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Title:Lidar measurements of Bora wind effects on aerosol loading
Authors:ID Mole, Maruška, Univerza v Novi Gorici (Author)
ID Wang, Longlong, Univerza v Novi Gorici (Author)
ID Stanič, Samo, Univerza v Novi Gorici (Author)
ID Bergant, Klemen, Univerza v Novi Gorici, Agencija Republike Slovenije za okolje (Author)
ID Eichinger, William, University of Iowa (Author)
ID Ocaña, Francisco, Universidad Complutense de Madrid (Author)
ID Strajnar, Benedikt, Agencija Republike Slovenije za okolje (Author)
ID Škraba, Primož, Institut Jožef Stefan (Author)
ID Vučković, Marko, Univerza v Novi Gorici (Author)
ID Willis, William, University of Iowa (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The Vipava valley in Slovenia is well known for the appearance of strong, gusty North-East Bora winds, which occur as a result of air flows over an adjacent orographic barrier. There are three revealing wind directions within the valley which were found to give rise to specific types of atmospheric structures. These structures were investigated using a Mie scattering lidar operating at 1064 nm, which provided high temporal and spatial resolution backscatter data on aerosols, which were used as tracers for atmospheric flows. Wind properties were monitored at the bottom of the valley and at the rim of the barrier using two ultrasonic anemometers. Twelve time periods between February and April 2015 were selected when lidar data was available. The periods were classified according to the wind speed and direction and investigated in terms of appearance of atmospheric structures. In two periods with strong or moderate Bora, periodic atmospheric structures in the lidar data were observed at heights above the mountain barrier and are believed to be Kelvin–Helmholtz waves, induced by wind shear. No temporal correlation was found between these structures and wind gusts at the ground level. The influence of the wind on the height of the planetary boundary layer was studied as well. In periods with low wind speeds, the vertical evolution of the planetary boundary layer was found to be governed by solar radiation and clouds. In periods with strong or moderate Bora wind, convection within the planetary boundary layer was found to be much weaker due to strong turbulence close to the ground, which inhibited mixing through the entire layer.
Keywords:Downslope wind Lidar observations Kelvin–Helmholtz waves Bora
Year of publishing:2017
Number of pages:39-45
Numbering:2017, 188
PID:20.500.12556/RUNG-2881-2af1a698-9e8d-328c-0d5d-08222d5bc2c9 New window
COBISS.SI-ID:4626939 New window
DOI: New window
Publication date in RUNG:06.01.2017
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Record is a part of a journal

Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Shortened title:JQSRT
Year of publishing:2017