A homogeneous dataset for rainfall trend analysis in the Calabria Region (Southern Italy)

Caloiero T.; Filice E.; Coscarelli R.; Pellicone G., 2020, A homogeneous dataset for rainfall trend analysis in the Calabria Region (Southern Italy), Water (Basel) 12 (2020). doi_10.3390/w12092541,
URL: http://www.cnr.it/prodotto/i/437159

In order to investigate the tendency in rainfall amount in Calabria (southern Italy), in this work, monthly rainfall series were first tested for homogeneity and then a trend analysis was performed. In particular, a homogenization approach based on the Climatol method was applied to homogenize monthly climatological series. Then, the Mann-Kendall non-parametric test and the Theil-Sen estimator were applied to evaluate the presence of trends and their significance in the monthly, seasonal and annual rainfall series. Moreover, the trend slopes were further evaluated with a linear regression analysis. At the annual scale, results evidenced a decreasing trend mainly in the north-eastern part of the region. At the seasonal scale, a spatial distributed negative trend in winter, and a positive trend in summer, mainly localized in the north-western part of the region, were identified. Finally, on a monthly scale negative trends spreading across the region were detected in January and December, with an opposite behavior in July and especially in September, when almost the entire region presented a positive trend.

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