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C. Agnese; G. Baiamonte; C. Cammalleri; D. Cat Berro; S. Ferraris; L. Mercalli (2012)
Publisher: Copernicus Publications
Journal: Advances in Science and Research
Languages: English
Types: Article
Subjects: Meteorology. Climatology, QC851-999, Q, Science, Physics, QC1-999
In this work a set of time-series of inter-arrival times of rainfall events, at daily scale, was analysed, with the aim to verify the issue of increasing duration of dry periods. The set consists of 12 time-series recorded at rain gauges in 1926–2005, six of them belong to an Italian Sub-Alpine area (Piedmont) and six to a Mediterranean one (Sicily). In order to overcome the problem related to limited sample size for high values of inter-arrival times, the discrete probability polylog-series distribution was used to fit the empirical data from partial (20 yr) time-series. Moreover, a simple qualitative trend analysis was applied to some high quantiles of inter-arrival times as well as to the average extent of rain clusters. The preliminary analysis seems to confirm the issue of increasing duration of dry periods for both environments, which is limited to the ''cold'' season.

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