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COST ES0601 Temperature Network 000001 Michele BRUNETTI ([email protected]) I stituto di S cienze dell' A tmosfera e del C lima CONSIGLIO NAZIONALE DELLE RICERCHE Via P. Gobetti, 101 – 40129 BOLOGNA. TARRAGONA 9-11 March 2009. CRADDOCK TEST. A. B.

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COST ES0601

Temperature Network 000001

Michele BRUNETTI

([email protected])

Istituto di Scienze dell'Atmosfera e del Clima

CONSIGLIO NAZIONALE DELLE RICERCHE

Via P. Gobetti, 101 – 40129 BOLOGNA

TARRAGONA

9-11 March 2009


CRADDOCK TEST

A

B

Where is the in homogeneity? In A or B?



CORRECTION

To be corrected

SHIFT

RATIO


SMOOTHING

SMOOTHING OF THE CORRECTING FACTORS

TO IMPROVE THE SIGNAL-TO-NOISE RATIO

CORRECT WITHSMOOTHING

CORRECT WITHOUT SMOOTHING

ORIGINAL

TO AVOID NOT IDENTIFIED OUTLIERS AFFECTING THE ANNUAL CYCLE

Auer et al., 2005, Int. J. Clim., 25, 139-166


EXAMPLE

Unsteadiness in the first derivation of the Craddock function

1st January 1933: Changes in the observation times




DAILY HOMOGENIZATION

Unsteadiness in the first derivation of the Craddock function

1st January 1933: Changes in the observation times


DAILY HOMOGENIZATION

The correction coefficients were calculated on monthly bases, then they were fitted with a trigonometric function in order to obtain daily corrections without discontinuities from one month to another.


SERIE GIORNALIERE

Only the coherentcurveswereusedtocalculate the meancorrectingfactorseries







SOME STATISTICS

25 OUTLIERS

34 BREAKS


















TREND (YEAR)

ORI

HOM




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