A climatology of wintertime low-level jets in Nares Strait.

Kohnemann, Svenja H.E. and Heinemann, Günther (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.

[thumbnail of Kohnemann.pdf]
Kohnemann.pdf - Published Version
Available under License Creative Commons: Attribution-No Derivative Works 4.0.

Download (7MB) | Preview

Supplementary data:


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.

Document Type: Article
Keywords: Arctic, gap flow, atmospheric modelling, Greenland, North Water Polynya, wind
Refereed: Yes
Open Access Journal?: Yes
Publisher: Norwegian Polar Institute
Projects: CATS
Date Deposited: 30 Jun 2021 13:41
Last Modified: 04 Jan 2023 11:35
URI: https://oceanrep.geomar.de/id/eprint/53036

Actions (login required)

View Item View Item