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Spatial Analysis of Seasonal Precipitation over Iran: Co-Variation with Climate Indices

EasyChair Preprint no. 2395

25 pagesDate: January 15, 2020


Temporary changes in precipitation may lead to sustained and severe drought or massive floods in different parts of the world. Knowing variation in precipitation can effectively help the water resources decision-makers in water resources management. Large-scale circulation drivers have a considerable impact on precipitation in different parts of the world. In this research, the impact of El Niño-Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and North Atlantic Oscillation (NAO) on seasonal precipitation over Iran was investigated. For this purpose, 103 synoptic stations with at least 30 years of data were utilized. The Spearman correlation coefficient between the indices in the previous 12 months with seasonal precipitation was calculated, and the meaningful correlations were extracted. Then the month in which each of these indices has the highest correlation with seasonal precipitation was determined. Finally, the overall amount of increase or decrease in seasonal precipitation due to each of these indices was calculated. Results indicate the Southern Oscillation Index (SOI), NAO, and PDO have the most impact on seasonal precipitation, respectively. Also, these indices have the highest impact on the precipitation in winter, autumn, spring, and summer, respectively. SOI has a diverse impact on winter precipitation compared to the PDO and NAO, while in the other seasons, each index has its special impact on seasonal precipitation. Generally, all indices in different phases may decrease the seasonal precipitation up to 100%. However, the seasonal precipitation may increase more than 100% in different seasons due to the impact of these indices. The results of this study can be used effectively in water resources management and especially in dam operation.

Keyphrases: advanced statistics, machine learning, North Atlantic Oscillation, Pacific Decadal Oscillation, Seasonal Precipitation, Southern Oscillation Index, spatial analysis, spatiotemporal database, Spearman correlation coefficient

BibTeX entry
BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
  author = {Majid Dehghani and Somayeh Salehi and Amir Mosavi and Narjes Nabipour and Shahaboddin Shamshirband and Pedram Ghamisi},
  title = {Spatial Analysis of Seasonal Precipitation over Iran: Co-Variation with Climate Indices},
  howpublished = {EasyChair Preprint no. 2395},

  year = {EasyChair, 2020}}
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