Quality control and homogeneity of Turkish precipitation data

Ozan Mert Göktürk*, Deniz Bozkurt, Ömer Lütfi Şen, Mehmet Karaca

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Outlier trimming and homogeneity checking/correction were performed on the monthly precipitation time series of various lengths from 267 stations in Turkey. Outlier values are usually found during dry summer months, and are concentrated mostly over the southern parts of the country, where the dry period is most pronounced, implying natural extremes rather than wrong measurements. Homogeneity analysis was done using the Standard Normal Homogeneity Test, on an individual monthly basis, which led to many non-testable series due to lack of reference stations, especially during summer months. Yet, remaining testable months were usually helpful for the assessment of homogenity, revealing a well distributed set of stations that proved to be homogeneous. There were still a number of stations which either could not be tested efficiently, or were classified as inhomogeneous. Lack of metadata is argued to be largely responsible for inefficient homogeneity testing.

Original languageEnglish
Pages (from-to)3210-3218
Number of pages9
JournalHydrological Processes
Issue number16
Publication statusPublished - 30 Jul 2008


  • Homogeneity
  • Interpolation
  • Outlier
  • Precipitation
  • Quality control
  • Station data
  • Turkey


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