A comparative study of past and projected future dynamics of drought hazards across the districts of the Northern Cape Province, South Africa: analysis of CRU TS4 data and CORDEX-Africa RCM simulations

被引：0
作者：
Opiyo, Stephen Balaka [1 ]
Pienaar, Lisa [1 ]
Piketh, Stuart J. [1 ]
Burger, Roelof P. [1 ]
Chikoore, Hector [2 ]
Havenga, Henno [1 ]
机构：
[1] North West Univ, Sch Geo & Spatial Sci, Unit Environm Sci & Management, Potchefstroom Campus,11 Hoffman St, ZA-2531 Potchefstroom, South Africa
[2] Univ Limpopo, Dept Geog & Environm Studies, Sovenga, South Africa
来源：
SOUTH AFRICAN GEOGRAPHICAL JOURNAL | 2025年
关键词：
Drought; climate change; SPEI; quantile mapping; Northern Cape; SUMMER RAINFALL; TEMPORAL ANALYSIS; BIAS CORRECTION; CLIMATE; VARIABILITY; VEGETATION; EVOLUTION; COAST;
D O I：
10.1080/03736245.2025.2490599
中图分类号：
P9 [自然地理学]; K9 [地理];
学科分类号：
0705 ; 070501 ;
摘要：
Drought is among the most pressing natural disasters of the 21st century. The need for insights to support local decision-making in planning and mitigation is critical. The Northern Cape Province of South Africa is highly drought-prone, yet its historical and projected drought patterns are not well understood. Therefore, this study assessed past (1962-2022), near-future (2023-2050), and far-future (2051-2100) drought dynamics across its five district municipalities-Frances Baard, John Taolo Gaetsewe, Namakwa, Pixley Ka Seme, and ZF Mgcawu-using CRU data and CORDEX-Africa RCM simulations based on CMIP6. Drought characteristics were analyzed using the Standardized Precipitation-Evapotranspiration Index (SPEI) at 6-, 12-, and 24-month timescales. Results revealed significant spatial and temporal variability. Frances Baard and John Taolo Gaetsewe experienced the most frequent short-term droughts, with far-future projections indicating a significant intensification of drought events (up to 8.2 events/decade for the 6-month SPEI). Namakwa and Pixley Ka Seme recorded the longest multi-year droughts historically (up to 78 months for the 24-month SPEI), with far-future projections showing continued severity for long-term droughts. Mann-Kendall trend analysis indicated significant upward trends in drought frequency and duration in Frances Baard and John Taolo Gaetsewe, while Namakwa showed mixed trends-a near-future decline followed by far-future intensification.
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页数：28
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