Quality Control and Homogeneity of Precipitation Data in the Southwest of Europe

Abstract A quality control process involving outliers processing, homogenization, and interpolation has been applied to 95 monthly precipitation series in the Iberian Peninsula, southern France, and northern Africa during the period 1899–1989. A detailed description of the procedure results is provided and the impact of adjustments on trend estimation is discussed. Outliers have been censored by trimming extreme values. Homogeneity adjustments have been developed by applying the Standard Normal Homogeneity Test in combination with an objective methodology to select reference series. The spatial distribution of outliers indicates that they are due to climate variability rather than measurement errors. After carrying out the homogeneity procedure, 40% of the series were found to be homogeneous, 49.5% became homogeneous after one adjustment, and 9.5% after two adjustments. About 30% of the inhomogeneities could be traced to information in the scarce history files. It is shown that these data present severe h...

[1]  David A. Rhoades,et al.  ADJUSTMENT OF TEMPERATURE AND RAINFALL RECORDS FOR SITE CHANGES , 1993 .

[2]  M. J. Esteban‐Parra,et al.  Spatial and temporal patterns of precipitation in Spain for the period 1880–1992 , 1998 .

[3]  José Antonio López Díaz,et al.  Homogeneidad y variabilidad de los registros históricos de precipitación de España , 1996 .

[4]  L. W. Pollak,et al.  Methods in Climatology (Second Edition) , 1950 .

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

[6]  Hans von Storch,et al.  The Atmospheric Circulation and Sea Surface Temperature in the North Atlantic Area in Winter: Their Interaction and Relevance for Iberian Precipitation , 1992 .

[7]  Claude N. Williams,et al.  An Approach to Adjusting Climatological Time Series for Discontinuous Inhomogeneities , 1987 .

[8]  B. Santer,et al.  A Grid Point Surface Air Temperature Data Set for the Northern Hemisphere , 1985 .

[9]  J. Houghton,et al.  Climate change 1995: the science of climate change. , 1996 .

[10]  J. Hurrell Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation , 1995, Science.

[11]  M. L. Martín,et al.  An overview of a heavy rain event in southeastern Iberia: the role of large-scale meteorological conditions , 1997 .

[12]  Filling Data Algorithms in Urban Air Pollution Monitoring Networks , 1997 .

[13]  T. A. Buishand,et al.  SOME METHODS FOR TESTING THE HOMOGENEITY OF RAINFALL RECORDS , 1982 .

[14]  B. Santer,et al.  Detecting anthropogenic climate change with an optimal fingerprint method , 1994 .

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

[16]  F. Valero,et al.  On long-term evolution of seasonal precipitation in southwestern Europe , 1996 .

[17]  D. Hawkins Testing a Sequence of Observations for a Shift in Location , 1977 .

[18]  K. Trenberth Some Effects of Finite Sample Size and Persistence on Meteorological Statistics. Part I: Autocorrelations , 1984 .

[19]  D. Easterling,et al.  Homogeneity adjustments of in situ atmospheric climate data: a review , 1998 .

[20]  Thomas C. Peterson,et al.  Global historical climatology network (GHCN) quality control of monthly temperature data , 1998 .

[21]  P. Maheras Changes in precipitation conditions in the western mediterranean over the last century , 1988 .

[22]  F. Valero,et al.  A METHOD FOR THE RECONSTRUCTION AND TEMPORAL EXTENSION OF CLIMATOLOGICAL TIME SERIES , 1996 .

[23]  Inger Hanssen-Bauer,et al.  Homogenizing Long Norwegian Precipitation Series , 1994 .

[24]  J. Durbin,et al.  Testing for serial correlation in least squares regression. I. , 1950, Biometrika.

[25]  Susana Nieto,et al.  Spatial and temporal patterns of annual precipitation variability over the Iberian Peninsula , 1998 .

[26]  K. Trenberth,et al.  The Northern Hemisphere Sea-Level Pressure Data Set: Trends, Errors and Discontinuities , 1980 .

[27]  J. Bongaarts,et al.  Climate Change: The IPCC Scientific Assessment. , 1992 .

[28]  G. F. Mills Principal Component Analysis of precipitation and rainfall regionalization in Spain , 1995 .

[29]  M. J. Esteban‐Parra,et al.  Spatial and temporal patterns of precipitation in Spain for the period 1880–1992 , 1998 .

[30]  J. A. García,et al.  Homogeneidad y variabilidad natural de series largas de precipitación. , 1996 .

[31]  John R. Lanzante,et al.  Resistant, Robust and Non-Parametric Techniques for the Analysis of Climate Data: Theory and Examples, Including Applications to Historical Radiosonde Station Data , 1996 .

[32]  Randy A. Peppler,et al.  North Atlantic Oscillation: Concept and an Application , 1987 .

[33]  Henry F. Diaz,et al.  The Quality Control of Long-Term Climatological Data Using Objective Data Analysis , 1995 .

[34]  Tom M. L. Wigley,et al.  Towards the detection and attribution of an anthropogenic effect on climate , 1995 .

[35]  Hans von Storch,et al.  Taking Serial Correlation into Account in Tests of the Mean. , 1995 .

[36]  M. L. Martín,et al.  Detecting long-term variations in precipitation in the Southeastern Iberian Peninsula , 1993 .

[37]  J. Durbin,et al.  Testing for serial correlation in least squares regression. II. , 1950, Biometrika.

[38]  E. Zorita,et al.  Agreement between Observed Rainfall Trends and Climate Change Simulations in the Southwest of Europe , 2000 .