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Evaluation of Long-term Discharge in Swedish Rivers

Lidén, Angelica LU and Persson, Karin LU (2012) VVR820 20112
Division of Water Resources Engineering
Abstract
Seasonal forecasting is not an easy task to deal with. A number of large scale atmospheric phenomena, e.g. Northern Atlantic Oscillation (NAO), Scandinavia (SCA) and Pacific Decadal Oscillation (PDO) affect the climate in Sweden and the effect on rivers is an integration of all the complex inter-relation among all these atmospheric phenomena.
In this Master thesis, the river discharge from 107 stations, distributed over Sweden, were examined in the search for decadal oscillation. River discharge measurement data, collected from the Swedish Meteorological and Hydrological Institute, span periods between 40 to 100 years. In order to examine these time series, the Wavelet analysis was used. The discharge stations were divided into groups,... (More)
Seasonal forecasting is not an easy task to deal with. A number of large scale atmospheric phenomena, e.g. Northern Atlantic Oscillation (NAO), Scandinavia (SCA) and Pacific Decadal Oscillation (PDO) affect the climate in Sweden and the effect on rivers is an integration of all the complex inter-relation among all these atmospheric phenomena.
In this Master thesis, the river discharge from 107 stations, distributed over Sweden, were examined in the search for decadal oscillation. River discharge measurement data, collected from the Swedish Meteorological and Hydrological Institute, span periods between 40 to 100 years. In order to examine these time series, the Wavelet analysis was used. The discharge stations were divided into groups, depending on location and wavelet spectrum and these groups were compared to the wavelets of the climate indices that represent the atmospheric phenomena.
Results show the presence of decadal oscillations in the river discharge in Sweden. It was also possible to make a rough grouping of stations with common features in their river discharge wavelet spectrum. Such groups followed roughly the climate zone distribution.
Possible connections to climate indices were found, of which Pacific Decadal Oscillation (PDO) and Pacific/North American (PNA) were the two most evident. One thing to note is that SCA was the climate index that was least connected to the discharge. Why river discharge tends to depend more on PDO and PNA than on SCA, when SCA is the Scandinavian affecting pattern, could be due to the vast amount of decadal and multidecadal oscillations that PDO and PNA have, which also many of the river discharge time series have. (Less)
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author
Lidén, Angelica LU and Persson, Karin LU
supervisor
organization
course
VVR820 20112
year
type
H2 - Master's Degree (Two Years)
subject
keywords
River Discharge Time Series, Sweden, Wavelet analysis, Northern Hemisphere Teleconnection Patterns and Decadal Oscillation.
report number
TVVR-12/5005
ISSN
1101-9824
language
English
id
2543470
date added to LUP
2012-06-04 11:31:26
date last changed
2012-06-04 11:31:26
@misc{2543470,
  abstract     = {Seasonal forecasting is not an easy task to deal with. A number of large scale atmospheric phenomena, e.g. Northern Atlantic Oscillation (NAO), Scandinavia (SCA) and Pacific Decadal Oscillation (PDO) affect the climate in Sweden and the effect on rivers is an integration of all the complex inter-relation among all these atmospheric phenomena. 
In this Master thesis, the river discharge from 107 stations, distributed over Sweden, were examined in the search for decadal oscillation. River discharge measurement data, collected from the Swedish Meteorological and Hydrological Institute, span periods between 40 to 100 years. In order to examine these time series, the Wavelet analysis was used. The discharge stations were divided into groups, depending on location and wavelet spectrum and these groups were compared to the wavelets of the climate indices that represent the atmospheric phenomena. 
Results show the presence of decadal oscillations in the river discharge in Sweden. It was also possible to make a rough grouping of stations with common features in their river discharge wavelet spectrum. Such groups followed roughly the climate zone distribution. 
Possible connections to climate indices were found, of which Pacific Decadal Oscillation (PDO) and Pacific/North American (PNA) were the two most evident. One thing to note is that SCA was the climate index that was least connected to the discharge. Why river discharge tends to depend more on PDO and PNA than on SCA, when SCA is the Scandinavian affecting pattern, could be due to the vast amount of decadal and multidecadal oscillations that PDO and PNA have, which also many of the river discharge time series have.},
  author       = {Lidén, Angelica and Persson, Karin},
  issn         = {1101-9824},
  keyword      = {River Discharge Time Series,Sweden,Wavelet analysis,Northern Hemisphere Teleconnection Patterns and Decadal Oscillation.},
  language     = {eng},
  note         = {Student Paper},
  title        = {Evaluation of Long-term Discharge in Swedish Rivers},
  year         = {2012},
}