Document Details

Document Type : Thesis 
Document Title :
Diagnostic study of Diabatic Heating in Relation to Kinetic Budget
قبول الرسالة مع اجراء بعض التعديلات - خلال الفترة الممنوحة للطالب
 
Subject : Faculty of Meteorology, Environment and Arid Land Agriculture 
Document Language : Arabic 
Abstract : Calculations of the diabatic heating for a developing winter-type cyclone are presented. This case represents a middle latitude cyclone that is developed significantly north of the Mediterranean Sea. Analysis have been made using the thermodynamic equation in isobaric coordinates. The horizontal advection of heat is the dominant term during the life cycle of the cyclone. The diabatic cooling is strongly associated with the cold air advected to the computational domain. Throughout the period of study the vertical advection term is working against the adiabatic one. The contributions from the term of local temperature change to the diabatic heating changes are very small with respect to all the other terms, the maximum local increase of temperature occurs at the boundary layer on the rainy day. The existence of Mediterranean, Red sea and red sea mountains suggest that the diabatic heating in the lower layer at the rainy day is primarily due to latent heat release of condensation. The intensification and movement of the heating and cooling areas coincide with the developing and movement of the cyclone. Analysis of the kinetic energy budget for this cyclone shows the development occurred as cold fresh air is advected to the rear of the system. The role of the polar and subtropical jets is discussed. It is found that horizontal flux convergence constitutes the major energy source and is the main cause for maintaining the strength of the upper tropospheric jet maxima. Generation of kinetic energy via cross-contour flow is a persistent sink at the most days. Dissipation of kinetic energy, computed as a residual, has local maxima both in the lower troposphere and near the jet stream level. Spatial fields of the energy terms show that the specify energy processes occur in association with deep cyclogenesis. The vertical transfer of kinetic energy acts as a source of kinetic energy to middle troposphere and lower stratosphere. By comparing the diabatc heating and the generation of kinetic energy we find the movement of the heating or cooling pattern is strongly associated with the movement of positive or negative generation and also with the movement of the cyclone. The diabatic cooling associated with the conversion of kinetic energy to potential energy (destruction of kinetic energy) in the lift side of the upper air trough and diabatic heating associated with generation of kinetic energy in the right side of the upper air trough. 
Supervisor : dr. 
Thesis Type : Master Thesis 
Publishing Year : 1430 AH
2009 AD 
Co-Supervisor : dr. 
Added Date : Monday, December 28, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
محمد أحمد العمريALOMARY, MOHAMMED AHMEDResearcherMaster 

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