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Atlantic origin of asynchronous European interdecadal hydroclimate variability
Davide Zanchettin1, Thomas Toniazzo2, Carla Taricco3,4
1University Ca'Foscari of Venice, Dept. of Environmental Sciences, Informatics and Statistics, Via Torino 155, 30172, Mestre Venezia, Italy. davide.zanchettin@unive.it.
European river discharge fluctuations show a delayed oscillation, with northern rivers lagging southern rivers by about 5 years. This hydroclimate pattern is linked to North Atlantic atmospheric circulation and ocean-atmosphere dynamics.
Area of Science:
- Hydrology
- Climatology
- Oceanography
Background:
- European river discharge exhibits decadal and interdecadal fluctuations.
- The underlying hydroclimate variability is not well understood due to limited integrated assessments.
Purpose of the Study:
- To investigate the spatio-temporal hydroclimate variability of European river discharge.
- To identify dominant modes of variability and their drivers.
Main Methods:
- Analysis of discharge time series from major European rivers.
- Spatio-temporal assessment of hydroclimate variability.
- Correlation with large-scale atmospheric circulation patterns.
Main Results:
- A meridional delayed oscillation dominates European hydroclimate variability.
- Northern European rivers lag Euro-Mediterranean rivers by approximately 5 years in interdecadal discharge fluctuations.
- This oscillation is connected to North Atlantic atmospheric circulation.
Conclusions:
- A previously unrecognized multiannual atmosphere-ocean mechanism in the subpolar North Atlantic likely drives this oscillation.
- Understanding this mechanism is crucial for predicting European hydroclimate variability.
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