Importance of regional indices of atmospheric circulation for periods of warming and cooling in Svalbard during 1920–2018

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dc.contributor.author Łupikasza, Ewa
dc.contributor.author Niedźwiedź, Tadeusz
dc.contributor.author Przybylak, Rajmund
dc.contributor.author Nordli, Øyvind
dc.date.accessioned 2021-04-21T09:44:18Z
dc.date.available 2021-04-21T09:44:18Z
dc.date.issued 2021
dc.identifier.citation International Journal of Climatology vol.41, 2021, pp. 3481– 3502.
dc.identifier.other https://doi.org/10.1002/joc.7031
dc.identifier.uri http://repozytorium.umk.pl/handle/item/6558
dc.description.abstract The Arctic has experienced prominent climate warming, at the beginning of the 20th century and currently. Comparing the driving mechanism during these periods helps to explain the causes of contemporary climate change. Our study explores the impact of regional circulation on Svalbard's surface air temperature (SAT, 2 m above ground). We used air temperature data from Svalbard Airport, Bjørnøya stations, and three regional circulation indices that describe the frequency of cyclonic conditions, zonal circulation, and meridional circulation. The indices were calculated for four circulation areas with differing circulation conditions and, therefore, may have various impacts on long‐term changes in SAT. This was checked for the entire study period (1920–2018), and 30‐year sub‐periods representing the most prominent climatic events: the early 20th‐century Arctic warming (ETCAW), contemporary Arctic warming (CAW), and a cold period between them (CAP). In autumn and winter, the deviations in SAT from the long‐term average during warm and cold periods were almost twice as large at Svalbard Airport as at Bjørnøya. In these seasons, the ETCAW was significantly warmer than the subsequent cold period, which was not the case for summer and spring. However, long‐term trends in the regional circulation indices were more evident in summer and spring than in autumn and winter. Air temperature was the most strongly influenced by meridional circulation over the eastern circulation areas, with the exception of spring, when air temperature variability was more affected by zonal circulation. The recent warming weakened the relationship between SAT and the indices in summer. We attributed the ETCAW in autumn to a southerly advection of sensible heat. During the same historical period, the impact of the indices was much weaker in winter. In winter during the CAP, there was a higher frequency of northern air advection, particularly over the northern part of the Greenland Sea.
dc.description.sponsorship National Science Centre, Poland, Grant/Award Number: 2015/19/B/ST10/02933 The study of Rajmund Przybylak was also carried out as a part of the Research University – Initiative of Excellence: the Emerging Field “Global Environmental Changes”, and "Climate Change Research Unit" at Nicolaus Copernicus University in Toruń.
dc.language.iso eng
dc.publisher Royal Meteorological Society
dc.relation.ispartofseries International Journal of Climatology;2021; 41: 3481– 3502
dc.subject air temperature
dc.subject atmospheric circulation
dc.subject climate change
dc.subject contemporary warming
dc.subject ETCW
dc.subject Svalbard
dc.title Importance of regional indices of atmospheric circulation for periods of warming and cooling in Svalbard during 1920–2018
dc.type info:eu-repo/semantics/article

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