Effects of onshore and offshore topography on sea breeze circulation: An observational study at eastern Attica,Greece |
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| Authors: | M Varvayanni C G Helmis G T Amanatidis D N Asimakopoulos J G Bartzis A Soilemes K H Papadopoulos H D Kambezidis |
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| Institution: | (1) National Center for Scientific Research  Demokritos , Institute of Nuclear Technology and Radiation Protection, 153 10 Aghia Paraskevi, Athens, Greece;(2) Department of Physics, Laboratory of Meteorology, University of Athens, Greece;(3) Institute of Meteorology and Physics of the Atmospheric Environment, National Observatory of Athens, Greece |
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| Abstract: | Field measurements of wind, air temperature and humidity were taken at the eastern part of the Attika district in June 1991, to examine the topographic influences exerted on the local sea breezes. These influences are due either to the elongated Evia island, faced by the northern half of Attica coastline some tens of kilometers offshore, or to the coast-parallel range of Hymettos mountain, rising steeply 12 km onshore. The instrumentation consisted mainly of three tethered meteorological balloons released at characteristic sires (i.e., the coast, a location between shoreline and mountain foot and the mountain top) and three autographic ground-based anemometers operating at selected locations. Data from the ground-based and upper air stations of the Hellenic National Meteorological Service, as well as the diurnal weather maps were also obtained and analyzed. Observations were made under different synoptic wind and the latter was found to determine remarkably the significance of the topographic effects. A preliminary two-dimensional numerical approach was also made concerning the sea breeze capability to reach the Hymettos mountain top in the case of a weak opposing geostrophic flow. |
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| Keywords: | Complex terrain sea breeze evolution sea breeze propagation sea breeze rotation synoptic effects numerical approach |
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