Extreme rainfall in the Lombardy region

作者：Parisi Simone Gabriele^*; Mariani Luigi; Cola Gabriele

来源：Italian Journal of Agrometeorology-Rivista Italiana di Agrometeorologia, 2014, 19(1): 19-28.

• precipitation
• extreme rainfall events
• climatology

The climatology of extreme precipitation in Lombardy has been based on 1951 2005 daily data as reference period on the base of a network of 30 rain gauges characterized by data availability higher than 95% of total data. Extreme events have been detected dividing the daily rainfall into pre-defined classes (<20 mm "Weak", 204 divided by 50 mm "Moderate", 50 divided by 100 mm "Heavy", and >100 mm "Extreme") and calculating, for the whole dataset, the mean contribution of each class to yearly totals (in terms of percent), defining the relevance of each class to the overall phenomena. In general the analysis shows that Lombardy is physiologically characterized by high precipitation events due to the co-operaton of causal factors like the closeness of a remarkable source of water vapour (the Mediterranean sea), the peculiar shape of the relief (Alps and Apennines) and frequency and persistence of suitable circulation patterns at macro and mesoscale. A trend test performed on the whole territory showed the absence of significative trends in the frequency of extreme events.

• 出版日期2014-4