fa نقش تغییر اقلیم در جابجایی فصول اقلیمی ایران اب و هواشناسی climatology كاربردي Applicable <span dir="LTR"></span> <div style="text-align: justify;">هدف این مطالعه بررسی تغییرات و جابه&shy;جایی&shy;های احتمالی در فصول اقلیمی ایران با توجه به تغییر اقلیم است<span dir="LTR">.</span> داده&shy;های دما، رطوبت&shy; نسبی، فشار بخار آب، باد و ابرناکی برای 36 ایستگاه، طی 40 سال از سازمان هواشناسی دریافت شد. داده&shy;ها به دو سری 20 ساله تقسیم شدند تا امکان مقایسه فراهم شود. داده&shy;های روزانه دمای هر سری زمانی با نرم افزار <span dir="LTR">Spss</span> خوشه&shy; بندی، سپس با در نظر گرفتن توالی&shy;های 7 روزه، آغاز و پایان فصول مشخص شد. زمان&shy;های تعیین شده از طریق مدل ریمن مورد آزمون قرار گرفت. نتایج حاصل از مقایسه فصول در دو سری زمانی حاکی از آن بود که در تمامی ایستگاه&shy;ها تغییرات در فصول اقلیمی از ناچیز تا چشم&shy;گیر رخ داده است. فصول طبیعی در ایران با فصول تقویمی تطابق ندارد و تغییرات اقلیمی بویژه تغییر دما طی دهه&shy; های اخیر باعث جابه &shy;جایی و کوتاه و بلند شدن فصل&shy;ها شده است. با وجود&nbsp; اینکه آغاز و پایان فصل&shy;ها به طور کلی با تاریخ&shy;های تقویمی آنها مطابقت ندارد، اما عمده روزهای این فصل&shy;ها در دوره&shy;های تقویمی آن رخ می&shy;دهند. تغییرات رخ داده تنها بر روی طول فصول تاثیر نداشته و این جابه&shy; جایی&shy; ها باعث تغییر در کیفیت فصول اقلیمی نیز شده است.</div> &nbsp; <div style="text-align: justify;">In this research, we are trying to determine the &ldquo;beginning time&rdquo; as well as the &ldquo;end&rdquo; of the climatic seasons; and we will focus on identifying the displacement of these dates, which is influenced by the &ldquo;climate changes&rdquo; and &ldquo;description<strong><span dir="LTR">Abstract</span></strong><br> The purpose of this study is to investigate possible changes and displacements in Iran&#39;s climatic seasons due to climate change. To do this, temperature, relative humidity, water vapor, wind and cloud data for 36 stations were received from the Meteorological Agency over 40 years. The data were divided into two 20-year series to allow comparison. Daily temperature data for each clustering time series were determined, then by considering 7-day sequences, the beginning and end of the seasons. The designated times were tested using the Rayman model. The results of comparing the seasons in the two time series indicated that in all stations, changes in climatic seasons occurred from Insignificant to significant. Climatic seasons in Iran do not correspond to calendar seasons, and climate change, especially temperature changes in recent decades, has caused the seasons to shift and shorten and lengthen. Although the beginning and end of the seasons do not generally correspond to their calendar dates, most of the days of these seasons occur in its calendar periods. The changes that have taken place have not only affected the length of the seasons, and these shifts have also changed the quality of the natural seasons.<br> <strong>Keywords</strong><strong><span dir="RTL">:</span></strong> Climate change, natural seasons, cluster analysis, Rayman model of the qualitative conditions&rdquo; created in them, compared to the past climatic periods. &ldquo;Meteorological Organization&rdquo; data has been used in this research. Forty years of received data, was divided into two groups of 20. Applying SPSS, each group was divided into four stages representing each seasons. From these stages, the beginning time and the end of seasons were determined and the accuracy of the obtained dates was controlled with the comfort indicators of the Rayman model. The results of the comparison of seasons in two time series indicated that, the changes occurred in natural seasons from an almost non-existent one in all stations. Climatic&nbsp;seasons in Iran are not compatible with the summer season and climate change, especially the change in temperature in recent decades, has caused changes and shortening of seasons. Most of the days in these seasons occur during its monthly periods, although the beginning and end of the seasons generally do not match their calendar dates. Changes have not only affected the duration of the season, and these changes have also led to a change in the natural quality of the season.</div> واژگان کلیدی:تغییر اقلیم, فصول اقلیمی, تحلیل خوشه­ ای, مدل ریمن Climate change, Climatic seasons, Cluster analysis, Rayman model 1 16 http://jgs.khu.ac.ir/browse.php?a_code=A-10-3505-2&slc_lang=fa&sid=1 mahnaz Aziz Ebrahim مهناز عزیز ابراهیم mahnazazizebrahim@yahoo.com 100319475328460016096 100319475328460016096 No ph.D. Student of synoptic climatology دانشجوی دکتری آب و هواشناسی سینوپتیک، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران Mohammad Saligheh محمد سلیقه saligheh@khu.ac.ir 100319475328460016097 100319475328460016097 No Associate Professor of climatology, university of kharazmi دانشیار آب وهواشناسی، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران Mohammad hossein Nassrzadeh محمد حسین ناصرزاده nasserzadeh2100@yahoo.com 100319475328460016098 100319475328460016098 Yes Assistant Professor of climatology, kharazmi University, Tehran, Iran . استادیار اقلیم شناسی دانشگاه خوارزمی تهران Bohlol Alijani بهلول علیجانی bralijani@gmail.com 100319475328460016099 100319475328460016099 No Professor of climatology, kharazmi University, Tehran, Iran . استاد اقلیم شناسی دانشگاه خوارزمی تهران