| Title: | Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign |
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| Authors: | ID Yus-Díez, Jesús (Author)
ID Udina, Mireia (Author)
ID Soler, Maria Rosa (Author)
ID Lothon, Marie (Author)
ID Nilsson, Erik (Author)
ID Bech, Joan (Author)
ID Sun, Jielun (Author) |
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| Files: |  https://acp.copernicus.org/articles/19/9495/2019/
 acp-19-9495-2019.pdf (6,60 MB)
MD5: F8D12A9C9A609BD66F1188EB8EC5AA90
https://acp.copernicus.org/articles/19/9495/2019/acp-19-9495-2019.pdf
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| Language: | English |
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| Work type: | Unknown |
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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: | A night-time turbulence regime classification, the so-called “HOckey-Stick Transition ” (HOST) theory, proposed by Sun et al. (2012) from the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) is explored using data from the Boundary-Layer Late Afternoon and Sunset Turbulence (BLLAST) field campaign which took place during summer 2011 in the central French Pyrenean foothills. Results show that the HOST turbulence relationships for the BLLAST field campaign data are strongly dependent on both the meteorological and orographic features. The HOST pattern only appears for nights when a stably stratified boundary layer can be developed, corresponding to fair-weather and clear-sky nights, when the flow is generated by the nearby orography, from the south and the south-east. Those flows strongly influenced by the orography may generate intermittent or enhanced turbulence. When considering the whole nocturnal dataset for these flow directions, several enhanced turbulence points are found to be associated with sudden wind speed and directional shear transitions. In contrast, flows from other directions do not reproduce the HOST relationships and the turbulence relationship is almost linear, independent of vertical temperature gradients, corresponding to flows driven by synoptic scales. In addition we identify examples of gravity waves and top-down turbulent events that lead to transitions between the turbulence regimes. |
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| Keywords: | air turbulence, BLLAST campaign |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.01.2019 |
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| Year of publishing: | 2019 |
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| Number of pages: | str. 9495-9514 |
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| Numbering: | Vol. 19, issue 14 |
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| PID: | 20.500.12556/RUNG-9068  |
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| COBISS.SI-ID: | 195163139 |
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| UDC: | 502.3/.7 |
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| ISSN on article: | 1680-7324 |
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| eISSN: | 1680-7324 |
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| DOI: | 10.5194/acp-19-9495-2019 |
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| NUK URN: | URN:SI:UNG:REP:OOBZ6Y4H |
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| Publication date in RUNG: | 13.05.2024 |
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| Views: | 1112 |
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| Downloads: | 8 |
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