HOMOGENEITY OF THE ECA TEMPERATURE DATA

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Presentation transcript:

HOMOGENEITY OF THE ECA TEMPERATURE DATA Janet Wijngaard Albert Klein Tank BUDAPEST, 25-29 SEPTEMBER

HomogeneityTests Standard Normal Homogeneity Test (SNHT, Alexandersson) Range test (Buishand) Von Neumann ratio

Testing method No reference stations used - stations are diverse Annual DTR series tested - artificial changes opposite effect - natural changes same effect

CONCLUSIONS Test results for the examples are satisfactory Summarised results for SNHT, Range-test and Von Neumann Ratio overview of homogeneity Meta data should be used to take full advantage of the ECA data set

Von Neumann Ratio for Eelde Groningen N= 0.55 period: 1910-1998 N=1.85 period: 1958-1998

SNHT Range test Von Neumann Ratio