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علیجانی, بهلول, طولابی نژاد, میثم, کربلائی درئی, علیرضا. (1398). رفتارسنجی اثر گرمایش جهانی بر پُرفشار جنب حاره. , 51(1), 33-50. doi: 10.22059/jphgr.2019.258677.1007223
بهلول علیجانی; میثم طولابی نژاد; علیرضا کربلائی درئی. "رفتارسنجی اثر گرمایش جهانی بر پُرفشار جنب حاره". , 51, 1, 1398, 33-50. doi: 10.22059/jphgr.2019.258677.1007223
علیجانی, بهلول, طولابی نژاد, میثم, کربلائی درئی, علیرضا. (1398). 'رفتارسنجی اثر گرمایش جهانی بر پُرفشار جنب حاره', , 51(1), pp. 33-50. doi: 10.22059/jphgr.2019.258677.1007223
علیجانی, بهلول, طولابی نژاد, میثم, کربلائی درئی, علیرضا. رفتارسنجی اثر گرمایش جهانی بر پُرفشار جنب حاره. , 1398; 51(1): 33-50. doi: 10.22059/jphgr.2019.258677.1007223

رفتارسنجی اثر گرمایش جهانی بر پُرفشار جنب حاره

پژوهش های جغرافیای طبیعی
مقاله 4، دوره 51، شماره 1، فروردین 1398، صفحه 33-50    اصل مقاله (1.39 M)
نوع مقاله: مقاله کامل
شناسه دیجیتال (DOI): 10.22059/jphgr.2019.258677.1007223
نویسندگان
بهلول علیجانی* 1؛ میثم طولابی نژاد2؛ علیرضا کربلائی درئی2
1استاد گروه آب و هواشناسی، دانشگاه خوارزمی، تهران
2دانشجوی دکتری آب و هواشناسی، دانشگاه خوارزمی، تهران
چکیده
این مطالعه با هدف بررسی اثر گرمایش جهانی بر رفتار پُرفشار جنب حاره به‏انجام رسید. بدین‏منظور، از داده‏های حداکثر دمای روزانة 49 ایستگاه سینوپتیک طی 1977 تا 2016 استفاده شد؛ با توجه به روند دماهای بالای صدک 95، سال 1996 مرزِ بین دو دورة قبل و بعد از تشدید گرمایش انتخاب شد. نتایج حاصل از تحلیل‏ها نشان داد در دورة اول مقدار دما به 39.5 درجه رسیده است؛ درحالی‏که در دورة دوم این مقدار به 40.5 درجه رسیده است و فراوانی دماهای آستانه در دورة اول بسیار کمتر از دورة دوم بوده است. به‏ عبارت ‏دیگر، رفتار گرمایش جهانی ثابت شد و فراوانی دماهای بالای 40.5 درجه در بیشتر ایستگاه‏ها فراگیر و به حالت عادی و نرمال درآمد. نتایج تحلیل سینوپتیک نشان داد میانگین بلندمدت ارتفاع هستة پُرفشار جنب حاره طی دورة اول نسبت به دورة دوم افزایشی دَه‏متری داشته است؛ اما میانگین بلندمدت اختلاف ارتفاع هستة پُرفشار جنب حاره در دورة دوم، نسبت به دورة اول، در ماه جولای، در طول 52.5 درجة شرقی به بیش از 100 متر رسیده است. همچنین، نتایج حاصل از رابطة متقابل دما و ارتفاع جو نشان داد که دلیل افزایش ارتفاع هستة پُرفشار جنب حاره افزایش دما در لایه‏های پایین اتمسفر است.
کلیدواژه‌ها
پُرفشار جنب حاره؛ فراوانی حداکثر دما؛ گرمایش جهانی
عنوان مقاله [English]
Investigating the Effects of Global Warming on Subtropical High Pressure
نویسندگان [English]
Bohloul Alijani1؛ Meysam Toulabi Nejad2؛ Alireza Karbalaie Darei2
1Professor of Climatology, Department of Climatology, Kharazmi University, Tehran, Iran
2PhD Candidate in Climatology, Kharazmi University, Tehran, Iran
چکیده [English]
Introduction
Climate change in the recent years has led to changes in atmospheric patterns and the appearance of climatic anomalies in most parts of the world. Earth’s climate is a complex dynamic system that involves hydrosphere, cryosphere, biosphere and lithosphere. If any of these systems are altered, other systems will quickly or slowly align themselves with that and the outcome of this coordination can also affect the system change. Eventually, an endless chain of links is created between these systems. The interaction between these four systems is responsible for the concern of weather and climate scientists in recent years about the "climate change". The result of global warming is climate change. The process of climate change, especially temperature changes, is one of the most important discussions in the field of environmental sciences. Many of the environmental problems, such as floods, storms, droughts, changes in atmospheric patterns, and so on, are rooted in climate change, especially in air temperature rises. The objective of this study is to investigate the effects of global warming on subtropical high pressure behavior.
Materials and methods
In order to investigate the influence of global warming on the subtropical high pressure behavior, the following steps have been taken. In the first step, maximum daily temperature data of 49 synoptic stations during the period from 1977 to 2016 were used to study the frequency of temperature records higher than percentile 95 in each year. Given the frequency of temperature higher than percentile 95, this trend has been dramatically increased in 1996, so this year has been set as the border between the two pre-warming and post-warming periods. In the second stage, given that global warming is expected to increase these extreme temperature, frequency of temperature higher than percentile 95 was investigated in both periods.
In the third stage, the changes in the behavior of subtropical high-pressure in terms of height and spatial extent were determined based on 500-hPa geopotential data, derived from European Center for Medium – Range Weather Forecasts (ECMWF). Finally, to prove the existing relationship between the data, the 500-hPa geopotential height anomalies were plotted over the two periods and analyzed to determine that what changes occured in height of the middle level.
Results and discussion  
The results have indicated that the long-term average of core height of the subtropical high pressure during the second period (1996-1997) is increased by 10 meters relative to the first period (1996-2016). Given the frequency of the thresholds of percentile 95 of the second period, it can be said that most stations have experienced extreme temperatures, so it can be said that global warming has been proven. It can be said that during the current period, a temperature of 40°C is a normal temperature. Therefore, due to the mutual and direct relationship between temperature and height of the atmosphere, it can be said that the reason for increasing the height of the core of the subtropical high pressure is the temperature increase in the lower layers of the atmosphere. The temperature increases in the layers near the earth surface can create thermal low pressure on the land surface and the dynamical high pressure resulted from the subtropical high pressure subsidence and some systems including Monsoon.  This situation for every 1000 meters, while increasing power  increases air temperature by 6˚C. Thus, the core height of the subtropical high pressure is increased and the maximum temperatures are recorded, especially during the warm months. Pearson correlations also indicate a very strong and positive correlation between the core height of the subtropical high pressure and the maximum temperature in both the periods.  
Conclusion
The results of the analysis of the maximum temperature data showed that during the first period, the temperature reached 30.5 ° C in percentile 95 while during the second period with 1˚C increase it reached 40.5˚C. It can be said that in the first period of global warming we did not have much intensity in Iran, but in the second period the temperature reached its maximum and the effect of this warming can be seen in the recorded temperature. In other words, occurrence of global warming has been proven and the frequency of temperatures above 40.5 ˚ C has become prevalent in most stations. Spatial analysis of the core of subtropical high pressure has indicated that its highest level in the first period over Iran is 5910 m which affect fewer stations. But in the second period, the core height of subtropical high pressure is 5940 meters, which, in comparison with the first period, shows an increase in both the height and extent resulted in higher temperature. It was found that the long-term average height of the subtropical high pressure core during the second period (1996-1997) is increased by 10 meters relative to the first period (1996-2016). Given the frequency of the thresholds of percentile 95 of the second period, it can be said that most stations have experienced extreme temperatures, so it can prove global warming. In other words, during the current period, the temperature of 40 degrees is a normal temperature. The results of the direct and indirect correlation between temperature and elevation of the atmosphere showed that the increase in the height of the adjacent high pressure core is a rise in temperature in the lower layers of the atmosphere. 
کلیدواژه‌ها [English]
tropical high pressure, frequency, maximum temperature, Global warming
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