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Alexandersson (1986) developed a standard normal homogeneity Is likely to have occurred (Solow, 1987). Where the change in the mean value of the observations Change-pointĪnalysis is one of the methods often used for examiningĬlimate data inhomogeneities and studying undocumentedĭiscontinuities and it directly addresses the question of Several methods have been developed for homogenization of climatological records. Therefore, it is important to address these factors in order to develop homogenized records for studying climate change. Method of data collection, and changes in the g eneral surroundings of a station (Karl and Williams, 1987 PetersonĪnd Easterling, 1994 Jones, 1995). Received 11 July 2006 Revised 13 September 2006 Accepted 16 September 2006Ĭlimatological records often contain inhomogeneitiesīecause of logistic problems, such as station relocations,Įquipment changes, equipment drifts, changes in the

Copyright  2006 Royal Meteorological SocietyĬhange-point homogenization Monte Carlo simulations normal distribution SNHT statistical inference These critical values mimic the tails of the SNHT statistic better and therefore are more accurate,Īnd would be useful for making correct statistical inference for climate data homogenization and assessment of climate Standard errors, are developed for 108 sample sizes ranging from 10 to 50 000 using 30 replicates of one million samplesįor each sample size. Improve the critical values of the SNHT and extend them to large sample sizes. Sizes ranging from 10 to 250 using relatively short Monte Carlo simulations (MCS). The critical values of this test were originally developed for sample The use of the standard normal homogeneity test (SNHT) for homogenization of climatological records and studyingĬhanges in their patterns has increased in recent years. University of Quebec, 490 de la Couronne, Quebec City, Quebec G1K 9A9, Canada Ouranos Consortium on Regional Climatology and Adaptation to Climate Change, 550 Sherbrooke Street West, West Tower, 19th Floor,ī NSERC/Hydro-Quebec Statistical Hydrology Chair, Canada Research Chair on the Estimation of Hydrological Variables, INRS-ETE, On the critical values of the standard normal homogeneity Published online 7 November 2006 in Wiley InterScience