Summer Precipitation Variability Analysis and its Relationship with the Indian Ocean Dipole (Case Study: South-East of Iran)

Armesh, Mohsen; Khosravi, Mahmood; Saligheh, Mohammad

Document Type : Research Paper

Authors

Ph.D. Candidate, University of Sistan and Baluchestan

Abstract

This study aimed to evaluate the variability of summer precipitation in the South East of Iran was selected stations and the precipitation associated was investigated with IOD index. For this purpose was used weekly precipitation data from June to September stations of Zahedan, Kerman, Bandar Abbas, Iranshahr and Bam and weekly IOD index data. The method of this study is the correlation coefficient and discrete wavelet analysis. The results showed that in the positive phase of the IOD Index, warm air and humid of West Africa, sucked by low pressure the Persian Gulf and Pakistan and conditions creates convection in southeast of Iran, while IOD negative phase, in addition to shiftting the intertropical Convergence Zone, low pressure Persian Gulf and Pakistan are gone and West Indian Ocean for cooling than normal, stable atmosphere reigns. Summer precipitation correlation analysis between Bandar Abbas and Iranshahr with IOD index showed the strongest association. After the precipitation signal analysis of the stations showed of the Zahedan station on Level 4 and 3, respectively, at 99 and 95% was related to IOD index. The following series Kerman and Bam precipitation did not show any relationship with IOD index. Data analysis by the discrete wavelet transform showed that the most important cycle repeating 11-year occurred in the IOD index. Zahedan and Iranshahr showed periodic cycles relatively similarly. In Kerman was appeared 7-year cycle dominant and in Bandar Abbas and Bam the 11-year cycle. The process of reducing the number of weeks along with summer precipitation in the form of stations is contrary to the IOD index. But the increased intensity of precipitation stations is directly related to this index. Also Bandar Abbas, Iranshahr and Zahedan have more balanced precipitation cycles, but summer precipitation anomalies are intense in Kerman and Bam.

Keywords

Main Subjects

Climatology

References

- اداره کل هواشناسی استانهای سیستان و بلوچستان، کرمان و هرمزگان (1394).

- جلالی، مسعود؛ شاهبایی، علی و وهاب کمریان (1396)، شناسایی الگوهای همدید بارشهای شدید تابستانه در سواحل جنوبی دریای خزر، جغرافیا و برنامهریزی، سال 21، شماره 59، 39-23.

- جهانبخش، سعید؛ ساری صراف، بهروز؛ قائمی، هوشنگ و فرناز پوراصغر (1390)، بررسی تاثیر پدیده دوقطبی دمایی اقیانوسهند بر تغییرپذیری بارشهای فصلی استانهای جنوبی کشور، تحقیقات جغرافیایی، سال 26، شماره 103، صص 46-27.

- خسروی، محمود و محمدرضا پودینه (1389)، تحلیلی بر تأثیرات اقلیمی چرخند حارهای گونو(خرداد 1386) بر جنوبشرق ایران، پژوهشهای جغرافیایطبیعی، شماره 72، صص 72-53.

- خسروی، محمود، محمد سلیقه، و بهروز صباغی (1390)، تأثیر آنومالیهای دمای سطح دریای عمان بر بارندگی فصول پاییز و زمستان سواحل جنوبشرقی ایران، جغرافیا و برنامهریزی، شماره 37، صص 81-59.

- خورشیددوست، علی محمد و یوسف قویدل رحیمی (1385)، ارزیابی اثر پدید انسو بر تغییرپذیری بارشهای فصلی استان آذربایجانشرقی با استفاده از شاخص چندمتغیره انسو، پژوهشهای جغرافیایی، شماره 57، صص 26-15.

- رورده، همتالله؛ یوسفی، یدالله؛ معصومپور سماکوش، جعفر و وحید فیضی (1393)، تغییرپذیری زمانی ـ مکانی بارشهای حدی در ایران، جغرافیا و برنامهریزی محیطی، سال 25، شماره 54، صص 36-25.

- سلیقه، محمد؛ عساکره، حسین؛ ناصرزاده، محمدحسین و یدالله بلیانی(1394)، تحلیل روند و چرخههای سری زمانی بارش سالانه حوضههای آبریز حله و مند، تحقیقات کاربردی علوم جغرافیایی، سال 15، شماره 37، صص 271-245.

- لشکری، حسن و قاسم کیخسروی (1389)، تحلیل سینوپتیکی طوفان گونو و اثرات آن بر جنوب شرق ایران، جغرافیا و برنامه‌ریزی محیطی، سال 21، شماره 39، صص 20-1.

- لشکری، حسن؛ متکان، علیاکبر و زینب محمدی (1397)، تحلیل الگوهای همدیدی منجر به بارشهای زودرس جنوب و جنوبغرب ایران طی دوره آماری (1979-2015)، جغرافیا و برنامهریزی، سال 24، شماره 64، 272-253.

- Chen Y., Guan Y., Shao G. and Zhang D. (2016), Investigating Trends in Streamflow and Precipitation in Huangfuchuan Basin withWavelet Analysis and the Mann-Kendall Test, Water, 8, 77, 1-32.

-Harou A. P., Lajoie R. F., Kniveton D. R. and Michael R. F. (2006), The influence of the Indian Ocean Dipole Mode on precipitation over the Seychelles, Int. J. Climatol, Vol. 26, 45–54.

-Hea X., Guana H. and Qin J., (2015), A hybrid wavelet neural network model with mutual information and particle swarm optimization for forecasting monthly rainfall, J. of Hydrology, Vol. 527, 88–100.

-Hermida L., López L., Merino A., Berthet C., García-Ortega E., Sánchez J. L. and Dessens J. (2015), Hailfall in southwest France: Relationship with precipitation, trends and wavelet analysis, Atmospheric Research, Vol. 156, 174–188.

-Kantelhardt a J. W., Rybskia D., Zschiegnerb S. A., Braunc P., Koscielny-Bunde a E., Livinae V., Havline S. and Bunde A. (2003), Multifractality of river runoff and precipitation: comparison of fluctuation analysis and wavelet methods, Physica A: Statistical Mechanics and its Applications, Vol. 330, Issues 1–2, 240–245.

-Kisi O. and Cimen M. (2012), Precipitation forecasting by using wavelet-support vector machine conjunction model, Engineering Applications of Artificial Intelligence, Vol. 25, Issue 4, 783–792.

-Maity R., Suman M. and Verma N. K. (2016), Drought prediction using a wavelet based approach to model the temporal consequences of different types of droughts, Journal of Hydrology, Vol. 539, 417–428.

-Nalley D., Adamowski J. and B. Khalil (2012), Using discrete wavelet transforms to analyze trends in streamflow and precipitation in Quebec and Ontario (1954-2008), J. of Hydrology, Vol. 475, 204–228.

-Okkan U. (2012), Wavelet neural network model for reservoir inflow prediction, Scientia Iranica, Vol. 19, Issue 6, 1445-1455.

-Ozgera M., Mishrab A. K. and Singh V. P. (2010), Scaling characteristics of precipitation data in conjunction with wavelet analysis, J. of Hydrology, Vol. 395, Issues 3–4, 279–288.

-Partala T. and Kişi O. (2007), Wavelet and neuro-fuzzy conjunction model for precipitation forecasting, J. of Hydrology, Vol. 342, Issues 1–2, 199–212.

-Rashid a M. D. M., Beecham a S. and Chowdhury R.K. (2015), Assessment of trends in point rainfall using Continuous Wavelet Transforms, Advances in Water Resources, Vol. 82, 1–15.

-Saji N. H., Goswami B. N., Vinyachadran P. N. and Yamagata T., (1999), A Dipole Mode in the Tropical Indian Ocean, Nature, Vol. 401, 360-363.

-Vinayachandran P.N., Francis P.A., Rao S.A. (2009), Indian Ocean dipole: processes and impacts, In: Current trends in science, platinum jubilee special volume of the Indian Academy of Sciences, Indian Academy of Science, Bangalore, India, 569–589.

-Zhao Y., Zou X., Cao L. and Xu X. (2014), Changes in precipitation extremes over the Pearl River Basin, southern China, during 1960–2012,Quaternary International, Vol. 333, 26–39.

http://www.jamstec.go.jp/frcgc/research/d1/iod/e/iod/about_iod.html

http://www.jamstec.go.jp/frcgc/research/d1/iod/iod/dipole_mode_index.html

Journal of Geography and Planning

Summer Precipitation Variability Analysis and its Relationship with the Indian Ocean Dipole (Case Study: South-East of Iran)

References

References

Volume 22, Issue 65 - Serial Number 65
November 2018
Pages 45-62

Summer Precipitation Variability Analysis and its Relationship with the Indian Ocean Dipole (Case Study: South-East of Iran)

References

References

Volume 22, Issue 65 - Serial Number 65November 2018Pages 45-62

Volume 22, Issue 65 - Serial Number 65
November 2018
Pages 45-62