Share
تكرار المنخفضات الجوية واثرها في طقس العراق ومناخه == The Impact Of Depressions Frequency On Iraqi Weather And Climate
Author name:
كاظم عبد الوهاب حسن الاسدي
Supervisor name:
عبد الاله رزوقي احمد كربل
General topic:
Geography
Specific topic:
Geography
Degree:
Master
University:
University Of Basrah - College Of Literature - Department Of Geography
Language:
Arabic
University location:
Basrah
First pages:
10T1450 - p.pdf
Abstract:
The research intends to study the sequence of depression passing through the country generally, with eiuphysis on the Mediterranean depressions, The analys~s of the surface weather maps to the frontal depressions reveal the impoctrthnce of the Sudanese and he Fused depressions due to the transformation of some of the thermal depressions in Sudan into frontal depression or, its Fusion with one of the Mediterranean depressions. All kinds of depression that pass through Iraq durin the season of the passage of frontal Mediterranean depressions starts from October till end of May are eua.miP,ed We call this period as season of passage of frontal depres ion.May is excluded from the study because the researcher is not able to acquire the information needed.To study the sequence of cyclone "depression" and its climatic effects, choose eleven seasons "small clim$.ti cycle" starting from season of 1978/1979 and ending with season 1988/1989. Make this choice due to the availabilit of data and maps in Iraq and the adjoining Arab countri~s ( Saudi Arabia and Kuwait).To analyse this topic, the researcher depends on surface and upper climatic maps. Also he depends on hourly, daily and climatic data and on monthly climatic' reports. In addition, depends on Library references, t~ugA they are few. The researcher uses statistical pr•cedures to analyse the data and to find the power of relation among the variables, especially the correlation <X>effioient and standard degree.'!he me.in e.im of this research is the study of the frequency of the depression that passes through Iraq in the cold period which concentrates on the mid latitude frontal depressions and its impact on the weather and the climate of the country.In the First Chapter the characteristics of the depression and their relation with air masses.In the same time the chapter discusses the relation between the depression and the movement of the air at the upper layers of the atmosphere, then the study focuses on the origin of the depressions that influence the weathef' and climate of Iraq.In the Second Cwpter we find the.t the mid latitude : frontal depression oomposes the majority of the depressior that pass through Iraq, then the fused depressions and. finally the Sudanese one.~he researcher analysis all weather phenomeXJB. and their relation with depressions, especially the fronts. So we found that there were little differentations fromone station to another or from one depression to another. This work will be done in the third chapter of the thesi~.In the Fourth Chapter the researcher makes certain : elations between the depressions and climatic features in Iraq such as (temperature, wind and precipitation ) ~ rhe researcher thi : okS that there are some close relations among them.We can sunJlllS.rize the results attached by the researcher as follows : l. The weather is unstable through the cold period of the year as a result of the passing of many different masses and depressions.2. Through the cold period, the country is influenced by uany mid latitude frontal depressions (Fused and Mediterranean), Sudan, thermal and monsoon depressiorls of India and Arab peninsula.3. The frequency of M.L.F.D. is increased to the north of La.t. : ;o0 N while the Fused depressions are covering a.11 area of Iraq. At the same time Sudan depressioll#il are restricted as a whole ill the southern part of tije country.4• The determination of movement direction and speed of frontal depressions are influenced by roa : oy factors which control them.5. The weather was unstable through the cold period as a result of passing many leinds of depressions througl : l one or more days. Especially ~hen a Fused depress~on errossing the country. The responsibility on the occurrance of cold waves belongsto M.L.F.D., while hot waves belongs to Sudan depression. The passing of depressions makes short variations in the speed and direction of the wind. 7. The occurranceof dust and dust storms belong to the frequency of Kha.main frontal depressions l!'used and Sudan depressions. While Fog accompanies most of the 14.L.F.D.8. Most of the precipitation on the country is a result of the frequency of M.L.F.D. The precipitation is due to the cold front in the northe= part of Iraq and the warm front in the southern part and both of them in the middle.9. There are many factors that impact the temperature such s, Lattitude degree, altitude, and distance from seas.10. As a result of the increase in the frequency of the Fused and M.L.F.D. in the north and the Sudan depression in the south the temperature is decrease , 11. The increase in the frequency of thermal and Khamsin depressions caused an increase in the temperature throu12. In the seasons that many Sudan thermal and Khamsin depressions occur, dust and dust storms occur too. The frequency of rainydays related to the frequency of M.L.F.D. The later responded to the increase in precipitations in the north.14. Most thunderstorms in Iraq are a direct or indirect result of frequency of M.L.F.D
