Evaluation of global precipitation data sets over the Iberian Peninsula

[1] A new publicly available daily gridded precipitation data set over mainland Portugal is presented. This data set is also combined with a recent Spanish data set to obtain a high resolution (0.2° × 0.2°) Iberian data set, labeled IB02. This data set covers the period from 1950 to 2003 and is based on a dense network, with more than 2000 and 400 quality-controlled stations over Spain and Portugal, respectively. The ordinary kriging method, applied over Portugal for consistency with the Spanish data set, performs slightly better than simpler interpolation techniques tested over Portugal. Additionally, this paper evaluates four global gridded data sets: two based on rain gauges (Climate Research Unit (CRU) and Global Precipitation Climate Center (GPCC)) and two European Centre for Medium-Range Weather Forecasts (ECMWF) reanalyses (ERA-40 and ERA-Interim), comparing them with the IB02 data set. The main features of the spatial distribution of IB02 mean annual precipitation are reasonably captured by the global data sets, despite their dry biases, mostly in mountainous regions. The four data sets perform better in western Iberia and are able to identify the major drought spells at the Iberian scale. Despite these similarities, GPCC outperforms CRU and ERA-Interim is superior to ERA-40 with respect to several aspects, such as annual cycle and drought detection. The performance of CRU is similar to that of ERA-Interim. The frequency of wet days is overestimated by reanalyses, mainly by ERA-Interim, while heavy precipitation events are underestimated, mostly by ERA-40. At 5 day scales, ECMWF reanalyses reveal difficulties in predicting the magnitude of precipitation, despite their greater ability to estimate the peak locations.

[1]  H. Kaiser.  The varimax criterion for analytic rotation in factor analysis , 1958 .

[2]  A. Betts,et al.  Evaluation of the ERA-40 Surface Water Budget and Surface Temperature for the Mackenzie River Basin , 2003 .

[3]  A. Betts,et al.  Comparison of river basin hydrometeorology in ERA-Interim and ERA-40 reanalyses with observations , 2009 .

[4]  K. Taylor.  Summarizing multiple aspects of model performance in a single diagram , 2001 .

[5]  Sergio M. Vicente-Serrano,et al.  The influence of atmospheric circulation at different spatial scales on winter drought variability through a semi‐arid climatic gradient in Northeast Spain , 2006 .

[6]  C. Willmott,et al.  Uncertainties in Precipitation and Their Impacts on Runoff Estimates , 2004 .

[7]  E. Serrano,et al.  Winter 10-Day Coupled Patterns between Geopotential Height and Iberian Peninsula Rainfall Using the ECMWF Precipitation Reanalysis , 2002 .

[8]  A. Barrett,et al.  Northern High-Latitude Precipitation as Depicted by Atmospheric Reanalyses and Satellite Retrievals , 2005 .

[9]  Petra Döll,et al.  Estimating the Impact of Global Change on Flood and Drought Risks in Europe: A Continental, Integrated Analysis , 2006 .

[10]  H. Alexandersson.  A homogeneity test applied to precipitation data , 1986 .

[11]  Michael G. Bosilovich,et al.  Intercomparison of water and energy budgets for five Mississippi subbasins between ECMWF reanalysis (ERA‐40) and NASA Data Assimilation Office fvGCM for 1990–1999 , 2003 .

[12]  B. Lamptey,et al.  Comparison of Gridded Multisatellite Rainfall Estimates with Gridded Gauge Rainfall over West Africa , 2008 .

[13]  M. Llasat,et al.  Sensitivities of a Flash Flood Event over Catalonia: A Numerical Analysis , 2007 .

[14]  P. Goovaerts.  Ordinary Cokriging Revisited , 1998 .

[15]  T. McKee,et al.  THE RELATIONSHIP OF DROUGHT FREQUENCY AND DURATION TO TIME SCALES , 1993 .

[16]  A. Serrano,et al.  Monthly Modes of Variation of Precipitation over the Iberian Peninsula. , 1999 .

[17]  B. Lloyd‐Hughes,et al.  A drought climatology for Europe , 2002 .

[18]  J. Hay,et al.  High-resolution studies of rainfall on Norfolk Island: Part II: Interpolation of rainfall data , 1998 .

[19]  M. Fragoso,et al.  Classification of daily abundant rainfall patterns and associated large‐scale atmospheric circulation types in Southern Portugal , 2008 .

[20]  P. Jones,et al.  Representing Twentieth-Century Space–Time Climate Variability. Part I: Development of a 1961–90 Mean Monthly Terrestrial Climatology , 1999 .

[21]  P. Goovaerts.  Geostatistical approaches for incorporating elevation into the spatial interpolation of rainfall , 2000 .

[22]  M. Hulme,et al.  Dependence of Large-Scale Precipitation Climatologies on Temporal and Spatial Sampling , 1997 .

[23]  Philip W. Jones.  First- and Second-Order Conservative Remapping Schemes for Grids in Spherical Coordinates , 1999 .

[24]  A. Dai,et al.  Hydrometeorology of the Amazon in ERA-40 , 2005 .

[25]  David J. Stensrud,et al.  The Correspondence Ratio in Forecast Evaluation , 2000 .

[26]  T. D. Mitchell,et al.  An improved method of constructing a database of monthly climate observations and associated high‐resolution grids , 2005 .

[27]  J. Thepaut,et al.  Assimilation and Modeling of the Atmospheric Hydrological Cycle in the ECMWF Forecasting System , 2005 .

[28]  Clayton V. Deutsch,et al.  GSLIB: Geostatistical Software Library and User's Guide , 1993 .

[29]  J. Guijarro,et al.  A 30‐year (1964–1993) daily rainfall data base for the Spanish Mediterranean regions: first exploratory study , 1998 .

[30]  Sergio M. Vicente-Serrano,et al.  A New Global 0.5° Gridded Dataset (1901–2006) of a Multiscalar Drought Index: Comparison with Current Drought Index Datasets Based on the Palmer Drought Severity Index , 2010 .

[31]  J. Martín-Vide,et al.  Regionalization of Peninsular Spain based on the length of dry spells , 1999 .

[32]  P. Štěpánek,et al.  Data quality control and homogenization of air temperature and precipitation series in the area of the Czech Republic in the period 1961–2007 , 2009 .

[33]  S. Vicente‐Serrano.  Spatial and temporal analysis of droughts in the Iberian Peninsula (1910–2000) , 2006 .

[34]  P. Jones,et al.  A European daily high-resolution gridded data set of surface temperature and precipitation for 1950-2006 , 2008 .

[35]  F. Giorgi,et al.  Validation of a high-resolution regional climate model for the alpine region and effects of a subgrid-scale topography and land use representation. , 2010 .

[36]  J. Thepaut,et al.  The ERA‐Interim reanalysis: configuration and performance of the data assimilation system , 2011 .

[37]  C. Frei,et al.  Comparison of six methods for the interpolation of daily, European climate data , 2008 .

[38]  S. Herrera,et al.  Development and analysis of a 50‐year high‐resolution daily gridded precipitation dataset over Spain (Spain02) , 2012 .

[39]  Pedro M. A. Miranda,et al.  ERA‐40 reanalysis hydrological applications in the characterization of regional drought , 2008 .

[40]  A. Sterl,et al.  The ERA‐40 re‐analysis , 2005 .

[41]  Francisco P. J. Valero,et al.  Quality Control and Homogeneity of Precipitation Data in the Southwest of Europe , 2001 .

[42]  Inmaculada Pulido-Calvo,et al.  Spatial and temporal variability of droughts in Portugal , 2010 .

[43]  Sergio M. Vicente-Serrano,et al.  Differences in Spatial Patterns of Drought on Different Time Scales: An Analysis of the Iberian Peninsula , 2006 .