| Title: | Lidar measurements of Bora wind effects on aerosol loading |
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| 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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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | Downslope wind
Lidar observations
Kelvin–Helmholtz waves
Bora |
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| Year of publishing: | 2017 |
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| Number of pages: | 39-45 |
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| Numbering: | 2017, 188 |
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| PID: | 20.500.12556/RUNG-2881-2af1a698-9e8d-328c-0d5d-08222d5bc2c9 |
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| COBISS.SI-ID: | 4626939 |
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| DOI: | http://dx.doi.org/10.1016/j.jqsrt.2016.05.020 |
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| NUK URN: | URN:SI:UNG:REP:X8AVSWYB |
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| Publication date in RUNG: | 06.01.2017 |
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| Views: | 6227 |
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| Downloads: | 0 |
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