Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Long-term variability and trends in annual snowfall/total precipitation ratio in Finland and the role of atmospheric circulation patterns
AbstractThis study evaluated variabilities and trends in annual snowfall to total precipitation (S/P) ratio at Sodankylä, Kajaani and Kaisaniemi weather stations in northern, central and southern Finland during 1909–2008. Annual S/P ratio was estimated using daily precipitation and temperature records as input to a calibrated and validated temperature-index snowmelt model developed to simulate snowpack accumulation and melt processes in Finland. Factors controlling variations in annual S/P ratio and their relationships with large-scale atmospheric circulation patterns (ACPs) were also studied. The results show that there were significant declines in annual S/P ratio during 1909–2008, which were principally attributable to century-long decreasing trends in annual snowfall (S) in Finland. These reductions in annual S were predominantly controlled by both annual rainfall (R) and snowfall-day temperature (ST) in the south, annual ST in the centre, and annual R in the north. However, dividing the 100-year study period into an early (1909–1958) and late (1959–2008) periods revealed non-linear trend behaviours in annual S and consequently annual S/P ratio during 1909–2008. The Arctic Oscillation, East Atlantic, East Atlantic/West Russia and Scandinavia patterns were the most influential ACPs for annual S variability.
HighlightsAnnual snowfall to total precipitation (S/P) ratio declined in Finland in 1909–2008.Significant decreases in snowfall play the key role in declined annual S/P ratio.Both annual snowfall and S/P ratio showed non-linear trend behaviours in 1909–2008.AO, EA, EA/WR and SCA patterns affected snowfall in Finland during 1959–2008.
Long-term variability and trends in annual snowfall/total precipitation ratio in Finland and the role of atmospheric circulation patterns
AbstractThis study evaluated variabilities and trends in annual snowfall to total precipitation (S/P) ratio at Sodankylä, Kajaani and Kaisaniemi weather stations in northern, central and southern Finland during 1909–2008. Annual S/P ratio was estimated using daily precipitation and temperature records as input to a calibrated and validated temperature-index snowmelt model developed to simulate snowpack accumulation and melt processes in Finland. Factors controlling variations in annual S/P ratio and their relationships with large-scale atmospheric circulation patterns (ACPs) were also studied. The results show that there were significant declines in annual S/P ratio during 1909–2008, which were principally attributable to century-long decreasing trends in annual snowfall (S) in Finland. These reductions in annual S were predominantly controlled by both annual rainfall (R) and snowfall-day temperature (ST) in the south, annual ST in the centre, and annual R in the north. However, dividing the 100-year study period into an early (1909–1958) and late (1959–2008) periods revealed non-linear trend behaviours in annual S and consequently annual S/P ratio during 1909–2008. The Arctic Oscillation, East Atlantic, East Atlantic/West Russia and Scandinavia patterns were the most influential ACPs for annual S variability.
HighlightsAnnual snowfall to total precipitation (S/P) ratio declined in Finland in 1909–2008.Significant decreases in snowfall play the key role in declined annual S/P ratio.Both annual snowfall and S/P ratio showed non-linear trend behaviours in 1909–2008.AO, EA, EA/WR and SCA patterns affected snowfall in Finland during 1959–2008.
Long-term variability and trends in annual snowfall/total precipitation ratio in Finland and the role of atmospheric circulation patterns
Irannezhad, Masoud (Autor:in) / Ronkanen, Anna-Kaisa (Autor:in) / Kiani, Sepideh (Autor:in) / Chen, Deliang (Autor:in) / Kløve, Bjørn (Autor:in)
Cold Regions, Science and Technology ; 143 ; 23-31
21.08.2017
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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