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

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

doi:https://doi.org/10.5194/wes-8-1651-2023

Articles | Volume 8, issue 11

https://doi.org/10.5194/wes-8-1651-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wes-8-1651-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

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

Supplement

https://doi.org/10.5194/wes-8-1651-2023-supplement

Data sets

ERA5 hourly data on single levels from 1940 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut https://doi.org/10.24381/cds.adbb2d47

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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.