Page 147 - AJWEP-22-5

Climate trend and policy in Lake Tana Basin

23
y = 0.0831x + 20.626
22 R² = 0.4826
Temprature (°C) 22

21
21
20 Average decadal air temperature Trendline
20
1901-10 1911-20 1921-30 1931-40 1941-50 1951-60 1961-70 1971-80 1981-90 1991-00 2001-10 2011-20 2021-22

Years
Maximum decadal air temperature
33
33 Trendline
Temprature (°C) 32
32
31
R² = 0.4065
31 y = 0.1139x + 30.948
30
1901-10 1911-20 1921-30 1931-40 1941-50 1951-60 1961-70 1971-80 1981-90 1991-00 2001-10 2011-20 2021-22

Years
12
Minimum decadal air tempreture Trendline
12
Temprature (°C) 10
11
11

R² = 0.7025
10 y = 0.1499x + 9.3633
9
1901-10 1911-20 1921-30 1931-40 1941-50 1951-60 1961-70 1971-80 1981-90 1991-00 2001-10 2011-20 2021-22

Years
Figure 5. Decadal trends of average, maximum, and minimum air temperature (1901 – 2022)

annual rainfall displayed a significant downward trend, within the same basin between different agroecosystems.
with MKT values of −0.247 at the Woreta station Similarly, Shekuru et al. reported CVs of 15.9% for
[49]
(p=0.022) and −0.265 at the Delgi station (p=0.014) Dega and 20.8% for Kolla. Comparative results were
(Figure 6 and Table 4). also reported across different parts of the country.
In contrast, rainfall variability in areas with the Dega [9],[10],[69] Therefore, it is necessary to investigate rainfall
climate (temperate climate type) remains relatively low variability in different climatic zones to establish
(CV: 26.0% [Debre Tabor]; 22.3% [Injibara]). This mitigation and adaptation strategies for better and more
finding indicates that the amount of rainfall is highly sustainable livelihoods.
variable in Woina-Dega climatic areas compared to Seasonally, all stations experienced the highest
Dega-type climates, suggesting rainfall variability amount of rainfall during Kiremt and the lowest amount

Volume 22 Issue 5 (2025) 141 doi: 10.36922/AJWEP025190142