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Investigation of th...
Investigation of the Planetary Boundary Layer in the Swiss Alps Using Remote Sensing and In Situ Measurements
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Ketterer, C. (author)
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- Zieger, Paul (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Paul Scherrer Institute, Switzerland
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Bukowiecki, N. (author)
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Coen, M. Collaud (author)
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Maier, O. (author)
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Ruffieux, D. (author)
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Weingartner, E. (author)
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(creator_code:org_t)
- 2014-01-10
- 2014
- English.
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In: Boundary-layer Meteorology. - : Springer Science and Business Media LLC. - 0006-8314 .- 1573-1472. ; 151:2, s. 317-334
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https://doi.org/10.1...
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Keyword
- Boundary layer
- Ceilometer
- Complex topography
- In situ measurements
- Jungfraujoch
- Remote sensing
- Switzerland
- Wind profiler
Publication and Content Type
- ref (subject category)
- art (subject category)
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