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CR 61:277-288 (2014)  -  DOI:

Evaporation trends in Spain: a comparison of Class A pan and Piché atmometer measurements

A. Sanchez-Lorenzo1,2,*, S. M. Vicente-Serrano2, M. Wild3, J. Calbó1, C. Azorin-Molina2, J. Peñuelas4,5

1Department of Physics, University of Girona, 17071 Girona, Spain
2Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), 50059 Zaragoza, Spain
3Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland
4CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193Catalonia, Spain
5CREAF, Cerdanyola del Vallès, 08193 Catalonia, Spain
*Corresponding author:

ABSTRACT: Interest is growing in the trends of atmospheric evaporation demand, increasing the need for long-term time series. This work describes, for the first time, the development of a dataset on evaporation in Spain based on long-term series of Piché and pan measurement records. Piché measurements have been reported for >50 stations since the 1960s. Measurements of pan evaporation, which is a much more widely studied variable in the literature, are also available, but only since 1984 for 21 stations. Particular emphasis was placed on the homogenization of this dataset. Both the mean annual Piché and pan series over Spain showed evaporative increases during the common study period (1985-2011), by a rate of around +0.1 mm d-1 decade-1. Furthermore, using the annual Piché records since the 1960s, an evaporation decline was detected from the 1960s to the mid-1980s, which resulted in a non-significant trend over the entire 1961-2011 period. Our results indicate agreement between the decadal variability of reference evapotranspiration and the surface solar radiation previously reported and the evaporation from Piché and pan measurements, especially during summer. The suitability of Piché records compared to pan evaporation data to represent past trends is discussed.

KEY WORDS: Piché evaporimeter · Pan evaporation · Trends · Spain

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Cite this article as: Sanchez-Lorenzo A, Vicente-Serrano SM, Wild M, Calbó J, Azorin-Molina C, Peñuelas J (2014) Evaporation trends in Spain: a comparison of Class A pan and Piché atmometer measurements. Clim Res 61:277-288.

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