University of Oulu

Masoud Irannezhad, Hamid Moradkhani, and Bjørn Kløve, “Spatiotemporal Variability and Trends in Extreme Temperature Events in Finland over the Recent Decades: Influence of Northern Hemisphere Teleconnection Patterns,” Advances in Meteorology, vol. 2018, Article ID 7169840, 17 pages, 2018.

Spatiotemporal variability and trends in extreme temperature events in Finland over the recent decades : influence of Northern Hemisphere teleconnection patterns

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Author: Irannezhad, Masoud1,2; Moradkhani, Hamid3; Kløve, Bjørn1
Organizations: 1Water Resources and Environmental Engineering Research Unit, Faculty of Technology, University of Oulu
2School of Environmental Science and Engineering, Southern University of Science and Technology
3Center for Complex Hydrosystems Research, Department of Civil, Construction and Environmental Engineering, University of Alabama
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 11.1 MB)
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Language: English
Published: Hindawi, 2018
Publish Date: 2018-10-08


Fifteen temperature indices recommended by the ETCCDI (Expert Team on Climate Change Detection and Indices) were applied to evaluate spatiotemporal variability and trends in annual intensity, frequency, and duration of extreme temperature statistics in Finland during 1961–2011. Statistically significant relationships between these high-resolution (10 km) temperature indices and seven influential Northern Hemisphere teleconnection patterns (NHTPs) for the interannual climate variability were also identified. During the study period (1961–2011), warming trends in extreme temperatures were generally manifested by statistically significant increases in cold temperature extremes rather than in the warm temperature extremes. As expected, warm days and nights became more frequent, while fewer cold days and nights occurred. The frequency of frost and icing days also decreased. Finland experienced more (less) frequent warm (cold) temperature extremes over the past few decades. Interestingly, significant lengthening in cold spells was observed over the upper part of northern Finland, while no clear changes are found in warm spells. Interannual variations in the temperature indices were significantly associated with a number of NHTPs. In general, warm temperature extremes show significant correlations with the East Atlantic and the Scandinavia patterns and cold temperature extremes with the Arctic Oscillation and the North Atlantic Oscillation patterns.

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Series: Advances in meteorology
ISSN: 1687-9309
ISSN-E: 1687-9317
ISSN-L: 1687-9309
Volume: 2018
Article number: 7169840
DOI: 10.1155/2018/7169840
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: The research presented in this paper was financially supported by Maa-Ja Vesitekniikan Tuki R.Y. and the Finnish Cultural Foundation.
Copyright information: Copyright © 2018 Masoud Irannezhad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.