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After the wavelet decomposition, the M-K test was applied to the annual precipitation data. Table 3 presents the results of the M-K test. All of the observed precipitations have a decreasing tendency. Moreover, two precipitation stations showed a statistically significant decreasing trend: Afyon (z = −1.98, significant at the 5% level) and Aydın (z = −1.80, significant at the 10% level). These results are also consistent with those of Partal & Kahya (2006), who found significant downward trends in western Turkey precipitations, such as for Aydın and Afyon stations, with data spanning from 1929 to 1993. However, the significance of the decreasing trends found in the previous study seems to have slightly reduced. For example, the z values of the Aydın precipitation have changed from −2 to −1.80.

Table 3

Mann–Kendall test values of the annual precipitations: observed data, detail components (D1–D5), approximations (A4), and a set of combination of the details and approximation

DataMuğlaİzmirAydınManisaEdirneBursaAfyonEskişehir
Observed −1.40 −1.16 −1.80* −1.40 −0.98 −1.16 −1.98** −1.42 
D1 −0.07 −0.31 −0.27 −0.46 −0.11 0.22 −0.33 −0.38 
D2 −0.61 −0.62 −0.75 −0.65 −0.28 0.33 −0.67 0.63 
D3 0.69 −1.00 −0.45 −0.79 1.01 0.05 −0.31 0.60 
D4 0.34 1.40 1.20 1.32 0.35 0.76 2.17** 0.17 
D5 −4.30** −2.76** −5.52** −3.22** −1.40 −4.94** −0.63 −3.98** 
−5.50** −5.88** −6.63** −3.63** −6.59** −6.33** −5.88** −1.98** 
D1 + A −1.08 −1.05 −2.31** −1.70* −1.45 −1.42 −2.48** −1.05 
D2 + A −2.33** −1.70* −4.52** −2.56** −1.98** −2.27** −3.97** −0.98 
D3 + A −1.10 −2.17** −4.80** −2.57** −1.62 −2.72** −4.13** −0.72 
D4 + A −1.61 −0.25 −2.94** −0.99 −2.35** −1.51 −3.66** −1.76* 
D5 + A −5.97** −5.29** −8.81** −1.80* −4.49** −6.94** −2.98** −1.60 
DataMuğlaİzmirAydınManisaEdirneBursaAfyonEskişehir
Observed −1.40 −1.16 −1.80* −1.40 −0.98 −1.16 −1.98** −1.42 
D1 −0.07 −0.31 −0.27 −0.46 −0.11 0.22 −0.33 −0.38 
D2 −0.61 −0.62 −0.75 −0.65 −0.28 0.33 −0.67 0.63 
D3 0.69 −1.00 −0.45 −0.79 1.01 0.05 −0.31 0.60 
D4 0.34 1.40 1.20 1.32 0.35 0.76 2.17** 0.17 
D5 −4.30** −2.76** −5.52** −3.22** −1.40 −4.94** −0.63 −3.98** 
−5.50** −5.88** −6.63** −3.63** −6.59** −6.33** −5.88** −1.98** 
D1 + A −1.08 −1.05 −2.31** −1.70* −1.45 −1.42 −2.48** −1.05 
D2 + A −2.33** −1.70* −4.52** −2.56** −1.98** −2.27** −3.97** −0.98 
D3 + A −1.10 −2.17** −4.80** −2.57** −1.62 −2.72** −4.13** −0.72 
D4 + A −1.61 −0.25 −2.94** −0.99 −2.35** −1.51 −3.66** −1.76* 
D5 + A −5.97** −5.29** −8.81** −1.80* −4.49** −6.94** −2.98** −1.60 

*Indicates significant trend values at p = 10%.

**Indicates significant trend values at p = 5%.

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