Characteristics of precipitation in northern Mauritania and its links with sea surface temperature |
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| Authors: | OCA Ahmedou H Yasuda K Wang K Hattori |
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| Institution: | aUnited Graduate School of Agricultural Sciences, Tottori University, Koyama Minami 4-101, Tottori 680-8553, Japan;bArid Land Research Center, Tottori University, Hamasaka 1390, Tottori 680-0001, Japan;cState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;dFaculty of Agriculture, Tottori University, Koyama Minami 4-101, Tottori 680-8553, Japan |
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| Abstract: | This paper deals with the periodic fluctuation of precipitation at three meteorological stations (Atar, Chenguitti, and Akjoujt) in the Adrar and Inchiri provinces in northern Mauritania and its links with sea surface temperature (SST). Trends for these three meteorological stations were evaluated using the Mann–Kendall (MK) nonparametric test, regression analysis, and autocorrelation for persistence analysis. The MK test showed a significant decreasing trend for Akjoujt and an insignificant trend for the other rainfall time series. However, the decreasing linear regression trends were highly significant for the different time series. On the other hand, persistence analysis indicated the presence of a linear Markov type. The cycles found by power spectrum analysis ranged from 0.5 years to about 11 years. The possibility of a connection between precipitation in this region and sunspot numbers was suggested. SST of the Atlantic Ocean, Indian Ocean, and Mediterranean Sea have significant cross-correlations with precipitation in the study area. The El Niño-Southern Oscillation effect was found to be marginal. |
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| Keywords: | Frequencies Mauritania Rainfall periodic fluctuation SST |
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