Articles | Volume 8, issue 11
Brief communication
08 Nov 2023
Brief communication |  | 08 Nov 2023

Brief communication: On the definition of the low-level jet

Christoffer Hallgren, Jeanie A. Aird, Stefan Ivanell, Heiner Körnich, Rebecca J. Barthelmie, Sara C. Pryor, and Erik Sahlée

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Machine learning methods to improve spatial predictions of coastal wind speed profiles and low-level jets using single-level ERA5 data
Christoffer Hallgren, Jeanie A. Aird, Stefan Ivanell, Heiner Körnich, Ville Vakkari, Rebecca J. Barthelmie, Sara C. Pryor, and Erik Sahlée
Wind Energ. Sci., 9, 821–840,,, 2024
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The winds are twisting: analysis of strong directional shear across the rotor plane using coastal lidar measurements and ERA5
Christoffer Hallgren, Heiner Körnich, Stefan Ivanell, Ville Vakkari, and Erik Sahlée
Wind Energ. Sci. Discuss.,,, 2023
Preprint withdrawn
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Classification and properties of non-idealized coastal wind profiles – an observational study
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The smoother the better? A comparison of six post-processing methods to improve short-term offshore wind power forecasts in the Baltic Sea
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Thematic area: Wind and the atmosphere | Topic: Wind and turbulence
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Cited articles

Aird, J. A., Barthelmie, R. J., Shepherd, T. J., and Pryor, S. C.: WRF-simulated low-level jets over Iowa: characterization and sensitivity studies, Wind Energ. Sci., 6, 1015–1030,, 2021. a, b
Algarra, I., Eiras-Barca, J., Nieto, R., and Gimeno, L.: Global climatology of nocturnal low-level jets and associated moisture sources and sinks, Atmos. Res., 229, 39–59,, 2019. a
Baas, P., Bosveld, F., Klein Baltink, H., and Holtslag, A.: A climatology of nocturnal low-level jets at Cabauw, J. Appl. Meteorol. Clim., 48, 1627–1642,, 2009. a
Banta, R. M., Pichugina, Y. L., and Brewer, W. A.: Turbulent velocity-variance profiles in the stable boundary layer generated by a nocturnal low-level jet, J. Atmos. Sci., 63, 2700–2719,, 2006. a
Barthelmie, R. J., Shepherd, T. J., Aird, J. A., and Pryor, S. C.: Power and wind shear implications of large wind turbine scenarios in the US Central Plains, Energies, 13, 4269,, 2020. a, b
Short summary
Low-level jets (LLJs) are special types of non-ideal wind profiles affecting both wind energy production and loads on a wind turbine. However, among LLJ researchers, there is no consensus regarding which definition to use to identify these profiles. In this work, we compare two different ways of identifying the LLJ – the falloff definition and the shear definition – and argue why the shear definition is better suited to wind energy applications.
Final-revised paper