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Winter precipitation in Western Italian Alps (1926–2010)

Trends and connections with the North Atlantic/Arctic Oscillation

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Abstract

Six snow depth and total precipitation time series recorded in Western Italian Alps between 960 and 2,177 m a.s.l. have been analyzed to investigate variability and trends over the period 1926–2010. The results outline a significant decrease of snow depth in the period 1951–2010 ranging from −0.2 cm/year in the lowest station up to −1.4 cm/year in the highest one. The contribution to this negative trend comes mainly from spring. These results have been related to the changes in the amount/frequency of total precipitation and to the temperatures analyzed in former studies. The connections between winter precipitation and large-scale atmospheric forcings have been investigated by looking for regular oscillations embedded in the time series. Two different techniques have been used, the MultiTaperMethod and the Monte Carlo Singular Spectral Analysis. Both highlight oscillations corresponding to 2.4–2.7 year periods which are found to be driven by the North Atlantic Oscillation.

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Acknowledgements

We gratefully acknowledge the valuable help from Marco Cordola in recovering and collecting a part of the dataset (STR.ADA project) and the patient work of digitization carried out by Daniela Testa, Noemi Canevarolo and Matteo Collimedaglia. Thanks to Fiorella Acquaotta for the fruitful discussion risen during the work. Finally, thanks to two anonymous referees for their helpful comments and suggestions to improve the paper.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Torino, Via Valperga Caluso, 35-10125, Torino, Italy

    S. Terzago & S. Fratianni

  2. Regional Agency for Environmental Protection (ARPA) of Piemonte, Via Pio VII, 9-10135, Torino, Italy

    R. Cremonini

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  1. S. Terzago
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  2. S. Fratianni
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Correspondence to S. Terzago.

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Responsible editor: S. Trini Castelli.

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Terzago, S., Fratianni, S. & Cremonini, R. Winter precipitation in Western Italian Alps (1926–2010). Meteorol Atmos Phys 119, 125–136 (2013). https://doi.org/10.1007/s00703-012-0231-7

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