Spatial and temporal analysis of dry spells in Greece |
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| Authors: | Chr Anagnostopoulou P Maheras T Karacostas M Vafiadis |
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| Institution: | (1) Department of Meteorology and Climatology, University of Thessaloniki, Greece, GR;(2) Division of Hydraulics, Faculty of Technology, University of Thessaloniki, Greece, GR |
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| Abstract: | Summary ?A spatio-temporal analysis of the dry spells that occur in the Greek area is carried out for an extended period of 40 years
(1958–1997). The dry spells can be defined as a number of consecutive days with no rain. The number of days defines the length
of the dry spells. The longest spells are identified in central (Cyclades) and the south-east Aegean Sea whereas dry spells
with the minimum length are shown over the north-west of the Greek area that reflects the significance of the latitude and
the topography. Negative Binomial Distribution and Markov Chains of second order have been used to fit the duration of the
dry spells of different lengths. The study of the seasonal and annual distribution of the frequency of occurrence of dry spells
revealed that the dry spells in Greece depict a seasonal character, while medium and long sequences are associated with the
duration and hazards of drought.
Received February 20, 2002; revised September 5, 2002; accepted October 6, 2002 |
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