A climatology of wintertime low-level jets in Nares Strait
Intense, southward low-level winds are common in Nares Strait, between Ellesmere Island and northern Greenland. The steep topography along Nares Strait leads to channelling effects, resulting in an along-strait flow. This research study presents a 30-year climatology of the flow regime from simulati...
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Norwegian Polar Institute
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/53036/ https://oceanrep.geomar.de/id/eprint/53036/1/Kohnemann.pdf https://doi.org/10.33265/polar.v40.3622 |
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ftoceanrep:oai:oceanrep.geomar.de:53036 2023-05-15T16:05:57+02:00 A climatology of wintertime low-level jets in Nares Strait Kohnemann, Svenja H.E. Heinemann, Günther 2021-04-19 text https://oceanrep.geomar.de/id/eprint/53036/ https://oceanrep.geomar.de/id/eprint/53036/1/Kohnemann.pdf https://doi.org/10.33265/polar.v40.3622 en eng Norwegian Polar Institute https://oceanrep.geomar.de/id/eprint/53036/1/Kohnemann.pdf Kohnemann, S. H. E. and Heinemann, G. (2021) A climatology of wintertime low-level jets in Nares Strait. Open Access Polar Research, 40 . Art.Nr. 3622. DOI 10.33265/polar.v40.3622 <https://doi.org/10.33265/polar.v40.3622>. doi:10.33265/polar.v40.3622 cc_by_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.33265/polar.v40.3622 2023-04-07T15:56:55Z Intense, southward low-level winds are common in Nares Strait, between Ellesmere Island and northern Greenland. The steep topography along Nares Strait leads to channelling effects, resulting in an along-strait flow. This research study presents a 30-year climatology of the flow regime from simulations of the COSMO-CLM climate model. The simulations are available for the winter periods (November–April) 1987/88 to 2016/17, and thus, cover a period long enough to give robust long-term characteristics of Nares Strait. The horizontal resolution of 15 km is high enough to represent the complex terrain and the meteorological conditions realistically. The 30-year climatology shows that LLJs associated with gap flows are a climatological feature of Nares Strait. The maximum of the mean 10-m wind speed is around 12 m s-1 and is located at the southern exit of Smith Sound. The wind speed is strongly related to the pressure gradient. Single events reach wind speeds of 40 m s-1 in the daily mean. The LLJs are associated with gap flows within the narrowest parts of the strait under stably stratified conditions, with the main LLJ occurring at 100–250 m height. With increasing mountain Froude number, the LLJ wind speed and height increase. The frequency of strong wind events (>20 m s-1 in the daily mean) for the 10 m wind shows a strong interannual variability with an average of 15 events per winter. Channelled winds have a strong impact on the formation of the North Water polynya. Article in Journal/Newspaper Ellesmere Island Greenland Nares strait Polar Research Smith sound OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Ellesmere Island Greenland Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Smith Sound ENVELOPE(-73.996,-73.996,78.419,78.419) Polar Research 40 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Intense, southward low-level winds are common in Nares Strait, between Ellesmere Island and northern Greenland. The steep topography along Nares Strait leads to channelling effects, resulting in an along-strait flow. This research study presents a 30-year climatology of the flow regime from simulations of the COSMO-CLM climate model. The simulations are available for the winter periods (November–April) 1987/88 to 2016/17, and thus, cover a period long enough to give robust long-term characteristics of Nares Strait. The horizontal resolution of 15 km is high enough to represent the complex terrain and the meteorological conditions realistically. The 30-year climatology shows that LLJs associated with gap flows are a climatological feature of Nares Strait. The maximum of the mean 10-m wind speed is around 12 m s-1 and is located at the southern exit of Smith Sound. The wind speed is strongly related to the pressure gradient. Single events reach wind speeds of 40 m s-1 in the daily mean. The LLJs are associated with gap flows within the narrowest parts of the strait under stably stratified conditions, with the main LLJ occurring at 100–250 m height. With increasing mountain Froude number, the LLJ wind speed and height increase. The frequency of strong wind events (>20 m s-1 in the daily mean) for the 10 m wind shows a strong interannual variability with an average of 15 events per winter. Channelled winds have a strong impact on the formation of the North Water polynya. |
format |
Article in Journal/Newspaper |
author |
Kohnemann, Svenja H.E. Heinemann, Günther |
spellingShingle |
Kohnemann, Svenja H.E. Heinemann, Günther A climatology of wintertime low-level jets in Nares Strait |
author_facet |
Kohnemann, Svenja H.E. Heinemann, Günther |
author_sort |
Kohnemann, Svenja H.E. |
title |
A climatology of wintertime low-level jets in Nares Strait |
title_short |
A climatology of wintertime low-level jets in Nares Strait |
title_full |
A climatology of wintertime low-level jets in Nares Strait |
title_fullStr |
A climatology of wintertime low-level jets in Nares Strait |
title_full_unstemmed |
A climatology of wintertime low-level jets in Nares Strait |
title_sort |
climatology of wintertime low-level jets in nares strait |
publisher |
Norwegian Polar Institute |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/53036/ https://oceanrep.geomar.de/id/eprint/53036/1/Kohnemann.pdf https://doi.org/10.33265/polar.v40.3622 |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-73.996,-73.996,78.419,78.419) |
geographic |
Ellesmere Island Greenland Nares Smith Sound |
geographic_facet |
Ellesmere Island Greenland Nares Smith Sound |
genre |
Ellesmere Island Greenland Nares strait Polar Research Smith sound |
genre_facet |
Ellesmere Island Greenland Nares strait Polar Research Smith sound |
op_relation |
https://oceanrep.geomar.de/id/eprint/53036/1/Kohnemann.pdf Kohnemann, S. H. E. and Heinemann, G. (2021) A climatology of wintertime low-level jets in Nares Strait. Open Access Polar Research, 40 . Art.Nr. 3622. DOI 10.33265/polar.v40.3622 <https://doi.org/10.33265/polar.v40.3622>. doi:10.33265/polar.v40.3622 |
op_rights |
cc_by_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.33265/polar.v40.3622 |
container_title |
Polar Research |
container_volume |
40 |
_version_ |
1766401866858496000 |