On the Climate Characteristics of Convection Contribution to Precipitation in Southeastern Europe
The spatial and temporal variability of the convective percentage of precipitation in the Italian and Balkan peninsulas and the surrounding areas are examined for autumn, winter and spring. The data used consists of monthly grid point values of Convective Precipitation Rate (CPR) and Total Precipitation Rate (TPR) in the southeastern Europe for the 60-year period 1950–2009. The seasonal values are calculated from the monthly ones and the Convective Precipitation Percentage (CPP) is calculated, dividing CPR by TPR. The seasonal average patterns of CPP are characterized by a maximum over the sea and a minimum over the northern continental areas. The CPP over the sea is highest in autumn and lowest in spring, while CPP over the land is highest in spring and lowest in winter. The inter-annual variability of CPP is examined by applying S-mode Factor Analysis to the three seasonal data matrices. Only 12, 11 and 10 factors are retained for autumn, winter and spring. For all seasons, statistical significant of CPP trends are found: a decrease in central Europe and northern Italy and an increase in the area west of Sicily. These trends are possibly connected to the variability of the large-scale synoptic systems affecting the region.
KeywordsConvective Precipitation Mann Kendall Test Balkan Peninsula Area West Large Scale Warming
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