Study of the rain intensity in Athens and Thessaloniki, Greece

摘要

In this study, the mean rain intensity (mm/h) in Athens and Thessaloniki,Greece, is examined during the period 1930–2007. The daily meteorologicaldata were acquired from the meteorological stations of the NationalObservatory of Athens (Thissio) and the University Campus of Thessaloniki.These stations have recorded the longest and reliable daily rain time seriesin Greece.The trends of the annual and seasonal mean, as well as the maximum rainintensity, are analyzed. On the one hand, all of the time series in Athenspresent higher figures of mean rain intensity during the period 1990–2007compared to the period 1930–1990. On the other hand, regarding the timeseries in Thessaloniki, the mean rain intensity remains in lower level thanthe respective one in Athens without significant trend at the ConfidenceLevel (CL) 95%. As far as the annual and seasonal maximum rainintensity is concerned, similar patterns appear. However, the summer maximumrain intensity in Thessaloniki remains at higher levels till 1970's. Theatmospheric circulation patterns for the extreme rain intensities showintense negative anomalies centred over Greece and positive anomalies to thenorth, with centre over Scandinavia.