caa a22 4500 605471339 CHVBK 20210128100332.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00382-014-2462-4 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2462-4 Kolstad Erik StormGeo, Bergen, Norway aut Extreme small-scale wind episodes over the Barents Sea: When, where and why? [Elektronische Daten] [Erik Kolstad] The Barents Sea is mostly ice-free during winter and therefore prone to severe weather associated with marine cold air outbreaks, such as polar lows. With the increasing marine activity in the region, it is important to study the climatology and variability of episodes with strong winds, as well as to understand their causes. Explosive marine cyclogenesis is usually caused by a combination of several mechanisms: upper-level forcing, stratospheric dry intrusions, latent heat release, surface energy fluxes, low-level baroclinicity. An additional factor that has been linked to extremely strong surface winds, is low static stability in the lower atmosphere, which allows for downward transfer of high-momentum air. Here the most extreme small-scale wind episodes in a high-resolution (5km) 35-year hindcast were analyzed, and it was found that they were associated with unusually strong low-level baroclinicity and surface heat fluxes. And crucially, the 12 most severe episodes had stronger cold-air advection than 12 slightly less severe cases, suggesting that marine cold air outbreaks are the most important mechanism for extreme winds on small spatial scales over the Barents Sea. Because weather models are often unable to explicitly forecast small-scale developments in data-sparse regions such as the Barents Sea, these results can be used by forecasters as supplements to forecast model data. Springer-Verlag Berlin Heidelberg, 2014 Polar lows nationallicence Numerical models nationallicence Extreme weather nationallicence Hindcasts nationallicence Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2137-2150 0930-7575 45:7-8<2137 2015 45 382 https://doi.org/10.1007/s00382-014-2462-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2462-4 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kolstad Erik StormGeo, Bergen, Norway aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2137-2150 0930-7575 45:7-8<2137 2015 45 382