Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran
The purpose of this study is to determine the long-term variations in rainfall data as well as to identify wet and dry periods of 35 synoptic stations in Iran. In order to know the variation of rainfall in studied stations, average maps, coefficient of variation and skewness were drawn. Then, using...
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Kharazmi University
2023-03-01
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| Series: | تحقیقات کاربردی علوم جغرافیایی |
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| Online Access: | http://jgs.khu.ac.ir/article-1-3526-en.pdf |
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| author | mina mirian mostafa karampoor mohamd moradi houshang ghemi behrouz nasiri |
| author_facet | mina mirian mostafa karampoor mohamd moradi houshang ghemi behrouz nasiri |
| author_sort | mina mirian |
| collection | DOAJ |
| description | The purpose of this study is to determine the long-term variations in rainfall data as well as to identify wet and dry periods of 35 synoptic stations in Iran. In order to know the variation of rainfall in studied stations, average maps, coefficient of variation and skewness were drawn. Then, using the Mann-Kendall test, the significance of the trend on each station was tested at 95% confidence level. Finally, wet and dry periods were identified by using 20% high and low extreme rainfall during the 50-year study period. The results show that the general model of the country's regime is that the rainfall levels from the north to the south-east and from the west to the east of the country are reduced. The lowest values of the coefficient of variation and skewness are related to the northern regions especially the Caspian seaside and the highest amounts are in the southern regions, especially in the south and south-east. In general, the results of the Mann-Kendall test show that rainfall data in the seasonal scale, with the exception of several synoptic stations, do not show a significant trend. Most wet periods occur in the spring and the lowest in summer and the highest dry periods occur in the autumn and the lowest in spring. The number of droughts in the cold periods is significant. Also, the frequency of occurrence of dry periods is more than wet periods. |
| format | Article |
| id | doaj-art-7aad648c98b548339cbf37c3263a31d1 |
| institution | Kabale University |
| issn | 2228-7736 2588-5138 |
| language | fas |
| publishDate | 2023-03-01 |
| publisher | Kharazmi University |
| record_format | Article |
| series | تحقیقات کاربردی علوم جغرافیایی |
| spelling | doaj-art-7aad648c98b548339cbf37c3263a31d12025-01-31T17:29:46ZfasKharazmi Universityتحقیقات کاربردی علوم جغرافیایی2228-77362588-51382023-03-012368327343Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iranmina mirian0mostafa karampoor1mohamd moradi2houshang ghemi3behrouz nasiri4 PhD student of Meteorology, Faculty of Literature and Humanities, Department of Geography, Lorestan University, Khorramabad, Iran Assistant Professor of Meteorology, Faculty of Literature and Humanities, Department of Geography, Lorestan University, Khorramabad, Iran Assistant Professor of Meteorology, Meteorological Research Center, Tehran, Iran Professor of Meteorology, Meteorological Organization, Tehran, Iran Associate Professor of Literature and Humanities, Department of Geography, University of Lorestan, Khorramabad, Iran The purpose of this study is to determine the long-term variations in rainfall data as well as to identify wet and dry periods of 35 synoptic stations in Iran. In order to know the variation of rainfall in studied stations, average maps, coefficient of variation and skewness were drawn. Then, using the Mann-Kendall test, the significance of the trend on each station was tested at 95% confidence level. Finally, wet and dry periods were identified by using 20% high and low extreme rainfall during the 50-year study period. The results show that the general model of the country's regime is that the rainfall levels from the north to the south-east and from the west to the east of the country are reduced. The lowest values of the coefficient of variation and skewness are related to the northern regions especially the Caspian seaside and the highest amounts are in the southern regions, especially in the south and south-east. In general, the results of the Mann-Kendall test show that rainfall data in the seasonal scale, with the exception of several synoptic stations, do not show a significant trend. Most wet periods occur in the spring and the lowest in summer and the highest dry periods occur in the autumn and the lowest in spring. The number of droughts in the cold periods is significant. Also, the frequency of occurrence of dry periods is more than wet periods.http://jgs.khu.ac.ir/article-1-3526-en.pdftrendprecipitationmann-kendalliran |
| spellingShingle | mina mirian mostafa karampoor mohamd moradi houshang ghemi behrouz nasiri Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran تحقیقات کاربردی علوم جغرافیایی trend precipitation mann-kendall iran |
| title | Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran |
| title_full | Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran |
| title_fullStr | Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran |
| title_full_unstemmed | Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran |
| title_short | Statistical and anomalies analysis of the 50-year precipitation of the synoptic stations in Iran |
| title_sort | statistical and anomalies analysis of the 50 year precipitation of the synoptic stations in iran |
| topic | trend precipitation mann-kendall iran |
| url | http://jgs.khu.ac.ir/article-1-3526-en.pdf |
| work_keys_str_mv | AT minamirian statisticalandanomaliesanalysisofthe50yearprecipitationofthesynopticstationsiniran AT mostafakarampoor statisticalandanomaliesanalysisofthe50yearprecipitationofthesynopticstationsiniran AT mohamdmoradi statisticalandanomaliesanalysisofthe50yearprecipitationofthesynopticstationsiniran AT houshangghemi statisticalandanomaliesanalysisofthe50yearprecipitationofthesynopticstationsiniran AT behrouznasiri statisticalandanomaliesanalysisofthe50yearprecipitationofthesynopticstationsiniran |