The Impact of Topography on the Precipitation Regime over Epirus, NW Greece, During the Cold Period of the Year
The aim of this study is to investigate the impact of orography on the distribution and the amount of precipitation in Epirus, NW Greece, during the cold period of the year. For this reason, a precipitation event with typical wintertime characteristics is considered; i.e. a low pressure system centered northwest of Epirus and moving southeastwards, generating southerly winds and causing extended and heavy precipitation over the area. The case is firstly simulated by applying the numerical meteorological model MM5 in a high resolution grid (2×2km), in which the actual topographical data are incorporated. Then, the model is applied again incorporating modified data of topography, in order to study the differentiations in the fields of the most important meteorological parameters, which are directly related with precipitation. According to the results, the modification of topography changes the flows near the surface, causing a displacement of the convergence zones and thus a new distribution of vertical velocities, which, combined with the new water vapor field, has a direct impact on precipitation.
KeywordsVertical Velocity Windward Side Rain Shadow Convective Parameterization Scheme Fine Resolution Grid
The research work is co-funded by the European Union – European Social Fund (ESF) & National Sources, in the framework of the program “HERAKLEITOS II” of the “Operational Program Education and Life Long Learning” of the Hellenic Ministry of Education, Life Long Learning and religious affairs.
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