Abstract
Abstract. An attempt is made to study the characteristics of the extreme warm and cold days over the major area of Greece. To meet this objective, the daily maximum and minimum air temperature values are used, obtained from seventeen (17) synoptic weather stations, covering the broad study area. The extreme warm and cold days are identified based upon the proposed and adopted criteria, which are applied for the period 1961–2000. Seven regional decadal indices measuring the frequency of occurrence, the magnitude and the intensity of the extreme temperature values are calculated. The study of the indices revealed that after the 70' the frequency of occurrence and the intensity of cold days follow a negative trend, as opposed to the frequency of occurrence and the intensity of the warm days that follow a positive trend. Moreover, the proposed indices confirm the cooling conditions that Greece experienced in the 70's and early 80's and the warming trend afterwards.
Highlights
The study of the extreme weather events has received a great emphasis worldwide, as their effects and consequences are encountered to many disciplines, incorporating atmosphere, biosphere and even economy (Chan et al, 2005; Chagnon et al, 2003)
The objective on this study is to clarify whether the frequency of occurrence, the magnitude and the intensity of the extreme air temperature events in Greece have changed during the four last decades of the 20th century
This is accomplished through the development of regional decadal indices, appropriate to calculate the frequency of occurrence, the magnitude and the intensity of the extreme air temperature events and to suitably prescribe, in a general sense, the overall picture and trend of the air temperature regime over the major area of Greece
Summary
The study of the extreme weather events has received a great emphasis worldwide, as their effects and consequences are encountered to many disciplines, incorporating atmosphere, biosphere and even economy (Chan et al, 2005; Chagnon et al, 2003). A great concern should be focused on the wellindicated climatic changes, which are mostly documented through the air temperature and on the influences due to the intensity, frequency of occurrence, duration and severity of the extreme temperature events. The objective on this study is to clarify whether the frequency of occurrence, the magnitude and the intensity of the extreme air temperature events (warm and cold) in Greece have changed during the four last decades of the 20th century. This is accomplished through the development of regional decadal indices, appropriate to calculate the frequency of occurrence, the magnitude and the intensity of the extreme air temperature events and to suitably prescribe, in a general sense, the overall picture and trend of the air temperature regime over the major area of Greece
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