Articles | Volume 20, issue 8
https://doi.org/10.5194/tc-20-4701-2026
https://doi.org/10.5194/tc-20-4701-2026
Research article
 | 
25 Aug 2026
Research article |  | 25 Aug 2026

Asymmetric shifts in seasonal transition timing in a sub-Arctic river system under climate warming

Abolfazl Jalali Shahrood, Amirhossein Ahrari, and Ali Torabi Haghighi

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Short summary
We studied 59 years of daily river flow, snow depth, and air temperature for a sub-Arctic river in Finland to see how the timing of seasonal change has shifted. Spring events now arrive earlier and together, while autumn events stay irregular and lag behind. The cold season is shrinking from both ends, and the atmosphere is increasingly running ahead of the snow and water response. The amounts of water and snow, however, have not changed, only their timing.
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