The Impact of Topography on the Precipitation Regime over Epirus, NW Greece, During the Cold Period of the Year

  • O. A. SindosiEmail author
  • A. Bartzokas
  • V. Kotroni
  • K. Lagouvardos
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)


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.


Vertical Velocity Windward Side Rain Shadow Convective Parameterization Scheme Fine Resolution Grid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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.


  1. Doyle JD, Durran DR (2001) The dynamics of mountain-wave induced rotors. J Atmos Sci 59:186–201CrossRefGoogle Scholar
  2. Hong S, Pan H (1996) Nonlocal boundary layer vertical diffusion in a medium-range forecast model. Mon Weather Rev 124:2322–2339CrossRefGoogle Scholar
  3. Houze RAJ (1993) Cloud dynamics. Academic, San DiegoGoogle Scholar
  4. Kain JS (2004) The Kain-Fritsch convective parameterization: an update. J Appl Meteorol 43:170–181CrossRefGoogle Scholar
  5. Minder JR, Durran DR, Roe GH, Andres AM (2008) The climatology of small-scale orographic precipitation over the Olympic Mountains: patterns and processes. Q J R Meteorolog Soc 134:817–839CrossRefGoogle Scholar
  6. Pathirana A, Herath S, Yamada T (2005) Simulating orographic rainfall with a limited-area, non-hydrostatic atmospheric model under idealized forcing. Atmos Chem Phys 5:215–226CrossRefGoogle Scholar
  7. Schultz P (1995) An explicit cloud physics parameterization for operational numerical weather prediction. Mon Weather Rev 123:3331–3343CrossRefGoogle Scholar
  8. Smith RB (1979) The influence of mountains of the atmosphere. Adv Geophys 21:87–230CrossRefGoogle Scholar
  9. Trigo IF, Bigg GR, Davies TD (2002) Climatology of cyclogenesis mechanisms in the Mediterranean. Mon Weather Rev 130:549–569CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • O. A. Sindosi
    • 1
    Email author
  • A. Bartzokas
    • 1
  • V. Kotroni
    • 2
  • K. Lagouvardos
    • 2
  1. 1.Laboratory of Meteorology, Department of PhysicsUniversity of IoanninaIoanninaGreece
  2. 2.Institute of Environmental Research and Sustainable DepartmentNational Observatory of AthensAthensGreece

Personalised recommendations