The role of the interaction between polar and subtropical jet in a case of depression rejuvenation over the Eastern Mediterranean |
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Authors: | N G Prezerakos H A Flocas D Brikas |
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Institution: | (1) General Department of Mathematics, Technological Education Institute of Piraeus, Greece;(2) Department of Applied Physics, Faculty of Physics, University of Athens, Greece;(3) Hellenic National Meteorological Service, Hellinicon, Greece |
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Abstract: | Summary In this paper, an attempt is made to investigate the synoptic-scale atmospheric conditions and dynamic processes leading to
the rejuvenation of depressions or cyclogenesis over the Eastern Mediterranean during the cold period of the year. A case
study analysis is carried out when the Polar Front Jet (PFJ) is positioned to the south of its normal seasonal position and
interacts with the Subtropical Jet Stream (SJS), which is positioned to the north of its normal seasonal position. It was
found that the vigorous rejuvenation of a northeastwards moving Atlas mountains depression on 15 March 1998 over Cyprus region
is associated with an increase of the hydrodynamic instability due to the juxtaposition of a polar front jet streak to the
subtropical jet stream. Furthermore, the rejuvenation is related to the combined effect of the direct and indirect cross vertical
circulations appearing on the right side of the entrance of a polar jet streak and the left side of a subtropical jet streak
exit, respectively. |
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Keywords: | |
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