| تعداد نشریات | 285 |
| تعداد نشریات سازمان | 83 |
| تعداد شمارهها | 3,110 |
| تعداد مقالات | 34,666 |
| تعداد مشاهده مقاله | 49,824,783 |
| تعداد دریافت فایل اصل مقاله | 80,170,613 |
واکاوی فراوانی رخدادهای گردوغبار و بارش همزمان در جنوبغربی ایران | ||
| تحقیقات مرتع و بیابان ایران | ||
| مقاله 7، دوره 25، شماره 4، بهمن 1397، صفحه 770-788 اصل مقاله (1 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijrdr.2019.118612 | ||
| نویسندگان | ||
| طاهره انصافی مقدم* 1؛ فرامرز خوش اخلاق2؛ علی اکبر شمسی پور2؛ رضا اخوان3؛ طاهر صفرراد4؛ فرشاد امیر اصلانی5 | ||
| 1مربی پژوهش، بخش تحقیقات بیابان، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| 2دانشیار، گروه جغرافیای طبیعی، دانشکده جغرافیا، دانشگاه تهران | ||
| 3دانشیار، بخش تحقیقات جنگل، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| 4استادیار، اقلیمشناسی، گروه جغرافیا و برنامهریزی شهری، دانشکده علوم انسانی و اجتماعی، دانشگاه مازندران | ||
| 5دانشیار، گروه سنجش از راه دور و GIS، دانشکده جغرافیا، دانشگاه تهران | ||
| چکیده | ||
| تجزیهوتحلیل سریهای زمانی پارامترهای اقلیمی، راهکارهای جدیدی را در تحلیل فراوانی منطقهای و برآورد روابط متغیرهای اقلیمی فراهم کرده است. در این مقاله، پردازش ویژگیهای رقومی برای تعیین طول دوره چرخه روزانه گردوغبار و بارش در 12 ماه سال بهکار برده شد تا با استفاده از پریودوگرام های همبستگی و تحلیل سری زمانی روزانه دو متغیر یادشده استفاده شود. برای تحقق این هدف سری زمانی دو متغیر فراوانی گردوغبار و میزان بارش براساس دوره مشترک آماری بلندمدت (2016-1986) در مورد 45 ایستگاه سینوپتیک واقع در جنوبغربی ایران بررسی شد. بهمنظور درک رابطه همبستگی، ابتدا نمودار تغییرات روزانه چرخههای گردوغبار و بارش در هر ماه از سال بهطور جداگانه نمایش داده شد. سپس برای اطمینان از نرمال بودن آمار، دادهها با استفاده از آزمون آماری کولموگراف- اسمیرنوف بوسیله نرمافزار SPSS آزمایش گردید. نتایج آزمون نشان داد که کلیه دادههای پارامترهای مورد نظر نرمال بودند. نتایج حاصل از محاسبه ضرایب همبستگی در 12 ماه سال پیرسون بیانگر معنیدار بودن همبستگی دادهها در سطح یک درصد است. نتایج بدستآمده مبتنی بر این یافته است که در منطقه مورد بررسی عمدتا در ماههای سرد سال (ژانویه، فوریه، مارس، آوریل، می، نوامبر و دسامبر) رابطه همبستگی معنیدار در سطح اعتماد 95% و 99% وجود دارد و در پنج ماه دوره گرم (ژوئن، ژوئیه، اوت، سپتامبر و اکتبر) همبستگی معنیدار مشاهده نمیشود. همچنین این تحقیق نشان داد که رابطه مقدار فراوانی رخدادهای گردوغبار با مقادیر بارندگی روزانه در منطقه مورد بررسی رابطهای منفی است و این امر نشان میدهد که گردوغبار میتواند بهطور قابل توجهی بهعنوان عامل کاهنده یا سرکوب کننده میزان بارندگی در منطقه عمل کند. | ||
| کلیدواژهها | ||
| تحلیل روند؛ جنوبغربی ایران؛ فراوانی گردوغبار و بارش روزانه؛ روابط همبستگی؛ سری زمانی | ||
| عنوان مقاله [English] | ||
| Analysis of Simultaneous dustfall and rainfall events frequency in southwest of Iran | ||
| نویسندگان [English] | ||
| Tahereh Ensafi Moghaddam1؛ Faramarz Khoshakhlagh2؛ Aliakbar Shamsipour2؛ Reza Akhavan3؛ Taher Safarrad4؛ Farshad Amiraslani5 | ||
| 1Research Instructor, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran | ||
| 2Associate Prof., Faculty of Geography, Department of Climatology , University of Tehran , Iran. | ||
| 3Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran | ||
| 4Associate Prof., Faculty of Geography, Academic Rank-:Assistant Professor of Climatology,Department of Geography and Urban Planning,Faculty of Humanities and Social Sciences, Mazandaran University. | ||
| 5Associate Prof., Faculty of Geography, Department of Remote Sensing and GIS, University of Tehran , Iran | ||
| چکیده [English] | ||
| This paper was carried out to determine the cycle of dust storm in relation with precipitation in 12 months of the year, using processing of digital time series and their correlation with two variables mentioned above. Hence to accomplish the aim of the paper, the frequency of time series for dust storm and rainfall have been analyzed for the long time statistical data collected from 45 synoptic stations(1986-2016), located in the south east of Iran. In order to understand whether or not any correlation with these two variables, firstly a diagram of the daily changes in dust storm and rainfall cycles was drawn for each month separately. Then, to make sure that the statistics data are normal, the data were analyzed using Kolmogorov-Smirnov test in SPSS software. The results of data normality showed that all statistical data of the parameters used in this research were normal. The results of calculating the correlation coefficients of each month during the course of thirty years, indicated that the correlation of data are significant at (P<0.01 & P<0.05) only in the cold months of the year (January, February, March, April, May, November and December). Also, this study showed that the relationship between the amounts of daily precipitation with an abundance of dust events in the area was negative, and this indicates that the dust could be significantly as reducer or repressive downpours in the region. | ||
| کلیدواژهها [English] | ||
| Daily rain and dust frequency, temporal variability, trend analysis, southwestern of Iran, time series | ||
| مراجع | ||
|
- Alijani, B. , 2004. Climate of Iran, Tehran, Payame Noor University. - Ansari, H. and Davari, K., 2008. Dry period zoning using standardized precipitation index in GIS environment. Geographical Research, 60: 97-108 (In Persian). - Asakerh, H., 2007. Temporal-spatial variability of precipitation during recent decades, Journal of geography and development, no:1, Autumn & winter 2007, volume 5, serial 10; page:145-164. - Blazczyk, K.W., Wicz, L., Kunerf, W. and Labedzki, A., 2005. Mulfi-annual flucfuations precipitation and their hydro,logical consequences in regional scale؛Proceedings of symposium s6 held during the seventh IAHS Scientific Assemply at Foz do Iguacu,Brazil. - Boheiraee, H., Ayazi, M. H. , Rajaee, M. A. , Ahmadi, H. , 2011. Synoptic Statistical Analysis of Dust phenomena in Ilam Province, Quarterly Journal of Human Geography,4(1), page: 47-62. - Davoodi Rad, A., Telvari, A. and ٍErfanian, M., 2007. The pattern of time distribution of precipitation in Salt Lake Basin, journal of research and reconstruction on the natural resources, issue, issue 74. - Ekhtesasi, M. and Jahanbakhshi, F., 2016. Models and Tools for Estimating and Measuring Wind Erosion and Dust Storms,Yazd University. - Ensafi Moghaddam T., 2018. Analysis of dust occuarrance effects on precipitation changes in South-West of Iran, A Thesis for Recipt Degree of PHD In Physical Geography-Climatology, Winter 2018, Department of physical Geography, University of Tehran (In Persian). - Fattahi, E. , Ghannad, H., 2010. An analysis of synoptic patterns of dust storms in the south Western region of Iran, Quarterly Scientific Journal of geography, Page: 49-63. - Ghahraman, B. and Taghvaeian. S., 2008. Investigation of annual rainfall trends in Iran. Journal of Agricultural Science and Technology, 10: 93-97. - Hejam, S., khoshkhoo,Y., and Vandi, Sh., 2008. Trend analysis of seasonal and annual precipitation changes in few selected stations in Central Basin of Iran with non-parametric methods, geographical researchs, issue 64. - Hui, W. J.; Cook, B. I.; Ravi, S.; Fuentes, J. D.; D'Odorico, P., 2008.Water Resources Research, Volume 44, Issue 5, CiteID W05202 (WRR Homepage) - Jahanbakhsh, S. ,Torabi, S. , 2004. Evaluation and prediction of temperature and precipitation changes in Iran, geographical research journal, autumn, 1383, volume 19, number 3 (74 consecutive); page: 104-125. - Jirak, I. L., Cotton, W. R., and , Woodley W. L., 2006. EFFECT OF AIR POLLUTION ON PRECIPITATION ALONG THE FRONT RANGE OF THE ROCKY MOUNTAINS, American Meteorological Society ,(AMS), Privacy Policy and Disclaimer, Allen Press, Inc. assists in the publication of AMS journals,Technology Partner Atypon Systems, Inc. - Khorshiddoost, A., and Ghavidel Rahimi,Y., 2004. The study of rainfall fluctuations, forecasting and determining of the wet and dry seasons in East Azarbaijan province in winter, Geographical researches quarterly, issue 72. - Kok, J. F.; Parteli, E. J. R. ; Michaels, T. I.; Karam, D. B., 2012. The Physics of Wind-blown Sand and dust, translated in Persian by: Ekhtesasi, M. ,Ghaeminia, A. ,Reports on Progress in Physics, Volume 75, Issue 10, id. 106901 (2012). - Lashgari, H. , 1996. Synoptic pattern of severe rainfall in South West of Iran, Ph.d. thesis in Natural geography, Tarbiat modares University. - Lashgari, H. , 2002. Routing of systems Low pressure system The Sudanese The Sudanese entry To Iran Madras Special letter of geography 2, page:156-133. - Lashgari, H. , 2003. Mechanism of proliferation, Strengthening and development of a low pressure center of Sudan and its role on the South and South Western rainfall in Iran , Journal of researches: 2003, volume 35, number 46; page: 1-18. - Lashgari, H. , 2005. Synoptic analysis of two samples of the pattern of South Easthern winter rainfall in Iran , Modarres Magazine, Human Science, (Tarbiat modarres University) , Version 9, 2005. - Masoudian A., 2009. Rainfall regions of Iran; Journal of Geography and development, Spring 2009; Volume 7, number 13, page: 79-92. - Modarres, R. , 2007. Regional rainfall distributions of Iran, Journal of Pajouhesh & Sazandegi, No: 75. - Mohammadi, B. , and Masoudian A., 2010. Synoptic analysis of heavy rainfall in Iran, Case study: November 2010, Geography and development -Issue 19-autumn 1389; page: 47 -70. - Nazemosadat, M., Beigi, B. and Amin., S., 2003. Regionalization of winter precipitation in the provinces of Bushehr, Fars and Kohgilooye and Boyer Ahmad using main components analysis method, Journal of agricultural sciences and Techniques and natural resources, year VII, issue first. - Raj, P.P.N. and Azeez, P.A., 2010. Changing rainfall in the palakkad plains of south india ؛Environmental impact assessment division,Salim Ali centre for ornithology and Natural History (SACON) 23(1): 75-82 (2010). - Ramezani Gourabi, B. , and Farahi, S. , 2010. Zoning of daily rainfall and number of precipitation days in Anzali wetland Basin, Quarterly Journal of wetland, Islamic Azad University of Ahvaz, vol. 1, no. 4, summer, 2010, page :20-11 - Ramezani Gourabi, B. , and Izakmehri, S. , 2015. The Classification of temporal and Spatial on heavy rainfall in Gilan with GIS, Journal of geographical sciences, no: 22, summer and spring 2015, page :28-41. - Raziee T., and Azizi Gh. , 2008. Investigation of Spatial Patterns of Seasonal and Annual Precipitation in Western Iran, physical geographical research issue 65. - Rosenfeld D., 2000. Suppression of rain and snow by urban and industrial air pollution, Science, 287(5459), 1793-1796. - Rosenfeld, D., 2006. Aerosols suppressing precipitation in the Sierra Nevada: results of the 2006 winter field campaign. Presentation at the 3rd Annual Climate Change Research Conference, Sacramento, Sept. 2006. See www. climatechange.ca.gov/events/2006_conference/ presentations/2006-09-14/2006-09-14. - Rosenfeld, D., and Givati A., 2006. Evidence of orographic precipitation suppression by air pollution induced aerosols in the western USA, J. Applied Meteorology, 45, 893-911. - Rosenfeld, D., and Lensky. I. M., 1998. Satellite based insights into precipitation formation processes in continental and maritime convection clouds, Bull. American Meteorological Society, 79, 2457-2476. - Rosenfeld, D., Rudich Y., and Lahav, R. , 2001. Desert dust suppressing precipitation: A possible desertification feedback loop, Proc. Natl. Acad. Sci. USA, 98, 5975–5980, 2001. - Rosenfeld, D., Yu, X. and Dai. J., 2005. Satellite retrieved microstructure of AgI seeding tracks in supercooled layer clouds, J. Applied Meteorology, 44, 760-767. - Saaedra, S., Rodriguez, A., Taboada, J.J., Souto, J.A., and Casares, J.J., 2012. Patterns and air mass transport during ozone esiodes in northvestern liberia. science of to tal enivironmental, 441:97-110. - Sehatkashani, S., kamali, Gh. , Vazifedoust M. , Bidokht A., 2016. Study of Air Qualiyy over West and South West of Iran Using Aerosol Optical Thickness Products of Modis, Journal of Sharif, - Vieru‚ T., 2011. , Air Pollution Leads to Precipitation Pattern Shifts‚These changes can affect the global climate in its entirety. http://news.softpedia.com/news/Air-Pollution-Leads-to-Precipitation-Pattern-Shifts-234290.shtmlNov 14, 2011 09:36 GMT. | ||
|
آمار تعداد مشاهده مقاله: 666 تعداد دریافت فایل اصل مقاله: 430 |
||