[1793] - Long-Term Observations and High-Resolution Modeling of Midlatitude Nocturnal Boundary Layer Processes Connected to Low-Level Jets

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Citation
Marke, T., Crewell, S., Schemann, V., Schween, J., Tuononen, M., 2018. Long-Term Observations and High-Resolution Modeling of Midlatitude Nocturnal Boundary Layer Processes Connected to Low-Level Jets. Journal of Applied Meteorology and Climatology, 57, 1155 - 1170. DOI: 10.1175/JAMC-D-17-0341.1.
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Identification
Title(s):Main Title: Long-Term Observations and High-Resolution Modeling of Midlatitude Nocturnal Boundary Layer Processes Connected to Low-Level Jets
Description(s):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(s):DOI: 10.1175/JAMC-D-17-0341.1
Responsible Party
Creator(s):Author: Tobias Marke
Author: Susanne Crewell
Author: Vera Schemann
Author: Jan Schween
Author: Minttu Tuononen
Publisher:American Meteorological Society
Topic
TR32 Topic:Atmosphere
Related Sub-project(s):D2
Subject(s):CRC/TR32 Keywords: Atmosphere, Remote Sensing, LES, Wind
Topic Category:ClimatologyMeteorologyAtmosphere
File Details
File Name:marke_et_al_jamc_2018.pdf
Data Type:Text
File Size:1835 kB (1.792 MB)
Date(s):Date Submitted: 2017-12-06
Date Accepted: 2018-03-18
Available: 2018-05-17
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
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
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Ellebach
Measurement Location:Jülich (research centre)
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2018
Type:Article
Article Type:Journal
Source:Journal of Applied Meteorology and Climatology
Volume:57
Number Of Pages:16
Page Range:1155 - 1170
Metadata Details
Metadata Creator:Tobias Marke
Metadata Created:2018-05-02
Metadata Last Updated:2018-06-18
Subproject:D2
Funding Phase:3
Metadata Language:English
Metadata Version:V42
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