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dc.contributor.authorStoll, Johannes Patrick
dc.date.accessioned2023-01-17T11:43:39Z
dc.date.available2023-01-17T11:43:39Z
dc.date.issued2022-04-11
dc.description.abstractPolar lows are intense mesoscale cyclones developing in marine polar air masses. This study presents a new global climatology of polar lows based on the ERA5 reanalysis for the years 1979–2020. Criteria for the detection of polar lows are derived based on a comparison of five polarlow archives with cyclones derived by a mesoscale tracking algorithm. The characteristics associated with polar lows are considered by the following criteria: (i) intense cyclone (large relative vorticity), (ii) mesoscale (small vortex diameter), and (iii) development in the marine polar air masses (a combination of low potential static stability and low potential temperature at the tropopause). Polar lows develop in all marine areas adjacent to sea ice or cold landmasses, mainly in the winter half year. The length and intensity of the season are regionally dependent. The highest density appears in the Nordic Seas. For all ocean sub-basins, forward-shear polar lows are the most common, whereas weak-shear polar lows and those propagating towards warmer environments are second and third most frequent, depending on the area. Reverse-shear polar lows and those propagating towards colder environments are rather seldom, especially in the Southern Ocean. Generally, polar lows share many characteristics across ocean basins and wind-shear categories. The most remarkable difference is that forward-shear polar lows often occur in a stronger vertical wind shear, whereas reverse-shear polar lows feature lower static stability. Hence, the contribution to a fast baroclinic growth rate is slightly different for the shear categories.en_US
dc.identifier.citationStoll. A global climatology of polar lows investigated for local differences and wind-shear environments. Weather and Climate Dynamics (WCD). 2022en_US
dc.identifier.cristinIDFRIDAID 2093166
dc.identifier.doi10.5194/wcd-3-483-2022
dc.identifier.issn2698-4016
dc.identifier.urihttps://hdl.handle.net/10037/28276
dc.language.isoengen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.journalWeather and Climate Dynamics (WCD)
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleA global climatology of polar lows investigated for local differences and wind-shear environmentsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)