Low-level jet characteristics over the Arctic Ocean in spring and summer
Low-level jets (LLJ) are important for turbulence in the stably stratified atmospheric boundary layer, but their occurrence, properties, and generation mechanisms in the Arctic are not well known. We analysed LLJs over the central Arctic Ocean in spring and summer 2007 on the basis of data collected...
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ftdoajarticles:oai:doaj.org/article:687f9efe2cb44549897cdac9280ea99a 2023-05-15T14:51:06+02:00 Low-level jet characteristics over the Arctic Ocean in spring and summer L. Jakobson T. Vihma E. Jakobson T. Palo A. Männik J. Jaagus 2013-11-01T00:00:00Z https://doi.org/10.5194/acp-13-11089-2013 https://doaj.org/article/687f9efe2cb44549897cdac9280ea99a EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/11089/2013/acp-13-11089-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-13-11089-2013 https://doaj.org/article/687f9efe2cb44549897cdac9280ea99a Atmospheric Chemistry and Physics, Vol 13, Iss 21, Pp 11089-11099 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-11089-2013 2022-12-30T21:20:54Z Low-level jets (LLJ) are important for turbulence in the stably stratified atmospheric boundary layer, but their occurrence, properties, and generation mechanisms in the Arctic are not well known. We analysed LLJs over the central Arctic Ocean in spring and summer 2007 on the basis of data collected in the drifting ice station Tara. Instead of traditional radiosonde soundings, data from tethersonde soundings with a high vertical resolution were used. The Tara results showed a lower occurrence of LLJs (46 ± 8%) than many previous studies over polar sea ice. Strong jet core winds contributed to growth of the turbulent layer. Complex relationships between the jet core height and the temperature inversion top height were detected: substantial correlation ( r = 0.72; p < 0.01) occurred when the jet core was above the turbulent layer, but when inside the turbulent layer there was no correlation. The most important forcing mechanism for LLJs was baroclinicity, which was responsible for the generation of strong and warm LLJs, which on average occurred at lower altitudes than other jets. Baroclinic jets were mostly associated with transient cyclones instead of the climatological air temperature gradients. Besides baroclinicity, cases related to inertial oscillations and gusts were detected. As many as 49% of the LLJs observed were associated with a frontal passage, which provides favourable conditions for baroclinicity, inertial oscillations, and gusts. Further research needs on LLJs in the Arctic include investigation of low-level jet streams and their effects on the sea ice drift and atmospheric moisture transport. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Atmospheric Chemistry and Physics 13 21 11089 11099 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 L. Jakobson T. Vihma E. Jakobson T. Palo A. Männik J. Jaagus Low-level jet characteristics over the Arctic Ocean in spring and summer |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Low-level jets (LLJ) are important for turbulence in the stably stratified atmospheric boundary layer, but their occurrence, properties, and generation mechanisms in the Arctic are not well known. We analysed LLJs over the central Arctic Ocean in spring and summer 2007 on the basis of data collected in the drifting ice station Tara. Instead of traditional radiosonde soundings, data from tethersonde soundings with a high vertical resolution were used. The Tara results showed a lower occurrence of LLJs (46 ± 8%) than many previous studies over polar sea ice. Strong jet core winds contributed to growth of the turbulent layer. Complex relationships between the jet core height and the temperature inversion top height were detected: substantial correlation ( r = 0.72; p < 0.01) occurred when the jet core was above the turbulent layer, but when inside the turbulent layer there was no correlation. The most important forcing mechanism for LLJs was baroclinicity, which was responsible for the generation of strong and warm LLJs, which on average occurred at lower altitudes than other jets. Baroclinic jets were mostly associated with transient cyclones instead of the climatological air temperature gradients. Besides baroclinicity, cases related to inertial oscillations and gusts were detected. As many as 49% of the LLJs observed were associated with a frontal passage, which provides favourable conditions for baroclinicity, inertial oscillations, and gusts. Further research needs on LLJs in the Arctic include investigation of low-level jet streams and their effects on the sea ice drift and atmospheric moisture transport. |
format |
Article in Journal/Newspaper |
author |
L. Jakobson T. Vihma E. Jakobson T. Palo A. Männik J. Jaagus |
author_facet |
L. Jakobson T. Vihma E. Jakobson T. Palo A. Männik J. Jaagus |
author_sort |
L. Jakobson |
title |
Low-level jet characteristics over the Arctic Ocean in spring and summer |
title_short |
Low-level jet characteristics over the Arctic Ocean in spring and summer |
title_full |
Low-level jet characteristics over the Arctic Ocean in spring and summer |
title_fullStr |
Low-level jet characteristics over the Arctic Ocean in spring and summer |
title_full_unstemmed |
Low-level jet characteristics over the Arctic Ocean in spring and summer |
title_sort |
low-level jet characteristics over the arctic ocean in spring and summer |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-11089-2013 https://doaj.org/article/687f9efe2cb44549897cdac9280ea99a |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 21, Pp 11089-11099 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/11089/2013/acp-13-11089-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-13-11089-2013 https://doaj.org/article/687f9efe2cb44549897cdac9280ea99a |
op_doi |
https://doi.org/10.5194/acp-13-11089-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
21 |
container_start_page |
11089 |
op_container_end_page |
11099 |
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1766322167626072064 |