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Iberia01: A new gridded dataset of daily precipitation and temperatures over Iberia

Journal: Earth System Science Data
Year: 2019  
Status: In print
Link to PDF: essd-2019-95.pdf
, Cardoso, R.M., Soares, P. M. M., Espírito-Santo, F., Viterbo, P., Gutiérrez, J.M.

The present work presents a new observational gridded dataset (referred to as Iberia01) for daily precipitation and temperatures produced using a dense network (thousands) of stations over the Iberian Peninsula for the period 1971-2015 at 0.1º regular (and 0.11º CORDEX-compliant rotated) resolutions. We analyze mean and extreme indices and compare the results with the E-OBS v17 dataset (using both the standard and ensemble versions, at 0.25º and 0.1º resolutions, respectively),

in order to assess observational uncertainty in this region. We show that Iberia01 produces more realistic precipitation patterns than E-OBS for the mean and extreme indices considered, although both are comparable for temperatures. To assess the differences between these datasets, a new probabilistic intercomparison analysis was performed, using the E-OBS ensemble (v17e) to characterize observational uncertainty and testing whether Iberia01 falls within the observational uncertainty range provided by E-OBS. In general, uncertainty values are large in all the territory, with the exception of a number of kernels where the uncertainty is small, corresponding to the stations used to build the E-OBS grid. For precipitation, significant differences -at a 10% level- between both datasets were found for less than 25% of days over the Iberian Peninsula. For temperature, a very inhomogeneous spatial pattern was obtained, with either a small (in most of the regions) or large fraction of significantly different days, thus indicating sensible regions for observational uncertainty.

Iberia01 is publicly available (Herrera et al., 2019a, DOI: http://dx.doi.org/10.20350/digitalCSIC/8641).