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Characteristics of the atmospheric circulation associated with cold-season heavy rainfall and flooding over a complex terrain region in Greece
Authors:G A Efstathiou  C J Lolis  N M Zoumakis  P Kassomenos  D Melas
Institution:1. Laboratory of Meteorology, Department of Physics, University of Ioannina, Ioannina, 45 110, Greece
2. Environmental Process Laboratory, Atmospheric Physics Group, Alexander Technological Educational Institution of Thessaloniki, Thessaloniki, Greece
3. Laboratory of Atmospheric Physics, Department of Applied and Environmental Physics, School of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
Abstract:Raingauge data from four meteorological stations in Chalkidiki peninsula (Greece) were used to identify the characteristics of the synoptic circulation patterns associated with cold-season heavy rainfall events and corresponding flooding over the area. Precipitation climatology over the complex topography of Chalkidiki is characterized by limited annual rainfall, but in the occurrence of heavy rainfall episodes daily accumulations are exceptionally high with increased precipitation rates, leading often to severe flooding. Fifty-five cases of high daily accumulations for the period of 1997 to 2010, mostly observed during December and October, were classified into eight clusters by applying S-Mode Factor Analysis and Cluster Analysis to the ERA-Interim grid point reanalysis data. The results revealed that, in most cases, intense rainfall and flooding is produced by synoptic scale disturbances that generate and sustain cyclonic activity over south Italy, the Ionian, and less frequently over the Aegean Sea. In particular, the atmospheric circulation patterns associated with heavy rainfall are characterized by the presence of a southeasterly–easterly low-level humid flow over Chalkidiki in conjunction with the potentially unstable lower troposphere influenced by mid-level cyclonic vorticity advection and enhanced low-level convergence over the complex terrain.
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