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Development and analysis of a daily high resolution grid over Spain for 1950-2003 period

In this work a new 0.2º spatial resolution (~20Kms) observational grid for precipitation and extreme temperature is described. This observational grid has been built-up using 3500 stations from INM's (the Spanish National Meteorological Institute) pluviometric network and 850 stations for minimum and maximum temperature from INM's thermometric netwok. Both networks have a temporal coverage from 1950 to 2003 with daily measurement aggregation.
Firstly, commonly used interpolation methods have been compared -kriging, kernels method, angular distance weighting and thin plate splines-, with differents times scales -daily, weekly and monthly-. In this work it is shown how the performance of the different methods depends on the aggregation time scale.
Secondly, to explore the utility of the grid an analysis of the climatology, trends and teleconnections with El Nino-Southern Oscillation (ENSO) and North Atlantic Oscillation (NAO) for precipitation and extreme temperatures has been made.

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