July–September rainfall in the Greater Horn of Africa: the combined influence of the Mascarene and South Atlantic highs

Dyer, Ellen; Hirons, Linda; Taye, Meron Teferi

doi:10.1007/s00382-022-06287-0

Cited by 3 publications

(2 citation statements)

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“…This gives rise to the bimodal rainfall pattern in region II and region III and the monomodal pattern in region I of the basin. The variation of onset and offset window is depending on the weakening and strengthen of subtropical high-pressure systems (Dyer et al, 2022;Lashkari & Jafari, 2021b). Various previous studies have investigated that the Ethiopian summer rainfall is affected by the variation of equatorial pacific sea surface temperature (SST) and its teleconnection with summer rainfall (Block & Rajagopalan, 2007;Diro et al, 2011a;Gissila et al, 2004;Gleixner et al, 2017;Korecha & Barnston, 2007).…”

Section: Discussionmentioning

confidence: 99%

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Ayalew

Wagner

Sahlu

et al. 2022

Environ Monit Assess

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Land use and climate dynamics have a pronounced impact on water resources, biodiversity, land degradation, and productivity at all scales. Thus, in this study, we present the spatio-temporal dynamics of land use change and climate aiming to provide a scientific evidence about gains and losses in major land use categories and associated drivers and significancy and homogeneity of climate change. To this end, Landsat images and historical climate data have been used to determine the dynamics. In addition, population census data and land use policy have been considered to assess the potential drivers of land use change. The spatio-temporal land use dynamics have been evaluated using transition matrix and dynamics index. Likewise, shifts in the climate data were analyzed using change point analysis and three homogenous climate zones have been identified using principal component analysis. The results show that, from 1989 to 2019, the areal percentage of agricultural land increased by 27.5%, settlement by 0.8%, and barren land 0.4% while the natural vegetation, wetland, water body, and grass land decreased by 24.5%, 1.6%, 0.5%, and 2.1%, respectively. The land use dynamics have been stronger in the first decade of the study period. An abrupt shift of climate has occurred in the 1980s. In the last four decades, rainfall shows a not significant decreasing trend. However, a significant increasing trend has been observed for temperature. Rapid population growth, agricultural expansion policy, and climate variability have been identified as the underlying drivers of land use dynamics.

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Section: Discussionmentioning

confidence: 99%

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Ayalew

Wagner

Sahlu

et al. 2022

Environ Monit Assess

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“…The region has a diverse climate, ranging from hot, dry regions to cooler, wetter highland regions, with considerable variability in seasonal rainfall [19] and a very complex topography. It is largely influenced by largescale seasonal atmospheric patterns and the warm waters of the Indian Ocean [16] and Atlantic Ocean [20][21][22]. The rainfall is characterized by an unimodal cycle with a wet season from July to September (JAS) for the northern parts of the region within the Nile basin (Ethiopia, Sudan) [23] and a bimodal annual cycle in the rest of the region, featuring long rains from March to May (MAM) and the short rains from October to December (OND) [11].…”

Section: East Africamentioning

confidence: 99%

Hydrologic Extremes in a Changing Climate: a Review of Extremes in East Africa

Taye,

Dyer

2024

Curr Clim Change Rep

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Purpose Eastern Africa has a complex hydroclimate and socio-economic context, making it vulnerable to climate change-induced hydrological extremes. This review presents recent research on drivers and typologies of extremes across different geographies and highlights challenges and improvements in forecasting hydrological extremes at various timescales. Recent Findings Droughts and floods remain the major challenges of the region. Recently, frequent alterations between droughts and floods have been a common occurrence and concern. Research underlines the heterogeneity of extremes and the impact of climate change as increased intensity and duration of extremes. Moreover, the importance of local and antecedent conditions in changing the characteristics of extremes is emphasized. Summary A better understanding of these drivers and how they interact is required. Observational and modeling tools must capture these relationships and extremes on short timescales. Although there are improvements in forecasting these extremes, providing relevant information beyond meteorological variables requires further research.

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