Halabian, A., Ghasemi Siani, A. (2021). Analysis of the spatial and temporal trend in precipitation on Caspian basin using GPCC data. , 13(2), 283-294. doi: 10.22092/ijwmse.2020.125399.1610
Amirhossein Halabian; Ali Ghasemi Siani. "Analysis of the spatial and temporal trend in precipitation on Caspian basin using GPCC data". , 13, 2, 2021, 283-294. doi: 10.22092/ijwmse.2020.125399.1610
Halabian, A., Ghasemi Siani, A. (2021). 'Analysis of the spatial and temporal trend in precipitation on Caspian basin using GPCC data', , 13(2), pp. 283-294. doi: 10.22092/ijwmse.2020.125399.1610
Halabian, A., Ghasemi Siani, A. Analysis of the spatial and temporal trend in precipitation on Caspian basin using GPCC data. , 2021; 13(2): 283-294. doi: 10.22092/ijwmse.2020.125399.1610

Analysis of the spatial and temporal trend in precipitation on Caspian basin using GPCC data

مهندسی و مدیریت آبخیز
Article 4, Volume 13, Issue 2, July 2021, Pages 283-294    PDF (1.97 M)
Document Type: Research Paper
DOI: 10.22092/ijwmse.2020.125399.1610
Authors
Amirhossein Halabian* ; Ali Ghasemi Siani
M.A student in Climatology, Payame Noor University, Isfahan, Iran
Abstract
In this research, for analysis the spatial- temporal trend of precipitation in Caspian basin, the monthly data of GPCC data base in the spatial resolution of 0.5°×0.5° during 63 years period(1951- 2013) have been used. In order to analyze of the spatial- temporal trend of precipitation, the mean of annual, seasonal and monthly amounts of precipitation were prepared and then by applying Mann-Kendall nonparametric test at 0.95 level of significance, 17 maps precipitation spatial trend were produced in GIS. To examine the temporal trend of precipitation, first 17 graphs were prepared using the weighted amount of precipitation and then the trend was evaluated using Mann-Kendall nonparametric test at 0.95 level of significance. The evaluation of monthly precipitation spatial trend maps indicated a significant downward trend at 0.95 level of significance in March and April on the western, eastern and southwest regions of Caspian basin. Only in spring and autumn there have been a significant downward trend and in none of the other seasons no meaningful trend was detected. Also, the analysis of yearly precipitation spatial trend illustrated a significant downward trend on western region. The analysis of precipitation revealed significant downward trend on monthly time series at the 0.95 level of significance in March on Caspian basin.
Keywords
Precipitation; Time series; Significante trend; Mann–Kendall; Caspian basin
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