Analysis of long‐term aerosol size distribution data from Jungfraujoch with emphasis on free tropospheric conditions, cloud influence, and air mass transport
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Authors
Herrmann, Erik
Henne, Stephan
Vuilleumier, Laurent
Bukowiecki, Nicolas
Conen, Franz
Collaud Coen, Martine
Hammer, Emanuel
Jurányi, Zsófia
Author (Corporation)
Publication date
2015
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01A - Journal article
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Parent work
Journal of Geophysical Research: Atmospheres
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Volume
120
Issue / Number
18
Pages / Duration
9459-9480
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Publisher / Publishing institution
Wiley
Place of publication / Event location
Weinheim
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Abstract
Six years of aerosol size distribution measurements between 20 and 600 nm diameters and total aerosol concentration above 10 nm from March 2008 to February 2014 at the high‐alpine site Jungfraujoch are presented. The size distribution was found to be typically bimodal with mode diameters and widths relatively stable throughout the year and the observation period. New particle formation was observed on 14.5% of all days without a seasonal preference. Particles typically grew only into the Aitken mode and did not reach cloud condensation nucleus (CCN) sizes on the time scale of several days. Growth of preexisting particles in the Aitken mode, on average, contributed very few CCN. We concluded that the dominant fraction of CCN at Jungfraujoch originated in the boundary layer. A number of approaches were used to distinguish free tropospheric (FT) conditions and episodes with planetary boundary layer (PBL) influence. In the absence of PBL injections, the concentration of particles larger than 90 nm (N90, roughly corresponding to the CCN concentration) reached a value ~40 cm−3 while PBL influence caused N90 concentrations of several hundred or even 1000 cm−3. Comparing three criteria for free tropospheric conditions, we found FT prevalence for 39% of the time with over 60% during winter and below 20% during summer. It is noteworthy that a simple criterion based on standard trace gas measurements appeared to outperform alternative approaches.
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620 - Ingenieurwissenschaften und Maschinenbau
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2169-897X
2169-8996
2169-8996
Language
English
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Yes
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
HERRMANN, Erik, Ernest WEINGARTNER, Stephan HENNE, Laurent VUILLEUMIER, Nicolas BUKOWIECKI, Martin STEINBACHER, Franz CONEN, Martine COLLAUD COEN, Emanuel HAMMER, Zsófia JURÁNYI, Urs BALTENSPERGER und Martin GYSEL, 2015. Analysis of long‐term aerosol size distribution data from Jungfraujoch with emphasis on free tropospheric conditions, cloud influence, and air mass transport. Journal of Geophysical Research: Atmospheres. 2015. Bd. 120, Nr. 18, S. 9459–9480. DOI 10.1002/2015jd023660. Verfügbar unter: https://irf.fhnw.ch/handle/11654/44276