A1 Refereed original research article in a scientific journal
Long-Term Climate Trends and Extreme Events in Northern Fennoscandia (1914-2013)
Authors: Kivinen Sonja, Rasmus Sirpa, Jylhä Kirsti, Laapas Mikko
Publisher: MDPI AG
Publication year: 2017
Journal:: Climate
Journal name in source: CLIMATE
Journal acronym: CLIMATE
Article number: ARTN 16
Volume: 5
Issue: 1
Number of pages: 17
ISSN: 2225-1154
eISSN: 2225-1154
DOI: https://doi.org/10.3390/cli5010016
Web address : http://www.mdpi.com/2225-1154/5/1/16/htm
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/20522015
We studied climate trends and the occurrence of rare and extreme temperature and precipitation events in northern Fennoscandia in 1914-2013. Weather data were derived from nine observation stations located in Finland, Norway, Sweden and Russia. The results showed that spring and autumn temperatures and to a lesser extent summer temperatures increased significantly in the study region, the observed changes being the greatest for daily minimum temperatures. The number of frost days declined both in spring and autumn. Rarely cold winter, spring, summer and autumn seasons had a low occurrence and rarely warm spring and autumn seasons a high occurrence during the last 20-year interval (1994-2013), compared to the other 20-year intervals. That period was also characterized by a low number of days with extremely low temperature in all seasons (4%-9% of all extremely cold days) and a high number of April and October days with extremely high temperature (36%-42% of all extremely warm days). A tendency of exceptionally high daily precipitation sums to grow even higher towards the end of the study period was also observed. To summarize, the results indicate a shortening of the cold season in northern Fennoscandia. Furthermore, the results suggest significant declines in extremely cold climate events in all seasons and increases in extremely warm climate events particularly in spring and autumn seasons.
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