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Variability in Dryness and Wetness in Central Finland and the Role of Teleconnection Patterns

Journal article
Authors M. Irannezhad
A. T. Haghighi
Deliang Chen
B. Kløve
Published in Journal of Theoretical and Applied Climatology
Volume 122
Issue 3-4
Pages 471-486
ISSN 0177-798X
Publication year 2015
Published at Department of Earth Sciences
Pages 471-486
Language en
Links dx.doi.org/10.1007/s00704-014-1305-...
Subject categories Earth and Related Environmental Sciences

Abstract

Interannual variability in meteorological dryness and wetness in central Finland during the period 1959–2009 was analysed using Standardized Precipitation Index (SPI) on three timescales (annual, seasonal and monthly). For different time steps (12, 3 and 1 months) of SPI values (SPI12, SPI3 and SPI1), trends based on the Mann-Kendall non-parametric test and the most significant relationships with a number of climate teleconnection patterns based on Spearman correlation coefficient (rho) were determined. Analysis of the SPI values on different timescales showed a general decreasing trend in dryness and an increasing trend in wetness; only August showed an increasing trend in dryness. The longest wet period observed was 5 years (between 1988 and 1992), while the longest dry period was 4 years (in the mid-1960s). Wet conditions were more frequent than dry conditions and mainly occurred at extreme or moderate level. Typically, the extremely wet level was more frequent than the extremely dry level. The dry and wet conditions were negatively correlated with the East Atlantic/West Russia and Scandinavia teleconnection patterns and positively correlated with the North Atlantic Oscillation.

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