Evaluation of climate change impact on extreme temperature variability in the Blue Nile Basin, Ethiopia
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Published:2021-02-24
Issue:1
Volume:10
Page:45-54
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ISSN:2193-0864
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Container-title:Geoscientific Instrumentation, Methods and Data Systems
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language:en
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Short-container-title:Geosci. Instrum. Method. Data Syst.
Author:
Mohamed Mostafa Abdel-Hameed, El-Mahdy Mohamed El-SayedORCID
Abstract
Abstract. Climate change raises important issues concerning hydrological engineering.
The impact of climate change on important river basins should be
investigated rigorously. Extreme temperature variability has a direct impact
on the hydrological cycle, especially the evaporation component. In this
paper, spatial and temporal patterns of changes in extreme temperatures were
investigated using 10 meteorological stations' data for the period 1950–2018
in the Blue Nile Basin. Long-term trends in the Blue Nile Basin annual and
monthly temperatures were investigated. The statistical significance of the
trend was calculated by applying the Mann–Kendall (MK) test. The analysis of
data was performed using the coefficient of variance and anomaly index. The
results showed that the annual maximum and minimum temperatures were
increasing significantly with a magnitude of 0.037 and
0.025 ∘C per decade respectively in the period from 1950 to
2018. The result of the Mann–Kendall analysis test revealed a marked
increase in the mean maximum and minimum temperature trends over time during
the study period (the minimum temperature rate is more evident than the
maximum). The long-term anomalies of mean annual minimum temperature
revealed the interannual variability while the trend after 1977 was higher
than the long-term average, which is proof of the warming trend's existence
during the last two decades of the 20th century.
Publisher
Copernicus GmbH
Subject
Atmospheric Science,Geology,Oceanography
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