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- | ====== Publications ====== | ||
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- | //Citation: Noer G, Saetra Ø, Lien T, Gusdal Y. 2011. A climatological study of polar lows in the Nordic Seas. | ||
- | Q. J. R. Meteorol. Soc. DOI: | ||
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- | **Abstract: | ||
- | infrared satellite images for the period between 2000 and 2009. The same region was | ||
- | studied in the 1980s using traditional weather charts for the period between 1972 | ||
- | and 1982. One motivation for the present study was to revisit this climatology, | ||
- | using a different decade and taking advantage of the vastly improved coverage and | ||
- | dissemination of infrared satellite images since the 1980s. The fact that forecasters | ||
- | at the Norwegian Meteorological Institute had introduced a routine to register | ||
- | polar-low events systematically from 2000 and onward also provided a unique | ||
- | opportunity for extending the existing repository of subjectively identified polar- | ||
- | low observations. On average we found 12 polar-low events per year in the region | ||
- | of study. This is more than the earlier investigation, | ||
- | be explained by the fact that the previous study relied almost uniquely on weather | ||
- | charts with very little information from ocean areas in the Nordic Seas. The largest | ||
- | numbers were found in January with an average of 2.8 polar-low events per year. | ||
- | The study reconfirms the February minimum found in previous studies, but on the | ||
- | basis of our data we could not show that this minimum is statistically significant. | ||
- | It is suggested that this may be explained as a manifestation of the coldest winter | ||
- | month, when a surface-pressure high over the Scandinavian mainland is common | ||
- | and the large-scale atmospheric flow is less favourable to polar-low formation. This | ||
- | hypothesis was tested by calculating the mean sea-level pressure (MSLP) anomaly | ||
- | for January, February and March from an atmospheric reanalysis. This revealed a | ||
- | positive anomaly over Scandinavia and northwest Russia not found in the pressure | ||
- | distributions for January and March. | ||