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Investigation of th...
Investigation of the Planetary Boundary Layer in the Swiss Alps Using Remote Sensing and In Situ Measurements
- Article/chapterEnglish2014
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2014-01-10
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Springer Science and Business Media LLC,2014
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-102945
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102945URI
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https://doi.org/10.1007/s10546-013-9897-8DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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AuthorCount:7;
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The development of the planetary boundary layer (PBL) has been studied in a complex terrain using various remote sensing and in situ techniques. The high-altitude research station at Jungfraujoch (3,580 m a.s.l.) in the Swiss Alps lies for most of the time in the free troposphere except when it is influenced by the PBL reaching the station, especially during the summer season. A ceilometer and a wind profiler were installed at Kleine Scheidegg, a mountain pass close to Jungfraujoch, located at an altitude of 2,061 m a.s.l. Data from the ceilometer were analyzed using two different algorithms, while the signal-to-noise ratio of the wind profiler was studied to compare the retrieved PBL heights. The retrieved values from the ceilometer and wind profiler agreed well during daytime and cloud-free conditions. The results were additionally compared with the PBL height estimated by the numerical weather prediction model COSMO-2, which showed a clear underestimation of the PBL height for most of the cases but occasionally also a slight overestimation especially around noon, when the PBL showed its maximum extent. Air parcels were transported upwards by slope winds towards Jungfraujoch when the PBL was higher than 2,800 m a.s.l. during cloud-free cases. This was confirmed by the in situ aerosol measurements at Jungfraujoch with a significant increase in particle number concentration, particle light absorption and scattering coefficients when PBL-influenced air masses reached the station in the afternoon hours. The continuous aerosol in situ measurements at Jungfraujoch were clearly influenced by the local PBL development but also by long-range transport phenomena such as Saharan dust or pollution from the south.
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Zieger, PaulStockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Paul Scherrer Institute, Switzerland(Swepub:su)pzieg
(author)
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Bukowiecki, N.
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Coen, M. Collaud
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Maier, O.
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Ruffieux, D.
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Weingartner, E.
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Stockholms universitetInstitutionen för tillämpad miljövetenskap (ITM)
(creator_code:org_t)
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In:Boundary-layer Meteorology: Springer Science and Business Media LLC151:2, s. 317-3340006-83141573-1472
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