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Snow trends in Northern Spain: analysis and simulation with statistical downscaling methods
Title: Snow trends in Northern Spain: analysis and simulation with statistical downscaling methods
Authors: Pons Reynés, María Rosa ORCID RESEARCHERID Autor AEMETSan-Martín, DanielHerrera García, SixtoGutiérrez Llorente, José Manuel
Keywords: Cambio climático; Nieve; Climatología estadística; Frecuencia de las precipitaciones; Statistical downscaling; Snow occurrence
Issue Date: 2009
Publisher: Royal Meteorological Society; Wiley
Citation: International Journal of Climatology. 2010, 30 (12), p. 1795-1806
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Abstract: In this study we analyze and simulate (with statistical downscaling techniques) the snow trends observed in the Northern Iberian Peninsula using daily snow occurrence (DSO) data from a network of 33 stations ranging from 60 to 1350 m. We first analyze the annual snow frequency measured as the annual number of snow days (NSD), obtaining a significant decreasing trend since the mid-seventies with a NSD reduction of about 50%; moreover, this magnitude is similar for low and high stations and for winter and spring separately. Then, we analyze the existing correlations with mean temperature and precipitation occurrence obtaining different relationships depending on the season and elevation. Finally, we simulate the observed trends using the connection of DSO with large-scale fields simulated by a General Circulation Model; for this purpose we apply an analog-based statistical downscaling method to obtain an estimation of DSO, working in perfect prognosis conditions using reanalysis data. On the one hand, the downscaling method is able to estimate/predict the DSO with typical values of hit and false alarm rates around 60% and 2%, respectively. On the other hand, the annual frequency obtained by averaging the DSO estimations reproduces very well both the observed trends and the high inter-annual variability. These promising results open the possibility to future research in seasonal or climate change projections of snow frequency.
Sponsorship : The authors are also grateful to the University of Cantabria, CSIC and the Comisión Interministerial de Ciencia y Tecnología (CICYT, CGL-2007-64387/CLI and CGL2005-06966-C07-02/CLI) for partial support of this work.
ISSN: 0899-8418
Appears in Collections:Artículos científicos 2005-2009

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