2023
DOI: 10.1002/joc.8215
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Drought metrics and temperature extremes over the Okavango River basin, southern Africa, and links with the Botswana high

Abstract: The Okavango River Basin (ORB), including the World Heritage site Okavango Delta, is a region of high biodiversity projected to suffer increased early summer drying under climate change. Little work has been done on drought over this sensitive region. Here, various drought metrics are analysed over the ORB. These include a cumulative drought intensity index, based on the product of maximum temperature anomaly and maximum duration of a dry spell, and the Standardized Precipitation‐Evapotranspiration Index. Stro… Show more

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Cited by 6 publications
(4 citation statements)
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“…"A" and "B" within the ORB denote the two main rivers, namely, the Cubango and Cuito, respectively, which merge to form the Okavango River which then feeds into the Okavango Delta through Mohembo hydrological station (orange circle). The ORB is also subdivided into the north catchment (red dashed polygon denoted by "NC") and Ngamiland (black dashed polygon denoted by "Ngami") generated and the latter subregion contains the world-famous Okavango Delta, where most of the streamflow terminates (Andersson et al 2003;Wolski and Murray-Hudson 2008;Moses et al 2023aMoses et al , 2023b. Due to lack of high-resolution observational data in the study area, the 0.05° resolution Climate Hazards Infrared Rainfall with Station data (CHIRPS; Funk et al 2015) version 2, and the 2-m air temperature (T2m) from 0.25° resolution ERA5 reanalyses (Copernicus Climate Change Service 2017; Hersbach et al 2020), were analysed to depict the annual cycles and climatologies of rainfall and temperature.…”
Section: Methodsmentioning
confidence: 99%
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“…"A" and "B" within the ORB denote the two main rivers, namely, the Cubango and Cuito, respectively, which merge to form the Okavango River which then feeds into the Okavango Delta through Mohembo hydrological station (orange circle). The ORB is also subdivided into the north catchment (red dashed polygon denoted by "NC") and Ngamiland (black dashed polygon denoted by "Ngami") generated and the latter subregion contains the world-famous Okavango Delta, where most of the streamflow terminates (Andersson et al 2003;Wolski and Murray-Hudson 2008;Moses et al 2023aMoses et al , 2023b. Due to lack of high-resolution observational data in the study area, the 0.05° resolution Climate Hazards Infrared Rainfall with Station data (CHIRPS; Funk et al 2015) version 2, and the 2-m air temperature (T2m) from 0.25° resolution ERA5 reanalyses (Copernicus Climate Change Service 2017; Hersbach et al 2020), were analysed to depict the annual cycles and climatologies of rainfall and temperature.…”
Section: Methodsmentioning
confidence: 99%
“…To be in line with the Intergovernmental Panel on Climate Change Sixth Assessment Report (IPCC 2021), which is based on CMIP6 models, ERA5 T2m and CHIRPS annual cycles and climatologies were analysed for the period 1985-2014, taken to be the historical period. The climatologies were analysed for ON, DJF and MA, based on previous analyses for rainfall over the ORB (Moses et al 2022(Moses et al , 2023a and for dry spells over southern Africa (Thoithi et al 2021). Very little rain occurs in the ORB during May-September.…”
Section: Methodsmentioning
confidence: 99%
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