Articles | Volume 8, issue 1
Adv. Sci. Res., 8, 171–177, 2012
https://doi.org/10.5194/asr-8-171-2012
Adv. Sci. Res., 8, 171–177, 2012
https://doi.org/10.5194/asr-8-171-2012

  17 Sep 2012

17 Sep 2012

Statistical analysis of inter-arrival times of rainfall events for Italian Sub-Alpine and Mediterranean areas

C. Agnese1, G. Baiamonte1, C. Cammalleri2, D. Cat Berro3, S. Ferraris4, and L. Mercalli3 C. Agnese et al.
  • 1Università degli Studi di Palermo, Dip. SAGA, Palermo, Italy
  • 2Università degli Studi di Palermo, DICAM, Palermo, Italy
  • 3Società Meteorologica Italiana, Castello Borello, Bussoleno (TO), Italy
  • 4Università degli Studi di Torino, DIST, Torino, Italy

Abstract. 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.