Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland
The work concentrates on the dependency relations between the sunspot numbers, mean annual temperatures, annual precipitation rates, mean annual discharges (MQ), mean discharges of the flood months and coincident monthly mean temperatures and winter precipitation figures on the basis of general tre...
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Geographical Society of Finland
1983
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fttriple:oai:gotriple.eu:oai:doaj.org/article:312056b0f14241a8948a53a6123ef947 2023-05-15T17:42:50+02:00 Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland Leo Koutaniemi 1983-02-01 https://doaj.org/article/312056b0f14241a8948a53a6123ef947 en eng Geographical Society of Finland 1798-5617 https://doaj.org/article/312056b0f14241a8948a53a6123ef947 undefined Fennia: International Journal of Geography, Vol 161, Iss 2 (1983) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1983 fttriple 2023-01-22T19:07:21Z The work concentrates on the dependency relations between the sunspot numbers, mean annual temperatures, annual precipitation rates, mean annual discharges (MQ), mean discharges of the flood months and coincident monthly mean temperatures and winter precipitation figures on the basis of general trends, correlation coefficients and regression analysis results. All the dependency relations are examined using absolute values, and the first five also by reference to 5‑year moving means. With the exception of a few individual items, the information on the Oulujoki river basin reached as far back as 1896 and that on the Kemijoki river area to 1911. Attention was paid to the years before regulation of the flow of these rivers as well as to the whole observation period up to 1980 both when determining the correlation coefficients and in the regression analysis, where the discharge rates were the dependent variables and other factors, individually and in varying combinations the independent variables. Even though in the preliminary comparison the 11‑year sunspot maxima seemed almost regularly to follow an exceptionally low discharge and vice versa, sunspots could not explain more than approx. 10 % of the changes in terms of absolute values. The situation altered completely upon transformation of the data to moving means, the explanatory power reaching 38.3 % at best, while in the case of the other factors the opposite trend was observed in the corresponding situation. This was taken as evidence of the fact that changes in sunspot numbers are revealed in meteorological and hydrological changes more distinctly over periods of more than one year, whereas, from the negative correlation between sunspot numbers and precipitation rates, attention was directed to a possible relation between solar and cyclonic activity. The various combinations of factors chosen to explain the hydrological changes reached an explanatory power of approx. 50 % at most. Article in Journal/Newspaper Northern Finland Unknown Kemijoki ENVELOPE(24.500,24.500,65.783,65.783) |
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English |
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geo envir |
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geo envir Leo Koutaniemi Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
topic_facet |
geo envir |
description |
The work concentrates on the dependency relations between the sunspot numbers, mean annual temperatures, annual precipitation rates, mean annual discharges (MQ), mean discharges of the flood months and coincident monthly mean temperatures and winter precipitation figures on the basis of general trends, correlation coefficients and regression analysis results. All the dependency relations are examined using absolute values, and the first five also by reference to 5‑year moving means. With the exception of a few individual items, the information on the Oulujoki river basin reached as far back as 1896 and that on the Kemijoki river area to 1911. Attention was paid to the years before regulation of the flow of these rivers as well as to the whole observation period up to 1980 both when determining the correlation coefficients and in the regression analysis, where the discharge rates were the dependent variables and other factors, individually and in varying combinations the independent variables. Even though in the preliminary comparison the 11‑year sunspot maxima seemed almost regularly to follow an exceptionally low discharge and vice versa, sunspots could not explain more than approx. 10 % of the changes in terms of absolute values. The situation altered completely upon transformation of the data to moving means, the explanatory power reaching 38.3 % at best, while in the case of the other factors the opposite trend was observed in the corresponding situation. This was taken as evidence of the fact that changes in sunspot numbers are revealed in meteorological and hydrological changes more distinctly over periods of more than one year, whereas, from the negative correlation between sunspot numbers and precipitation rates, attention was directed to a possible relation between solar and cyclonic activity. The various combinations of factors chosen to explain the hydrological changes reached an explanatory power of approx. 50 % at most. |
format |
Article in Journal/Newspaper |
author |
Leo Koutaniemi |
author_facet |
Leo Koutaniemi |
author_sort |
Leo Koutaniemi |
title |
Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
title_short |
Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
title_full |
Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
title_fullStr |
Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
title_full_unstemmed |
Complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the Oulujoki and Kemijoki river basins, Northern Finland |
title_sort |
complexity of solar variability, hydrology and climatic conditions as evidenced in the case of the oulujoki and kemijoki river basins, northern finland |
publisher |
Geographical Society of Finland |
publishDate |
1983 |
url |
https://doaj.org/article/312056b0f14241a8948a53a6123ef947 |
long_lat |
ENVELOPE(24.500,24.500,65.783,65.783) |
geographic |
Kemijoki |
geographic_facet |
Kemijoki |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Fennia: International Journal of Geography, Vol 161, Iss 2 (1983) |
op_relation |
1798-5617 https://doaj.org/article/312056b0f14241a8948a53a6123ef947 |
op_rights |
undefined |
_version_ |
1766144764738011136 |