Articles | Volume 20, issue 8
https://doi.org/10.5194/tc-20-4701-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-20-4701-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Asymmetric shifts in seasonal transition timing in a sub-Arctic river system under climate warming
Abolfazl Jalali Shahrood
CORRESPONDING AUTHOR
Water, Energy and Environmental Engineering Research Unit, University of Oulu, Pentti Kaiterankatu 1, P.O. Box 8000, 90570, Oulu, Finland
independent researcher: Helsinki, 00790, Finland
Amirhossein Ahrari
Water, Energy and Environmental Engineering Research Unit, University of Oulu, Pentti Kaiterankatu 1, P.O. Box 8000, 90570, Oulu, Finland
Ali Torabi Haghighi
Water, Energy and Environmental Engineering Research Unit, University of Oulu, Pentti Kaiterankatu 1, P.O. Box 8000, 90570, Oulu, Finland
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This paper discusses the impact of citizen science and remote sensing on water quality monitoring. It explores applications combining citizen science with tools like microwave and optical systems, assessing parameters and techniques via apps such as EyeOnWater and HydroColor. It highlights the transformative potential in addressing water quality research gaps.
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This review explores using advanced image-based methods to estimate snow parameters for water resource management. Deep learning and satellite imagery improve accuracy in predicting snowmelt and depth. Challenges like data availability persist; addressing them requires novel deep learning architectures and better data synchronization. Integration of image-based approaches can revolutionize snow hydrology modeling and environmental management.
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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.
We studied 59 years of daily river flow, snow depth, and air temperature for a sub-Arctic river...