The Effect of Moisture on the Kinetic Energy Budget of a Mediterranean Cyclone |
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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 A diagnostic energetics analysis is used to study the effects of moisture-related processes on a developing cyclone over
the Mediterranean. This is done by using the moist wind component to calculate the energy budget and then the effect due to
wind field changes on the kinetic energy budget is illustrated.
The horizontal flux convergence serves as a major energy budget source in both cases (actual and moist wind), although the
magnitude values of this term are small in the case of the moist wind. Generation of kinetic energy, is generally (in the
case of moist wind), a prominent sink during the life cycle of the cyclone, and its values are greater than the corresponding
ones for the actual wind field except at the decay period. Subgrid-scale sources of kinetic energy provide a substantial energy
gain throughout the life cycle of the cyclone. The values of the dissipation term differ from using the actual or moist components
where its values are influenced by the values of the other terms in the budget. The baroclinic generation due to the divergent
moist wind component offsets by 80.8% and 12.1% for the barotropic destruction of kinetic energy by the rotational moist wind
component. The divergent moist wind component was found to be very important in the synoptic-scale environments of the cyclogenesis.
Both demonstrate that the divergent moist wind component is as important as the rotational moist wind component in producing
generation and horizontal flux divergence of kinetic energy. Generation of kinetic energy by the divergent moist wind component
seems to be a major factor leading to the creation of upper-level wind maxima north of the storm areas. Thus, these diagnostic
findings suggest possible modifications to the wind field by investigating the role of the divergent moist wind component
and may also be fruitful in exploring the effects of cyclogensis on the large-scale environment.
Received April 27, 1998/Revised April 23, 1999 |
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