Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia
Climate change has an impact on rainfall and temperature. In this study, changes in rainfall and temperature extremes in Upper Awash Basin (Ethiopia) from 1983 to 2016 were investigated using daily combination of observed and satellite data of ten meteorological stations. To determine the annual tre...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-07-01
|
| Series: | Scientific African |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468227622000813 |
| _version_ | 1797996640470040576 |
|---|---|
| author | Haftu Brhane Gebremichael Gelana Amente Raba Kassahun Ture Beketie Gudina Legese Feyisa Teshome Siyoum |
| author_facet | Haftu Brhane Gebremichael Gelana Amente Raba Kassahun Ture Beketie Gudina Legese Feyisa Teshome Siyoum |
| author_sort | Haftu Brhane Gebremichael |
| collection | DOAJ |
| description | Climate change has an impact on rainfall and temperature. In this study, changes in rainfall and temperature extremes in Upper Awash Basin (Ethiopia) from 1983 to 2016 were investigated using daily combination of observed and satellite data of ten meteorological stations. To determine the annual trends, two non-parametric methods, namely Mann-Kendall and Sen's slope estimator were utilized. In this study, RClimDex1.1 was utilized to compute the selected temperature and rainfall extreme indices. The Inverse Distance Weighting (IDW) technique was used for spatial interpolation. The findings indicate significant trends in both annual and Kiremt (June – September) season rainfalls in two out of the ten stations, namely, Addis Alem and Koka Dam (p < 0.05). None of the ten stations exhibited significant trends for Belg (February-May) season. Overall, the mean rainfall trends of the basin indicate a considerable decline. However, from the spatial analysis, increasing rainfall and extreme events in the eastern portion of the basin were observed. Moreover, from average anomalies of the rainfall extreme indices of the entire basin showed a tendency of wetness. The maximum and the minimum temperatures displayed increasing trends in most of the weather stations (except in Addis Alem, and Kimoye for maximum temperature and Koka Dam, Hombole, Mojo, and Sendafa (AD) for minimum temperature). The temperature extreme indices showed increasing trends in TXx, TNx, TN90p, TX90p, SU25, and WSDI. The trend of the SU25 index indicated an increasing trend at 90% of the stations (p < 0.05). Overall, average anomalies of all temperature extreme indices of the entire basin (except TXn) revealed warming trends. The possible causes of these extreme events are the results of both local and global processes. Urban expansion and associated land use/cover changes could synergistically contribute to global warming. These findings are useful for the stakeholders in the region. |
| first_indexed | 2024-04-11T10:20:36Z |
| format | Article |
| id | doaj.art-7e342f77fed74de481c2ee3d90dff0a3 |
| institution | Directory Open Access Journal |
| issn | 2468-2276 |
| language | English |
| last_indexed | 2024-04-11T10:20:36Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Scientific African |
| spelling | doaj.art-7e342f77fed74de481c2ee3d90dff0a32022-12-22T04:29:46ZengElsevierScientific African2468-22762022-07-0116e01173Changes in daily rainfall and temperature extremes of upper Awash Basin, EthiopiaHaftu Brhane Gebremichael0Gelana Amente Raba1Kassahun Ture Beketie2Gudina Legese Feyisa3Teshome Siyoum4College of Natural and Computational Sciences, Haramaya University, Dire Dawa, P. O. Box 138, Ethiopia; Corresponding author.College of Natural and Computational Sciences, Haramaya University, Dire Dawa, P. O. Box 138, EthiopiaCenter of Environmental Sciences, Addis Ababa University, Addis Ababa, P. O. Box 1176, EthiopiaCenter of Environmental Sciences, Addis Ababa University, Addis Ababa, P. O. Box 1176, EthiopiaInstitution of Technology, Haramaya University, Dire Dawa, P. O. Box 138, EthiopiaClimate change has an impact on rainfall and temperature. In this study, changes in rainfall and temperature extremes in Upper Awash Basin (Ethiopia) from 1983 to 2016 were investigated using daily combination of observed and satellite data of ten meteorological stations. To determine the annual trends, two non-parametric methods, namely Mann-Kendall and Sen's slope estimator were utilized. In this study, RClimDex1.1 was utilized to compute the selected temperature and rainfall extreme indices. The Inverse Distance Weighting (IDW) technique was used for spatial interpolation. The findings indicate significant trends in both annual and Kiremt (June – September) season rainfalls in two out of the ten stations, namely, Addis Alem and Koka Dam (p < 0.05). None of the ten stations exhibited significant trends for Belg (February-May) season. Overall, the mean rainfall trends of the basin indicate a considerable decline. However, from the spatial analysis, increasing rainfall and extreme events in the eastern portion of the basin were observed. Moreover, from average anomalies of the rainfall extreme indices of the entire basin showed a tendency of wetness. The maximum and the minimum temperatures displayed increasing trends in most of the weather stations (except in Addis Alem, and Kimoye for maximum temperature and Koka Dam, Hombole, Mojo, and Sendafa (AD) for minimum temperature). The temperature extreme indices showed increasing trends in TXx, TNx, TN90p, TX90p, SU25, and WSDI. The trend of the SU25 index indicated an increasing trend at 90% of the stations (p < 0.05). Overall, average anomalies of all temperature extreme indices of the entire basin (except TXn) revealed warming trends. The possible causes of these extreme events are the results of both local and global processes. Urban expansion and associated land use/cover changes could synergistically contribute to global warming. These findings are useful for the stakeholders in the region.http://www.sciencedirect.com/science/article/pii/S2468227622000813Extreme rainfall and temperatureMann-Kendall trend testSen's slope estimatorRClimDex Upper Awash Basin |
| spellingShingle | Haftu Brhane Gebremichael Gelana Amente Raba Kassahun Ture Beketie Gudina Legese Feyisa Teshome Siyoum Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia Scientific African Extreme rainfall and temperature Mann-Kendall trend test Sen's slope estimator RClimDex Upper Awash Basin |
| title | Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia |
| title_full | Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia |
| title_fullStr | Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia |
| title_full_unstemmed | Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia |
| title_short | Changes in daily rainfall and temperature extremes of upper Awash Basin, Ethiopia |
| title_sort | changes in daily rainfall and temperature extremes of upper awash basin ethiopia |
| topic | Extreme rainfall and temperature Mann-Kendall trend test Sen's slope estimator RClimDex Upper Awash Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2468227622000813 |
| work_keys_str_mv | AT haftubrhanegebremichael changesindailyrainfallandtemperatureextremesofupperawashbasinethiopia AT gelanaamenteraba changesindailyrainfallandtemperatureextremesofupperawashbasinethiopia AT kassahunturebeketie changesindailyrainfallandtemperatureextremesofupperawashbasinethiopia AT gudinalegesefeyisa changesindailyrainfallandtemperatureextremesofupperawashbasinethiopia AT teshomesiyoum changesindailyrainfallandtemperatureextremesofupperawashbasinethiopia |