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Atmosphere 2018, 9(9), 326; https://doi.org/10.3390/atmos9090326

Innovative Trend Analysis of Annual and Seasonal Rainfall Variability in Amhara Regional State, Ethiopia

1
College of Environmental Science & Engineering, Donghua University, Shanghai 200336, China
2
Department of NaRM, University of Gondar, Gondar 196, Ethiopia
3
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resource and Hydropower Research, Beijing 100038, China
*
Author to whom correspondence should be addressed.
Received: 14 July 2018 / Revised: 12 August 2018 / Accepted: 14 August 2018 / Published: 21 August 2018
(This article belongs to the Section Climatology and Meteorology)
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Abstract

This study investigated the annual and seasonal rainfall variability at five selected stations of Amhara Regional State, by using the innovative trend analysis method (ITAM), Mann-Kendall (MK) and Sen’s slope estimator test. The result showed that the trend of annual rainfall was increasing in Gondar (Z = 1.69), Motta (Z = 0.93), and Bahir Dar (Z = 0.07) stations. However, the trends in Dangla (Z = −0.37) and Adet (Z = −0.32) stations showed a decreasing trend. As far as monthly and seasonal variability of rainfall are concerned, all the stations exhibited sensitivity of change. The trend of rainfall in May, June, July, August, and September was increasing. However, the trend on the rest of other months showed a decreasing trend. The increase in rainfall during Kiremt season, along with the decrease in number of rainy days, leads to an increase of extreme rainfall events over the region during 1980–2016. The consistency in rainfall trends over the study region confirms the robustness of the change in trends. Innovative trend analysis method is very crucial method for detecting the trends in rainfall time series data due to its potential to present the results in graphical format as well. The findings of this paper could help researchers to understand the annual and seasonal variability of rainfall over the study region and become a foundation for further studies. View Full-Text
Keywords: rainfall variability; temporal variation; innovative trend analysis method; Mann-Kendall test; Amhara Regional State rainfall variability; temporal variation; innovative trend analysis method; Mann-Kendall test; Amhara Regional State
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Gedefaw, M.; Yan, D.; Wang, H.; Qin, T.; Girma, A.; Abiyu, A.; Batsuren, D. Innovative Trend Analysis of Annual and Seasonal Rainfall Variability in Amhara Regional State, Ethiopia. Atmosphere 2018, 9, 326.

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