E. Batchvarova et Se. Gryning, WIND CLIMATOLOGY, ATMOSPHERIC-TURBULENCE AND INTERNAL BOUNDARY-LAYER DEVELOPMENT IN ATHENS DURING THE MEDCAPHOT-TRACE EXPERIMENT, Atmospheric environment, 32(12), 1998, pp. 2055-2069
This paper presents an analysis of wind field and atmospheric turbulen
ce in Athens, Greece covering a typical late-summer period with prevai
ling northerly wind. The wind climatology study shows a distinct diffe
rence between the northern and southern parts of the urban area. In th
e northern part of Athens the northerly flows (315 degrees-45 degrees)
occur more than 60% of the time and the winds from all other directio
ns are equally frequent (about 5% per 30 degrees sector). In the south
ern part of Athens the northerly flows are more than 50%, but southerl
y flows (165 degrees-225 degrees) occur about 25% of the time indicati
ng sea breeze development. The variability of the flow characteristics
in the whole area was classified into three categories: northerly win
ds in the whole Athens bar:in; sea breeze throughout the whole Athens
basin; and changing sea breeze (comprising partial penetration of the
sea breeze over the city and/or changing wind direction throughout the
day). This classification was used as basis for the investigation of
the atmospheric turbulence and vertical profiles of meteorological par
ameters over the area. A model of the internal boundary layer height o
ver an area with irregular coastline (Gryning and Batchvarova (1996) B
oundary Layer Meteorology 78, 405-413) is applied for an Athens site a
nd the results are in good agreement with the measurements. (C) 1998 P
ublished by Elsevier Science Ltd. All rights reserved.