Long-Term Observations and High-Resolution Modeling of Midlatitude Nocturnal Boundary Layer Processes Connected to Low-Level Jets

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Title:Main Title: Long-Term Observations and High-Resolution Modeling of Midlatitude Nocturnal Boundary Layer Processes Connected to Low-Level Jets
Description:Abstract: Low-level jet (LLJ) periods are investigated by exploiting a long-term record of ground-based remote sensing Doppler wind lidar measurements supported by tower observations and surface flux measurements at the Jülich ObservatorY for Cloud Evolution (JOYCE), a mid-latitude site in western Germany. LLJs can be found in 13% of the time during the continuous observations of over four years. The climatology of the LLJs shows the prevailing nighttime appearance of the jets, with a median height of 375 m and a median wind speed of 8.8 m s^-1 at the jet nose. Significant turbulence below the jet nose only occurs for high bulk wind shear, which is an important parameter for describing the turbulent characteristics of the jets. The numerous LLJs (16% of all jets) in the range of wind turbine rotor heights below 200 m demonstrates the importance of LLJs and the associated intermittent turbulence for wind energy applications. Also, a decrease in surface fluxes and an accumulation of CO_2 are observed if LLJs are present. The comprehensive analysis of an LLJ case exhibits the influence of the surrounding topography, dominated by an open pit mine and a 200 m high hill, on the wind observed at JOYCE. Complementing the measurements with high resolution large-eddy simulations, the spatial distribution of the wind field shows variations connected with the orographic flow depending on the wind direction, causing a high variability in the long-term measurements of the vertical velocity.
Identifier:10.1175/JAMC-D-17-0341.1 (DOI)
Responsible Party
Creators:Tobias Marke (Author), Susanne Crewell (Author), Vera Schemann (Author), Jan Schween (Author), Minttu Tuononen (Author)
Publisher:American Meteorological Society
Publication Year:2018
Topic
TR32 Topic:Atmosphere
Related Subproject:D2
Subjects:Keywords: Atmosphere, Remote Sensing, LES, Wind
Geogr. Information Topic:Climatology/Meteorology/Atmosphere
File Details
Filename:marke_et_al_jamc_2018.pdf
Data Type:Text - Article
File Size:1.8 MB
Dates:Submitted: 06.12.2017
Accepted: 18.03.2018
Available: 17.05.2018
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Journal of Applied Meteorology and Climatology
Volume:57
Number of Pages:16 (1155 - 1170)
Metadata Details
Metadata Creator:Tobias Marke
Metadata Created:02.05.2018
Metadata Last Updated:02.05.2018
Subproject:D2
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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