Energy Exchanges for Mediterranean Weather Systems |
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| Authors: | M Abdel Wahab H Abdel Basset |
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| Institution: | (1) Department of Astronomy and Meteorology, Faculty of Science, Cairo University, Cairo, Egypt, EG;(2) Department of Astronomy and Meteorology, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt, EG |
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| Abstract: | Summary An analysis of the kinetic energy budget is made for a cyclonic development over the Mediterranean. Horizontal flux convergence
constitutes a major energy source. Generation of kinetic energy via cross-contour flow is a persistent sink except only a
weak energy source for the decay period of our case study. Dissipation of kinetic energy, computed as a residual, has local
maxima both in the lower troposphere and near the jet stream level. By investigating the relative importance of divergent
and non-divergent components in the kinetic energy budget we found that when calculating the magnitude of the kinetic energy
one may safely replace the total wind with the non-divergent one. But the horizontal flux convergence of kinetic energy and
the generation of kinetic energy are sensitive to the magnitude of the divergent wind.
A large increase in the kinetic energy of the total flow fields and the nondivergent component of the flows occurs over the
southeastern Mediterranean with the existence of the subtropical jet. This indicates that the subtropical jet steadily receives
energy from divergent flow. Maximum energy conversion and transport occur near the time of maximum storm intensity while smaller
values are observed during the development and decay stages.
Received July 2, 1998/Revised December 28, 1998 |
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