A study of frost events in areas characterised by the absence of observations |
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| Authors: | P Kassomenos H A Flocas S Lykoudis M Petrakis |
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| Institution: | (1) Present address: Institute of Meteorology and Physics of the Atmospheric Environment, National Observatory of Athens, P. O. Box 20048, GR-11810 Athens, Greece;(2) Present address: Department of Applied Physics, Laboratory of Meteorology, University of Athens, Build. PHYS-V, GR-15784 Athens, Greece |
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| Abstract: | Summary Serious events of radiative frost were reported in an important agricultural area of central Macedonia, the valley of Lagadas, at the end of March 1994. Since the phenomenon has a strong local character and no surface observations are available, a simulation is performed using a three dimensional numerical model in order to investigate the horizontal and vertical thermal structure of the lower troposphere during the frost event. The synoptic analysis reveals that the background flow was weak, associated with anticyclonic circulation and insignificant pressure gradient in the lower troposphere. Under these synoptic conditions, it was demonstrated that the meteorological model represents successfully the temperature and wind fields over the valley of Lagadas during the frost event. It appears that the model can serve as an alternative method to analyse the characteristics of the radiative frost that occurs very frequently over the examined area associated with substantial economic repercussion.With 10 Figures |
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