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dc.contributor.authorStoll, Patrick
dc.contributor.authorGraversen, Rune
dc.contributor.authorNoer, Gunnar
dc.contributor.authorHodges, Kevin
dc.date.accessioned2018-08-13T12:58:07Z
dc.date.available2018-08-13T12:58:07Z
dc.date.issued2018-04-16
dc.description.abstractHere we present an objective global climatology of polar lows. In order to obtain objective detection criteria, the efficacy of several parameters for separating polar lows from other cyclones has been compared. The comparison and the climatology are based on the ERA‐Interim reanalysis from 1979 ‐ 2016 and the high‐resolution Arctic System Reanalysis from 2000 ‐ 2012. The most effective parameters in separating polar lows from other extra‐tropical cyclones were found to be the difference between the sea‐level pressure at the centre of the low and its surroundings, the difference in the potential temperature between the sea surface and the 500 hPa level, and the tropopause wind speed poleward of the system. Other parameters often used to identify polar lows, such as the 10 m wind speed and the temperature difference between the sea surface and the 700 hPa level, were found to be less effective. The climatologies reveal that polar lows occur in all marine basins at high latitudes, but with high occurrence density in the vicinity of the sea‐ice edge and coastal zones. The regions showing the highest degree of polar‐low activity are the Denmark Strait and the Nordic Seas, especially for the most intense polar lows. In the North Atlantic and Pacific, the main polar‐low season ranges from November to March. In the Southern Hemisphere, polar lows are mainly detected between 50 ‐ 65 S from April to October, indicating that this hemisphere compared to its northern counterpart has a two months longer, but less intense, polar‐low season. No significant hemispheric long‐term trends are observed, although some regions, such as the Denmark Strait and the Nordic Seas, experience significant downward and upward trends in polar lows, respectively, over the last decades. For intense polar lows, a significant decaying trend has been observed for the Northern Hemisphere.en_US
dc.descriptionThis is the pre-peer reviewed version of the following article: Stoll, P., Graversen, R., Noer, G. & Hodges, K. (2018). An objective global climatology of polar lows based on reanalysis data. Quarterly Journal of the Royal Meteorological Society. https://doi.org/10.1002/qj.3309, which has been published in final form at <a href=https://doi.org/10.1002/qj.3309> https://doi.org/10.1002/qj.3309</a>. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.en_US
dc.identifier.citationStoll, P., Graversen, R., Noer, G. & Hodges, K. (2018). An objective global climatology of polar lows based on reanalysis data. Quarterly Journal of the Royal Meteorological Society. https://doi.org/10.1002/qj.3309en_US
dc.identifier.cristinIDFRIDAID 1599461
dc.identifier.issn0035-9009
dc.identifier.issn1477-870X
dc.identifier.urihttps://hdl.handle.net/10037/13386
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalQuarterly Journal of the Royal Meteorological Society
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453en_US
dc.subjectmesoscale cycloneen_US
dc.subjectArctic hurricaneen_US
dc.subjectmarine cold‐air outbreaken_US
dc.subjectdetection/ identification criteriaen_US
dc.subjecttracking algorithmen_US
dc.subjectlong‐term trenden_US
dc.titleAn objective global climatology of polar lows based on reanalysis dataen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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