The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic

Egerer, Ulrike; Siebert, Holger; Hellmuth, Olaf; Sørensen, Lise Lotte

doi:https://doi.org/10.5194/acp-23-15365-2023

Articles | Volume 23, issue 24

https://doi.org/10.5194/acp-23-15365-2023

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

https://doi.org/10.5194/acp-23-15365-2023

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

Articles | Volume 23, issue 24

Research article

|

15 Dec 2023

Research article |

| 15 Dec 2023

The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic

Ulrike Egerer, Holger Siebert, Olaf Hellmuth, and Lise Lotte Sørensen

Data sets

Tethered balloon-borne measurements of turbulence and radiation during the Arctic field campaign PAMARCMiP in March/April 2018 U. Egerer et al. https://doi.org/10.1594/PANGAEA.900240

Short summary

Low-level jets (LLJs) are strong winds near the surface and occur frequently in the Arctic in stable conditions. Using tethered-balloon profile measurements in Greenland, we analyze a multi-hour period with an LLJ that later weakens and finally collapses. Increased shear-induced turbulence at the LLJ bounds mostly does not reach the ground until the LLJ collapses. Our findings support the hypothesis that a passive tracer can be advected with an LLJ and mixed down when the LLJ collapses.