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Analysis of long-term aerosol size distribution data from Jungfraujoch with emphasis on free tropospheric conditions, cloud influence, and air mass transport
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 3438746
Author(s) Herrmann, Erik; Weingartner, Ernest; Henne, Stephan; Vuilleumier, Laurent; Bukowiecki, Nicolas; Steinbacher, Martin; Conen, Franz; Collaud Coen, Martine; Hammer, Emanuel; JurŠnyi, Zsofia; Baltensperger, Urs; Gysel, Martin
Author(s) at UniBasel Conen, Franz
Bukowiecki, Nicolas
Year 2015
Title Analysis of long-term aerosol size distribution data from Jungfraujoch with emphasis on free tropospheric conditions, cloud influence, and air mass transport
Journal Journal of Geophysical Research JGR / D - Atmospheres
Volume 120
Number 18
Pages / Article-Number 9459-9480
Keywords aerosol size distribution; free troposphere; boundary layer; cloud condensation nuclei; new particle formation; clouds
Mesh terms Science & TechnologyPhysical SciencesMeteorology & Atmospheric SciencesMeteorology & Atmospheric Sciences
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.
Publisher American Geophysical Union
ISSN/ISBN 2169-897X ; 2169-8996
URL http://onlinelibrary.wiley.com/doi/10.1002/2015JD023660/epdf
edoc-URL http://edoc.unibas.ch/42068/
Full Text on edoc No
Digital Object Identifier DOI 10.1002/2015JD023660
ISI-Number 000363425900025
Document type (ISI) Article
 
   

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