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

Irannezhad, M.; Haghighi, A. T.; Chen, Deliang and Kløve, B. (2014) In Theoretical and Applied Climatology Epub ahead of print.
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... (More)
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. (Less)
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Contribution to journal
publication status
published
subject
in
Theoretical and Applied Climatology
volume
Epub ahead of print
publisher
Springer
external identifiers
  • scopus:84944281240
ISSN
1434-4483
DOI
10.1007/s00704-014-1305-x
project
MERGE
language
English
LU publication?
no
id
eb8b0676-8797-45b3-90d6-7c9a20be930d (old id 7515392)
date added to LUP
2015-07-08 14:50:44
date last changed
2017-09-24 04:42:46
@article{eb8b0676-8797-45b3-90d6-7c9a20be930d,
  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.},
  author       = {Irannezhad, M. and Haghighi, A. T. and Chen, Deliang and Kløve, B.},
  issn         = {1434-4483},
  language     = {eng},
  publisher    = {Springer},
  series       = {Theoretical and Applied Climatology},
  title        = {Variability in Dryness and Wetness in Central Finland and the Role of Teleconnection Patterns},
  url          = {http://dx.doi.org/10.1007/s00704-014-1305-x},
  volume       = {Epub ahead of print},
  year         = {2014},
}