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Register a new userAnalysis of Seasonal and Annual Variations in Surface Air Temperature in Syria
تحليل التغيرات الفصلية و السنوية لدرجة حرارة الهواء السطحية في سورية
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تناولت هذه الدراسة التغيرات الفصلية و السنوية في درجة حرارة الهواء الـسطحية فـي سـورية، اعتماداً على معطيات درجة الحرارة لاثنتي عشرة محطة مناخية من مختلف مناطق سورية. أجري تحليل الانحدار لدرجة حرارة الهواء باستخدام طريقتي المربعات الصغرى و فلاتر المعـدلات المتحركـة حـسب Gaussian Low Pass Filter طريقة أجري تحليل الدورية للمتوسطات السنوية لدرجة الحـرارة باسـتخدام تحـولات فورييـه الـسريعة Transformations Fourier Fast بينت نتائج الانحدار الخطي للمتوسطات الفصلية و السنوية لدرجـة الحرارة أنه كان إيجابياً في جميع المحطات باستثناء اللاذقية. أظهرت نتائج تحليل التقلبات في المتوسطات الفصلية و السنوية لدرجة الحرارة، أن هناك بداية مهمة لفترة دفء في جميع المحطات، بدءاً من عامي 1993 ، 1994 بالنسبة للمتوسطات الـسنوية و متوسـط حرارة الشتاء في حين كانت المتوسطات الفصلية في الخريف و الصيف و الربيع أعلى من المعـدل خـلال فترة الدراسة. تتأثر درجة حرارة الهواء السطحية بدورة البقع الشمسية، و ظاهرة الذبذبة شـبه الثنائيـة و ظـاهرة ENSO.
This study is concerned with the variations in annual and seasonal surface air temperature in Syria, depending on the data from 12 different meteorological stations in Syria. The analysis of surface temperature trends was performed using Least squares (linear regression) and Moving- averaging filters according to Gaussian low- pass filter. Fast Fourier Transformation was used for the analysis of periodicity for the annual mean surface temperature. The results of linear regression showed that the general trend of annual and seasonal temperature in all stations was positive except Latakya. The results of annual and seasonal temperature, fluctuations revealed the existence of important warming period in all stations starting from 1993-1994 for the average of annual and winter temperature while summer, autumn and spring temperatures averages were above the mean during the study period. Periodicities analysis showed that the surface air temperature seems to be affected by solar cycle and quasi- biennial oscillation as well as the El-nino southern oscillation.
References used
Aesawy, A. M. and H.M.Hasanean., 1997. Annual and seasonal climatic analysis of surface air temperature variation at six southern Mediterranean stations.Thero.Appl. Climatol., 61,55-68
Arnell,N.W.and Reynard,N.S.1993. Impacts of Climate Change on River Flow Regimes in the United Kingdom.Institute of Hydrology, NERC, Water Directorat DOE,july 1993.130p
Arseni-Papadiomitriou, A., P. Maheras , 1991. Some statistical characteristics of air temperature variation. Theor. Appl. Climatol., 43,105-112
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absorption of CO2 from the water.These leading to a decrease PCO2
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