of publication / Event location
Göttingen
Edition
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Abstract
Data from measurements of hygroscopic growth of submicrometer aerosol with a hygroscopicity tandem differential mobility analyzer (HTDMA) during four campaigns at the high alpine research station Jungfraujoch, Switzerland, are presented. The campaigns took place during the years 2000, 2002, 2004 and 2005, each lasting approximately one month. Hygroscopic growth factors (GF, i.e. the relative change in particle diameter from dry diameter, D0, to diameter measured at higher relative humidity, RH) are presented for three distinct air mass types, namely for: 1) free tropospheric winter conditions, 2) planetary boundary layer influenced air masses (during a summer period) and 3) Saharan dust events (SDE). The GF values at 85% RH (D0=100 nm) were 1.40±0.11 and 1.29±0.08 for the first two situations while for SDE a bimodal GF distribution was often found. No phase changes were observed when the RH was varied between 10–90%, and the continuous water uptake could be well described with a single-parameter empirical model. The frequency distributions of the average hygroscopic growth factors and the width of the retrieved growth factor distributions (indicating whether the aerosol is internally or externally mixed) are presented, which can be used for modeling purposes. Measurements of size resolved chemical composition were performed with an aerosol mass spectrometer in parallel to the GF measurements. This made it possible to estimate the apparent ensemble mean GF of the organics (GForg) using inverse ZSR (Zdanovskii-Stokes-Robinson) modeling. GForg was found to be ~1.20 at aw=0.85, which is at the upper end of previous laboratory and field data though still in agreement with the highly aged and oxidized nature of the Jungfraujoch aerosol.
Keywords
Subject (DDC)
550 - Geowissenschaften
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ISBN
ISSN
1680-7324
1680-7316
1680-7316
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Gold
License
Citation
SJÖGREN, Staffan, Martin GYSEL, Ernest WEINGARTNER, M. Rami ALFARRA, Jonathan DUPLISSY, Julie COZIC, Jonathan CROSIER, Hugh COE und Urs BALTENSPERGER, 2008. Hygroscopicity of the submicrometer aerosol at the high-alpine site Jungfraujoch, 3580 m a.s.l., Switzerland. Atmospheric Chemistry and Physics. 30 September 2008. Bd. 8, Nr. 18, S. 5715–5729. DOI 10.5194/acp-8-5715-2008. Verfügbar unter: https://doi.org/10.26041/fhnw-9745