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جهانبخش اصل, سعید, محمدی, غلام حسن, خجسته غلامی, وحید, آزاده قره باغ, اسما. (1399). اثرات نوسانات شبه‏ دوسالانه بر بارش ‏های زمستانه ایران. , 52(1), 113-127. doi: 10.22059/jphgr.2020.287400.1007433
سعید جهانبخش اصل; غلام حسن محمدی; وحید خجسته غلامی; اسما آزاده قره باغ. "اثرات نوسانات شبه‏ دوسالانه بر بارش ‏های زمستانه ایران". , 52, 1, 1399, 113-127. doi: 10.22059/jphgr.2020.287400.1007433
جهانبخش اصل, سعید, محمدی, غلام حسن, خجسته غلامی, وحید, آزاده قره باغ, اسما. (1399). 'اثرات نوسانات شبه‏ دوسالانه بر بارش ‏های زمستانه ایران', , 52(1), pp. 113-127. doi: 10.22059/jphgr.2020.287400.1007433
جهانبخش اصل, سعید, محمدی, غلام حسن, خجسته غلامی, وحید, آزاده قره باغ, اسما. اثرات نوسانات شبه‏ دوسالانه بر بارش ‏های زمستانه ایران. , 1399; 52(1): 113-127. doi: 10.22059/jphgr.2020.287400.1007433

اثرات نوسانات شبه‏ دوسالانه بر بارش ‏های زمستانه ایران

پژوهش های جغرافیای طبیعی
مقاله 8، دوره 52، شماره 1، فروردین 1399، صفحه 113-127    اصل مقاله (1.22 M)
نوع مقاله: مقاله کامل
شناسه دیجیتال (DOI): 10.22059/jphgr.2020.287400.1007433
نویسندگان
سعید جهانبخش اصل* 1؛ غلام حسن محمدی2؛ وحید خجسته غلامی3؛ اسما آزاده قره باغ4
1استاد گروه آب و هواشناسی دانشگاه تبریز
2دکتری آب و هواشناسی، سازمان هواشناسی کشور، ادارة کل هواشناسی آذربایجان شرقی
3دانشجوی دکتری آب و هواشناسی، دانشگاه محقق اردبیلی
4دانشجوی کارشناسی ارشد آب و هواشناسی، دانشگاه تبریز
چکیده
هدف اصلی از این مطالعه تشخیص نقش دورپیوند QBO بر بارش‏های فصل زمستان در ایران است. بدین منظور، از داده‏های بارش صد ایستگاه هواشناسی در دورة آماری ۱۹۸۸-2017 استفاده شد و با اعمال چند روش آماری و توصیفی نقش QBO بر بارش‏های فصل زمستان بررسی شد. با انتقال خروجی‏ها به محیط سامانة اطلاعات جغرافیایی (GIS)، پهنه‏های مختلف اثرپذیر از QBO مشخص شد. نتایج یافته‏های پژوهش حاکی از آن است که ارتباط معکوس و معنی‏داری بین فازهای مثبت QBO در فصل پاییز و بارش‏های فصل زمستان در نواحی مرکزی و جنوبی ایران وجود دارد؛ به‏طوری‏که بیشترین ضرایب همبستگی بین 6/0- تا 86/0- در سواحل جنوبی خلیج فارس مشاهده‏شدنی است. نتیجة مهم دیگر این پژوهش آشکارسازی نقش فازهای فرین منفی بر کاهش بارش‏های فصل زمستان است. به‏طورکلی، به‏نظر می‏رسد فازهای ملایم QBO نقش مساعدی در ترسالی‏های اغلب مناطق کشور داشته و به هنگام رخداد فازهای منفی حدی غالباً زمستان‏های خشک در بیشتر نقاط کشور رخ داده است. همچنین، وقوع فرین‏های مثبت و به‏ویژه منفی نمایة QBO به‏ترتیب در فصول پاییز و زمستان یکی از علل خشک‏سالی‏های زمستانه در مناطق جنوبی و غربی ایران بوده است.
 
کلیدواژه‌ها
ایران؛ بارش زمستانه؛ دورپیوند؛ نوسان شبه‏دوسالانه (QBO)
عنوان مقاله [English]
The Effects of Quasi-Biannial Oscillations on Iran Winter Precipitation
نویسندگان [English]
Saeed Jahanbaksh Asl1؛ Gholam Hasan Mohammadi2؛ Vahid Khojasteh Gholami3؛ Asma Azadeh Garebagh4
1Professor, Department of Climatology, Faculty of Planning and Environmental Sciences, University of Tabriz, Iran
2PhD in Climatology, Iran Meteorological Organization, East Azarbijan Province Central Bureau, Tabriz, Iran
3PhD Candidate in Climatology, Department of Physical Geography, Faculty of Literature and Humanities, University of Mohagegh Ardabili, Ardebil, Iran
4Msc. Student in Climatology, Faculty of Planning and Environmental Sciences, University of Tabriz, Tabriz, Iran
چکیده [English]
Introduction
Precipitation is resulted from a complex atmospheric and oceanic phenomenon and among other climatic events it has a special importance for the vital role it can play in environment and any human activity. Iran is located in the world's arid and semi-arid belt and receives more than half of its annual rainfall in the winter. Teleconnection is the alternating and continuous anomalies of atmospheric patterns and particularly pressure on the planetary scales with relative prolonged return period. Therefore, it can be considered as one of the key elements on climatic forecasts. Quasi-Biennial Oscillation (QBO), recognized in 1961,is one of the main oscillations on the planetary scale in the stratosphere layer with a mean return period of 26 months and is also one of the main components of short-term fluctuations in the climate. QBO can vary the surface weather with effect on polar atmospheric patterns. It can also affect the amount of ozone depletion on high geographical latitudes, in addition to the effect on solar cycle and connection with other teleconnections such as ENSO resulting in the climate change of the earth.
Material and methods
The total monthly precipitation from 100 synoptic stations from Iranian Meteorological Organization and QBO index data of National Oceanic and Atmospheric Administration (NOAA) during 1988-2017 were applyed as the basic input data of the study. First, rainfalls from December to February were considered as winter precipitation for the corresponding QBO index. Then, precipitation data were standardized in order to make comparable data with QBO. The normalized data of winter rainfall as dependent variable and QBO index as independent variable were entered into the STATSTICA software. Pearson correlation coefficients were performed between them in each station. No simultaneous effect may be observed due to long distance between QBO generation areas and Iran, therefore, a three months lack also was tested, and hence, the correlation coefficients were calculated between autumn QBO and winter precipitation of the stations. In order to validate of correlation coefficients, precipitation difference of the stations in the positive phases of QBO compared with negative phases. In the next step, the correlation coefficients outputs entered into the GIS environment and mentioned maps were drawn using IDW approach. Finally, the trend chart of the winter precipitation anomaly was prepared to study the impacts of autumn and winter QBO on.
Result and discussion
The results showed that there is a significant inverse relationship between the positive phases of autumn QBO with winter rainfall in most stations, especially in the central and southern parts of Iran. The increase in the intensity of the positive phases in autumn QBO causes subnormal winter rainfall in the central and southern parts of the country. On the other hand, the occurrence of negative autumn QBO causes a minor increase in the rainfall rates of most parts of Iran. However, the occurrence of rainy winter in the case of autumn negative phases is not conclusive. But, the winter time extreme negative phases of QBO index lead to a significant decrease in the precipitation rates of most areas of the country especially southern and western parts, while the positive phases lead to minor decrease (increase) in the precipitation rates of the southern (northern)parts of Iran. The separate study of positive and negative phases of QBO in autumn and winter seasons revealed a contradictory effect on winter rainfalls in different parts of Iran, and in short, the effect of QBO on winter precipitation is lower in northern parts. The final results showed that the occurrence of rainy winter has been linked to the mild phases of QBO index in the autumn and winter. It can be concluded that the QBO teleconnection is one of the main factors controlling winter precipitation in different parts of the country, especially in the southern, central and western sectors. The main and tangible role of QBO is a reduction in the amount of precipitation. Meanwhile, there is no significant relationship between QBO index and winter precipitation in the northern parts of Iran, especially the northwest and Caspian Sea coasts.
Conclusion
In general, the correlation between the autumn and winter QBO index and winter precipitation is negative in the western half and positive in the eastern and southern parts of the country. Thus, by moving from the extreme negative values of QBO to the positive ones, a relative partial reduction is observed in the precipitation rate of northwest regions, western sides of Alborz Mountains and the western parts, respectively. There is an increase in other parts especially in the Caspian Sea coasts and the southern Iran. The autumn phases of QBO index are slightly more related to winter precipitation. Unlike the previous condition, there is a negative correlation between the positive phases of QBO and winter precipitation rates. This is more significant in most regions especially in central and southern parts of Iran. The highest correlation coefficient (-0.65 to -0.82) was observed on the shores of the Persian Gulf and the positive phases of this index happened to decrease the precipitation rates in the central and southern regions of Iran. There is no significant relationship between the negative phases of autumn QBO and winter precipitation rates. On the other hand, positive phases of winter QBO can reduce precipitation rate in south and southwest regions and partially increased rainfalls in the northwest of Iran. However, the amount of rainfall decrement is more significant in the southern regions. Also, the occurrence of negative phases in the winter reduced the precipitation rate in most parts especially in the western parts, the coast of Persian Gulf and some parts of the eastern Iran. The occurrence of rainy winter has always been linked to the gentle phases of QBO index and it has not been associated with strong positive and negative phases. It seems that the extreme positive phases in autumn and the extreme negative phases in winter time have more significant effects on the reduction of rainfall in most parts of Iran especially in southern regions.
کلیدواژه‌ها [English]
Teleconnection, QBO, winter precipitation, correlation coefficient, Iran
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