The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic
In this study, we analyze the transition of a stable atmospheric boundary layer (ABL) with a low-level jet (LLJ) to a traditional stable ABL with a classic Ekman helix in the late-winter central Arctic. Vertical profiles in the ABL were measured with a hot-wire anemometer on a tethered balloon durin...
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2023
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Online Access: | https://doi.org/10.5194/acp-23-15365-2023 https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58 |
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ftdoajarticles:oai:doaj.org/article:9baf71a381864c1cb3e4d58f3e445c58 2024-01-14T10:04:04+01:00 The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic U. Egerer H. Siebert O. Hellmuth L. L. Sørensen 2023-12-01T00:00:00Z https://doi.org/10.5194/acp-23-15365-2023 https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58 EN eng Copernicus Publications https://acp.copernicus.org/articles/23/15365/2023/acp-23-15365-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-15365-2023 1680-7316 1680-7324 https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58 Atmospheric Chemistry and Physics, Vol 23, Pp 15365-15373 (2023) Physics QC1-999 Chemistry QD1-999 article 2023 ftdoajarticles https://doi.org/10.5194/acp-23-15365-2023 2023-12-17T01:37:40Z In this study, we analyze the transition of a stable atmospheric boundary layer (ABL) with a low-level jet (LLJ) to a traditional stable ABL with a classic Ekman helix in the late-winter central Arctic. Vertical profiles in the ABL were measured with a hot-wire anemometer on a tethered balloon during a 15 h period in March 2018 in northeast Greenland. The tethered balloon allows high-resolution turbulence observations from the ground to the top of the ABL. The core of the LLJ was observed at about 150 m altitude, and its height and strength were associated with the temperature inversion. Increased turbulence was observed in the vicinity of the LLJ, but most of the turbulence does not reach down to the surface, thus decoupling the LLJ from the surface. Only when the LLJ collapses and the ABL again exhibits a more classical Ekman spiral is a coupling to the surface re-established. The LLJ might enhance both advective and turbulent vertical transport of passive tracers such as aerosol particles or moisture in the often stably stratified Arctic ABL. Article in Journal/Newspaper Arctic Greenland Directory of Open Access Journals: DOAJ Articles Arctic Greenland Atmospheric Chemistry and Physics 23 24 15365 15373 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 U. Egerer H. Siebert O. Hellmuth L. L. Sørensen The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
In this study, we analyze the transition of a stable atmospheric boundary layer (ABL) with a low-level jet (LLJ) to a traditional stable ABL with a classic Ekman helix in the late-winter central Arctic. Vertical profiles in the ABL were measured with a hot-wire anemometer on a tethered balloon during a 15 h period in March 2018 in northeast Greenland. The tethered balloon allows high-resolution turbulence observations from the ground to the top of the ABL. The core of the LLJ was observed at about 150 m altitude, and its height and strength were associated with the temperature inversion. Increased turbulence was observed in the vicinity of the LLJ, but most of the turbulence does not reach down to the surface, thus decoupling the LLJ from the surface. Only when the LLJ collapses and the ABL again exhibits a more classical Ekman spiral is a coupling to the surface re-established. The LLJ might enhance both advective and turbulent vertical transport of passive tracers such as aerosol particles or moisture in the often stably stratified Arctic ABL. |
format |
Article in Journal/Newspaper |
author |
U. Egerer H. Siebert O. Hellmuth L. L. Sørensen |
author_facet |
U. Egerer H. Siebert O. Hellmuth L. L. Sørensen |
author_sort |
U. Egerer |
title |
The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
title_short |
The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
title_full |
The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
title_fullStr |
The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
title_full_unstemmed |
The role of a low-level jet for stirring the stable atmospheric surface layer in the Arctic |
title_sort |
role of a low-level jet for stirring the stable atmospheric surface layer in the arctic |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-15365-2023 https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland |
genre_facet |
Arctic Greenland |
op_source |
Atmospheric Chemistry and Physics, Vol 23, Pp 15365-15373 (2023) |
op_relation |
https://acp.copernicus.org/articles/23/15365/2023/acp-23-15365-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-15365-2023 1680-7316 1680-7324 https://doaj.org/article/9baf71a381864c1cb3e4d58f3e445c58 |
op_doi |
https://doi.org/10.5194/acp-23-15365-2023 |
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Atmospheric Chemistry and Physics |
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23 |
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24 |
container_start_page |
15365 |
op_container_end_page |
15373 |
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