تحليل ظاهرة الصقيع واحتمال حدوثها في جنوب سورية

الموضوعات

علوم بيئية

روابط وملفات

التعريف والنوع

رقم الوثيقة

0e7d3fea-cb08-4c2c-a754-e0de51fd827c

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1966813_1.pdf

بيانات النشر

ترجمة العنوان

Analysis the phenomenon of frost and probability of occurrence in the south of Syria

ألقاب المؤلفين

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اللغة

Arabic

المصدر والدورية

اسم المصدر

تحليل ظاهرة الصقيع واحتمال حدوثها في جنوب سورية

المحتوى والصفحات

عدد الصفحات

134

ترجمة الملخص

This research has been carried out on six climatic stations including: Damascus, Daraa , Alswaidaa, Alqonaitera, southern Ain Alarab and Sargaya to analyzefrost phenomenon in the southern region. minimum temperature was used to a period of 30 years and data were analyzed to find the lowest monthly and yearly recorded minimum temperature and arrange it ascending to draw charts indicating severity and time of frost.Frost distribution was studied by calculating days where temperature decreased under zero in winter, spring and autumn and charts were drawn to show Linear Regression of these days. Number of days where frost occurs was calculated with determined thresholds (0, -2, -4 and less than 4هC). Autumn, spring and winter waves were monitored by considering temperature dropping under zero for three days as frost wave.Probability of first and last frost occurrence was studied and Linear Regression charts of winter, spring and autumn cold nights value indicator was drawn which express the very extreme value of minimum temperature.Results of studying frost phenomenon in this region showed that temperatures hasn't dropped under zero in September, October and April in Daraa, Swaidaa, Alqonaiteraand frost rarely occurs during this months in Damascus while frost was common in winter, spring and autumn in Ain Alarab and Sargayaexcept of September.This Study showed that winter frost extends discontinuously in December, January and February, 84 frost days were recorded in 1983 and the lowest minimum temperatures was -17هC in Sargayaand -14هC in Ain Alarab in 1997. Spring Frost is the most dangerous on fruit trees and agriculture in general and its occurrence repetition leads to death of most flowers. The longest spring frost period was recorded in Sargaya for 34 days in 1992 where temperature decreased to -9.5هC in March, where autumn frost considered to be less danger and started to occur in October and leads to the death of all foliar vegetables and its expensive prices. The longest autamn frost period was recorded in Sargaya in 1987 where temperature decreased to -6هCfor 26 days.Results of frost severity showed that its danger is low in the lowest height areas like Daraa, where number of days that temperature decreased below -4هC in winter were 13 days in all the studied period, In Sargaya, frost severity was high and the number of days where temperature decreased below -4هCin winter were (81, 89 and 734) winter, spring and autumn daysrespectively in 30 years. Increase of winter frost wave length was noticed in all stations, the average of the longer winter frost wave in Sargaya was 23days in 1989, and average of the shorter winter frost wave was 23 days in 1994 in the same station, while decrease in spring frost wave length was noticed in all stations where average of the longer spring frost wave in Ain Alarab was 15 days in 1992.Study of probability of first and last frost confirmed that frost occurrence in southern region of Syria begins firstly on mountains (Ain Alarab and Sargaya) and its danger starts from November and then extends to other regions, while the end of frost delays in mountains and dry internal regions till the middle of March.Study of probability of first and last frost incorporated in determining the unfrosted period during the year, it was 267 days in Alswaidaaand 180 days in Sargaya.Increase in this period length was noticed and decrease in cold nights index values (percentile 10) especially in spring as a result to climate change and to the increase in minimum temperature in Syria.

إشراف وإعداد

الإشراف

رجاء الصالح

الإعداد

سمراء بيطار

الاقتباسات الببليوغرافية