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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 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.
Author: | Svenja Kohnemann, Günther Heinemann |
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URN: | urn:nbn:de:hbz:385-1-18227 |
DOI: | https://doi.org/10.33265/polar.v40.3622 |
Parent Title (English): | Polar Research |
Publisher: | Norwegian Polar Institute |
Place of publication: | Tromsø |
Document Type: | Article |
Language: | English |
Date of completion: | 2021/04/19 |
Date of publication: | 2021/04/19 |
Publishing institution: | Universität Trier |
Contributing corporation: | The publication was funded by the Open Access Fund of Universität Trier and the German Research Foundation (DFG) |
Release Date: | 2022/03/15 |
Tag: | Arctic; Greenland; North Water Polynya; atmospheric modelling; gap flow |
GND Keyword: | Atmosphärische Grenzschicht; Modellierung; Nares-Straße; Polynja; Strahlstrom |
Volume (for the year ...): | 2021 |
Issue / no.: | Band 40 |
Number of pages: | 16 |
Institutes: | Fachbereich 6 / Raum- und Umweltwissenschaften |
Dewey Decimal Classification: | 9 Geschichte und Geografie / 91 Geografie, Reisen / 910 Geografie, Reisen |
Licence (German): | CC BY: Creative-Commons-Lizenz 4.0 International |