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Century-long variability and trends in daily precipitation characteristics at three Finnish stations

Journal article
Authors Masoud Irannezhad
Hannu Marttila
Deliang Chen
Bjørn Kløve
Published in Advances in Climate Change Research
Volume 7
Pages 54-69
ISSN 1674-9278
Publication year 2016
Published at Department of Earth Sciences
Pages 54-69
Language en
Links doi.org/10.1016/j.accre.2016.04.004
Keywords Atmospheric circulation patterns, Daily precipitation characteristics, Duration, Extremes, Finland, Frequency, Intensity, Trend analysis
Subject categories Climate Research

Abstract

© 2016 National Climate Center (China Meteorological Administration) Long-term variations and trends in a wide range of statistics for daily precipitation characteristics in terms of intensity, frequency and duration in Finland were analysed using precipitation records during 1908–2008 from 3 meteorological stations in the south (Kaisaniemi), centre (Kajaani) and north (Sodankylä). Although precipitation days in northern part were more frequent than in central and southern parts, daily precipitation intensity in the south was generally higher than those in the centre and north of the country. Annual sum of very light precipitation (0 mm < daily precipitation ≤ long-term 50th percentile of daily precipitation more than 0 mm) significantly (p < 0.05) decreased over time, with the highest rate in northern Finland. These decreasing trends might be the result of significant increases in frequency of days with very light precipitation at all the stations, with the highest and lowest rates in northern and southern Finland, respectively. Ratio of annual total precipitation to number of precipitation days also declined in Finland over 1908–2008, with a decreasing north to south gradient. However, annual duration indices of daily precipitation revealed no statistically significant trends at any station. Daily precipitation characteristics showed significant relationships with various well-known atmospheric circulation patterns (ACPs). In particular, the East Atlantic/West Russia (EA/WR) pattern in summer was the most influential ACP negatively associated with different daily precipitation intensity, frequency and duration indices at all three stations studied.

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