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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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Presentation Transcript
slide1

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

slide2

CRADDOCK TEST

A

B

Where is the in homogeneity? In A or B?

slide4

CORRECTION

To be corrected

SHIFT

RATIO

slide5

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

slide6

EXAMPLE

Unsteadiness in the first derivation of the Craddock function

1st January 1933: Changes in the observation times

slide9

DAILY HOMOGENIZATION

Unsteadiness in the first derivation of the Craddock function

1st January 1933: Changes in the observation times

slide10

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.

slide11

SERIE GIORNALIERE

Only the coherentcurveswereusedtocalculate the meancorrectingfactorseries

slide17

SOME STATISTICS

25 OUTLIERS

34 BREAKS

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