The role of spatial displacement of Arabian subtropical high pressure in the annual displacement of the ITCZ in East Africa

Lashkari, H; Jafari, Mahnaz

doi:10.1007/s00704-020-03475-y

Cited by 12 publications

(3 citation statements)

References 37 publications

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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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“…(e.g. Lashkari et al 2021). The severity of heatwaves is increased by terrain features, high temperatures, and minimal rainfall.…”

Section: Maximum and Minimum Temperaturementioning

confidence: 99%

Observed heatwaves characteristics and variability over Saudi Arabia

Syed,

Al-Azemi,

Zamreeq

et al. 2024

Meteorol Atmos Phys

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Heatwaves are prolonged periods of excessively hot weather, which can have signi cant impacts on human health, agriculture, and the environment. Climate change has been linked to an increase in the frequency, intensity, and duration of heatwaves. As the global average temperature rises, heatwaves are becoming more common and more severe. The Arabian Peninsula is warming at a faster rate as compared to the globe in the recent decades. In this paper the mild, moderate, severe, and extreme heatwaves de ned by 85th, 90th, 95th and 99th percentile respectively are analyzed over Saudi Arabia using historical daily maximum and minimum temperature observations for the period 1985-2021. The large number of mild heatwaves are observed all over Saudi Arabia while extreme heatwaves are dominant in the northwestern region. Moderate and severe heatwaves are observed less in both the Red Sea and Arabian Gulf coastal regions. The heatwaves are intense in the northern and central areas as compared to other regions of the country. Heatwaves frequency, intensity and length in Saudi Arabia are in increasing trends, along with the increase in the heatwaves season length. The heatwaves frequency and intensity are observed large during the ENSO La Nina and neutral phases along with NAO negative phase as well as IOD negative and neutral phases. However, further investigation is required to see the occurrence of heatwaves in different climate zones over Saudi Arabia at various seasons and their teleconnection to largescale circulations.

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“…1, the elevation in the country ranges from 160 m below sea level at the northern end of the Rift Valley to more than 4600 m above sea level in northern mountainous regions (Teshome & Zhang, 2019). Several factors affect the climate of Ethiopia, and one of these factors is the regular movement of the Intertropical Convergence Zone (ITCZ), which moves to the north between March and September and to the south between October and January (Lashkari & Jafari, 2021).…”

Section: The Study Areamentioning

confidence: 99%

Climatological Study of SPEI Drought Index Using Observed and CRU Gridded Dataset over Ethiopia

Morsy

Moursy

Sayad

et al. 2022

Pure Appl. Geophys.

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This study aims to investigate the standardized precipitation evapotranspiration index (SPEI) using the monthly observed and gridded Climate Research Unit (CRU) dataset across 13 stations in Ethiopia during the period 1970–2005. SPEI is computed at a 4-month timescale to represent drought during the Belg (February–May) and Kirmet (June–September) seasons separately, and at an 8-month timescale to represent the drought during these two seasons together (February–September). The results show that there are extremely strong correlations (R ≥ 0.8) between the estimated precipitation values from CRU and the observed values, with root mean square error (RMSE) of 4–99 mm and mean percentage error (MPE%) of −30 to 73% at most stations. For temperature and SPEI, the CRU shows almost strong correlations (0.6 ≤ R < 0.8), while the dominant values of RMSE and MPE are 0.7–5 °C and −22 to 26%, respectively, for temperature and 0.28–0.96 and −49 to 55%, respectively, for SPEI during the three seasons. It is also found that each of the SPEI clusters (dry, normal, and wet) estimated from CRU has a high success percentage (≥ 60%) at more than 50% of the stations, while the general accuracy exceeds 60% for the three SPEI clusters together at more than 75% of the stations. Finally, the correct hits for the estimated SPEI clusters from CRU are often within the corresponding observed cluster but may shift into another category (extreme, severe, and moderate) except for a few events.

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The role of spatial displacement of Arabian subtropical high pressure in the annual displacement of the ITCZ in East Africa

Cited by 12 publications

References 37 publications

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

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

Observed heatwaves characteristics and variability over Saudi Arabia

Climatological Study of SPEI Drought Index Using Observed and CRU Gridded Dataset over Ethiopia

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