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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 ...

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