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HOMOGENEITY OF THE ECA TEMPERATURE DATA PowerPoint Presentation
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HOMOGENEITY OF THE ECA TEMPERATURE DATA

HOMOGENEITY OF THE ECA TEMPERATURE DATA

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HOMOGENEITY OF THE ECA TEMPERATURE DATA

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

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

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

  4. 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

  5. Von Neumann Ratiofor Eelde Groningen • N= 0.55 period: 1910-1998 • N=1.85 period: 1958-1998

  6. SNHT Range test Von Neumann Ratio