Wintertime Arctic Oscillation and Formation of River Spring Floods in the Barents Sea Basinстатья
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Дата последнего поиска статьи во внешних источниках: 23 августа 2019 г.
Аннотация:Results from the research on the influence of the wintertime Arctic Oscillation (AO) on the spring floods of the North European Russia rivers of Onega, Northern Dvina, Mezen’, and Pechora flowing into the White and Barents seas are presented in the paper. Composites of the river water discharges from 1930 – 2014 constructed in accordance with the wintertime AO index above the upper and below the lower quartiles are analyzed. Statistically significant relationships between the dates and intensity of the river spring floods in the Barents Sea basin and the wintertime AO are shown. For all the analyzed rivers, April water runoff preceded by the winters of the AO positive phase significantly increases and more than twice exceeds that preceded by the winters of the AO negative phase. For the Mezen’ and Pechora rivers significant runoff increase extends into May, with the May runoff of the easternmost Pechora river becoming comparable with the June runoff peak. It is shown that the earlier and more intensive floods are caused by the earlier spring warming after the winters of positive AO phase and larger snow accumulation during these winters as compared to the winters of the negative AO phase. After the winters of the positive AO phase annual mean runoff of the Mezen’ and Pechora rivers statistically significantly exceeds that after the winters of the negative AO phase which is due to essential positive anomaly of the snow accumulation during the winters of the positive AO phase.
Key words: Arctic oscillation, spring flood, river discharge, water runoff, Barents Sea basin, statistical analysis