# On the Regional Temperature Series Evolution in the South-Eastern Part of Romania
## 3 Results and Discussion  
The minimum, mean, and maximum annual series computed as the average of the annual series recorded at the ten stations are presented in Figure 3. The series values vary in the intervals [4.8, 8.53], [9.72, 12.29], and [14.94, 17.43] for the minimum, mean, and maximum annual series, respectively. The average minimum series significantly increased after 1988: 0.6 \({}^{\circ}\)C--Adamclisi; 0.7 \({}^{\circ}\)C--Sulina and Tulcea; 0.8 \({}^{\circ}\)C--Constanta, Mangalia, and Medgidia; 1.1 \({}^{\circ}\)C--Jurilova; 1.4 \({}^{\circ}\)C--Corugea; 1.5 \({}^{\circ}\)C--Cernavoda and Harsova. Figure 2: Dobrogea and the meteorological stations [67]. The results of the Mann-Kendall trend test for the data series are presented in Table 1. The following symbols are used: *** if the trend is significant at the \(\alpha\) = 0.001 level of significance, ** when it is significant at the \(\alpha\) = 0.01 level of significance, * if the trend is significant at the \(\alpha\) = 0.05 level of significance, and + if the trend is significant at the \(\alpha\) = 0.1 level of significance. A blank cell means that the significance level is greater than 0.1. Q is the slope and B is the intercept computed by [PERSON]'s procedure. At a significance level less than or equal to 0.05, H\({}_{0}\) was rejected for eight minimum temperature series (so the existence of an increasing trend could not be rejected since Q > 0). For the Sulina and Adamclisi minimum series, the trend existence was unable to be rejected at a significance level of 0.1. The null hypothesis was unable to be rejected for the Tulcea minimum series. Only for Constanta, Medgidia, and Mangalia average temperature series was the trend significant at a confidence level of 0.05. Out of ten maximum temperature series, four trends were significant at 0.001 (Cernavoda, Corugea, Harsova, and Jurilovca) and one at 0.01 (Jurilovca). The Kruskal-Wallis test was unable to reject the null hypothesis for the minimum, average, and maximum temperature series sets, and thus the series homogeneity was unable to be rejected. The temperatures varied in Dobrogea during 1961-2013 as follows: the minimum between 5.6 \({}^{\circ}\)C and 8.4 \({}^{\circ}\)C, the average from 10.1 \({}^{\circ}\)C to 11.8 \({}^{\circ}\)C, and the maximum in the interval [13.1, 15.5] (\({}^{\circ}\)C) in the northern part and 15.7 \({}^{\circ}\)C-17.7 \({}^{\circ}\)C in the rest [19]. Despite the analysis of individual series trends, the existence of a trend over the region was not tested because the Mann-Kendall test does not have this capability and no other test has been developed for this aim. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Series** & \multicolumn{3}{c}{**Minimum Series**} & \multicolumn{3}{c}{**Average Series**} & \multicolumn{3}{c}{**Maximum Series**} \\ \hline
**Station** & **Signific.** & **Q** & **B** & **Signific.** & **Q** & **B** & **Signific.** & **Q** & **B** \\ \hline Adamclisi & + & 0.015 & 6.37 & & 0.015 & 10.55 & * & 0.023 & 15.93 \\ Cernavoda & ** & 0.084 & 4.06 & & 0.013 & 10.84 & & \(-\)0.013 & 17.21 \\ Constanta & * & 0.024 & 8.06 & + & 0.020 & 11.40 & * & 0.025 & 15.05 \\ Corugea & *** & 0.078 & 3.04 & + & 0.018 & 9.60 & & \(-\)0.014 & 15.70 \\ Harsova & *** & 0.076 & 3.84 & & 0.013 & 10.70 & & \(-\)0.015 & 17.36 \\ Jurilovca & *** & 0.097 & 3.93 & & 0.014 & 10.67 & ** & \(-\)0.031 & 16.62 \\ Mangalia & * & 0.020 & 7.68 & + & 0.019 & 11.27 & & 0.016 & 14.98 \\ Medgidia & * & 0.024 & 6.03 & & 0.013 & 10.70 & * & 0.026 & 15.90 \\ Sulina & + & 0.018 & 9.00 & & 0.017 & 11.25 & * & 0.025 & 13.73 \\ Tulca & & \(-\)0.003 & 6.76 & & 0.017 & 10.85 & & 0.013 & 16.19 \\ \hline \hline \end{tabular} Note: *** significance level 0.001, ** significance level 0.01, * significance level 0.05, blank cell means a significance level of 0.1.  
\end{table} 
Table 1: Results of the Mann–Kendall trend test. Figure 3: Minimum, maximum, and mean annual series.