Abstract
This study examines the impacts of climate change on characteristics of extreme precipitation events over four African coastal cities (Cape Town, Maputo, Lagos and Port Said) under two future climate scenarios (RCP4.5 and RCP8.5). Fourteen indices were used to characterise extreme precipitation and 16 multi-model simulation datasets from the Coordinated Regional Climate Downscaling Experiment (CORDEX) were analysed. The capability of the models to reproduce past characteristics of extreme precipitation over the cities was evaluated against four satellite datasets after quantifying the observation uncertainties over the cities. The models give realistic simulation of extreme precipitation characteristics over the cities, and in most cases, the magnitudes of the simulation biases are within the observation uncertainties. For both the RCP4.5 and RCP8.5 scenarios, the models project a decrease in wet days and an increase in dry spells over the four cities in the future. More intense daily precipitation is projected over Maputo, Lagos and Port Said. The intensity and frequency of extreme precipitation events are projected to increase over Lagos, but decrease over the other cities. A decrease in annual precipitation is projected over Cape Town, Maputo and Port Said, whilst an increase is projected over Lagos, where the water surplus from the more extreme precipitation events exceeds the deficit from the less wet days. A decrease in the number of widespread extreme events is indicated over all the cities. Wet-day percentile and all-day percentile methods signal opposite future changes in the extreme precipitation thresholds over the cities (except over Lagos). The results of this study may have application in managing the vulnerabilities of these coastal cities to extreme precipitation events under climate change.
References
Abiodun BJ, Gutowski WJ, Abatan AA, Prusa J (2011) CAM-EULAG: A non-hydrostatic atmospheric climate model with grid stretching. ACTA Geophysica 59:1159–1167. doi:10.2478/s11600-011-0032-2
Abiodun BJ, Lawal KA, Salami AT, Abatan AA (2013) Potential influences of global warming on future climate and extreme events in Nigeria. Reg Environ Chang 13(3):477–491. doi:10.1007/s10113-012-0381-7
Abiodun BJ, Abbar SO, Lennard C, Jack C (2015) Using regional climate models to simulate extreme precipitation events in the Western Cape in South Africa. Int J Climatol. doi:10.1002/joc.4376
Adegoke J. O and C. Ibe (2014) Minimizing vulnerabilities of coastal cities in Africa through adaptation to climate change impacts. The 12th AMS Symposium on the Coastal Environment in Atlanta (USA) https://ams.confex.com/ams/94Annual/webprogram/Paper240141.html
Biasutti M, Held IM, Sobel AH, Giannini A (2008) SST forcings and Sahel rainfall variability in simulations of the twentieth and twenty-first centuries. J Clim 21:3471–3486
Coles S (2001) An introduction to statistical modeling of extreme values. Springer Series in Statistics, London
Diaconescu EP, Gachon P, Laprise R (2015) On the remapping procedure of daily precipitation statistics and indices used in regional climate model evaluation. J Hydrometeorol 16:2301–2310. doi:10.1175/JHM-D-15-0025.1
Dosio A, Panitz HJ (2016) Climate change projections for CORDEX-Africa with COSMO-CLM regional climate model and differences with the driving global climate models. Clim Dyn 46(5–6):1599–1625
El Raey M (2009) Climate change needs for the coastal zone of Egypt, background paper to the “National Environmental, Economic and Development Study (NEEDS) for Climate Change”. Cairo, Egypt
Engelbrecht FA, McGregor JL, Engelbrecht CJ (2009) Dynamics of the conformal-cubic atmospheric model projected climate-change signal over southern Africa. Int J Climatol 29:1013–1033. doi:10.1002/joc.1742
Engelbrecht CJ, Engelbrecht FA, Dyson LL (2013) High-resolution model-projected changes in mid-tropospheric closed-lows and extreme rainfall events over southern Africa. Int J Climatol 33:173–187. 10.1002/joc.3420
Engelbrecht F, Adegoke J, Bopape MJ, Naidoo M, Garland R, Thatcher M, McGregor J, Katzfey J, Werner M, Ichoku C, Gatebe C (2015) Projections of rapidly rising surface temperatures over Africa under low mitigation. Environ Res Lett 10(8). doi:10.1088/1748-9326/10/8/085004
Estie KE (1981) The Laingsburg flood disaster of 25 January 1981. S Afr Weather Bur Newsl 383:19–32
Funk C, Peterson P, Landsfeld M, Pedreros D, Verdin J, Shukla S, Husak G, Rowland J, Harrison L, Hoell A, Michaelsen J (2015) The climate hazards infrared precipitation with stations—a new environmental record for monitoring extremes. Sci Data 2:150066. doi:10.1038/sdata.2015.66 2015
Haensler A, Saeed F, Jacob D (2013) Assessing the robustness of projected precipitation changes over central Africa on the basis of a multitude of global and regional climate projections. Clim Chang 121:349–363
Hamdi R. H. Van de Vyver, R. De Troch, P. Termonia (2015) Assessment of three dynamical urban climate downscaling methods: Brussels’s future urban heat island under an A1B emission scenario, doi:10.1002/joc.3734/abstract
Hewitson B, Daron J, Crane R, Zermoglio M, Jack C (2013) Interrogating empirical statistical downscaling. Clim Chang 122:539–554
Holloway A, Fortune G, Chasi V, Beckman T, Disaster Mitigation for Sustainable Livelihoods Programme (University of Cape Town) (2010) RADAR Western Cape 2010: risk and development annual review. PeriPeri Publications, Rondebosch
Huffman GJ, Adler RF, Morrissey MM et al (2001) Global precipitation at one-degree daily resolution from multisatellite observations. J Hydrometeorol 2:36–50. doi:10.1175/1525-7541(2001)002<0036:GPAODD>2.0.CO;2
Huffman GJ, Adler RF, Bolvin DT et al (2007) The TRMM Multisatellite Precipitation Analysis (TMPA): quasi-global, multiyear, combined-sensor precipitation estimates at fine scales. J Hydrometeorol 8:38–55. doi:10.1175/JHM560.1
Ibe AC (1989) Vulnerability of coastal cities in Africa to sea level rise: case studies of Lagos, Banjul and Dar-es-Salam. In: Frasseto R (ed) Proc. Impact of Sea Level Rise on Cities and Regions. Venice , Italy 11 - 13, Dec. 1989. Venice:Marsilio Editorio, pp 191-192
Klein Tank AMG, Zwiers FW, Zhang X (2009) Guidelines on analysis of extremes in a changing climate in support of informed decisions for adaptation. Climate data and monitoring WCDMP-No. 72, WMOTD No. 1500. World Meteorological Organization, Geneva, pp. 56
Kruger AC (2006) Observed trends in daily precipitation indices in South Africa: 1910–2004. Int J Climatol 26:2275–2286
Laprise R, Hernández-Díaz L, Tete K, Sushama L, Šeparoví CL, Martynov A, Winger K, Valin M (2013) Climate projections over CORDEX Africa domain using the fifth-generation Canadian Regional Climate Model (CRCM5). Clim Dyn 41:1–28
Lelieveld J, Proestos Y, Hadjinicolaou P, Tanarhte M, Tyrlis E, Zittis G (2016) Strongly increasing heat extremes in the Middle East and North Africa (MENA) in the 21st century. Clim Chang 137(1–2):245–260
Malherbe J, Engelbrecht FA, Landman WA (2013) Projected changes in tropical cyclone climatology and landfall in the Southwest Indian Ocean region under enhanced anthropogenic forcing. Clim Dyn 40:1267–1286. doi:10.1007/s00382-012-1635-2
Mason SJ, Joubert AM (1997) Simulated changes in extreme precipitation over southern Africa. Int J Climatol 17(3):291–301
Nikulin G, Jones C, Giorgi F, Asrar G, Büchner M, Cerezo-Mota R et al (2012) Precipitation climatology in an ensemble of CORDEX-Africa regional climate simulations. J Clim 25(18)
Novella NS, Thiaw W (2013) African rainfall climatology version 2 for famine early warning systems. J Appl Meteorol Climatol 52:588–606
Oguntunde PG, Abiodun BJ (2013) The impact of climate change on the Niger River Basin hydroclimatology, West Africa. Clim Dyn 40:81–94
Omotosho JB (1988) Spatial variation of rainfall in Nigeria during the ‘little dry season’. Atmos Res 22(2):137–147
Pinto I, Lennard C, Tadross M, Hewitson B, Dosio A, Nikulin G, Panitz H-J, Shongwe M (2016) Evaluation and projections of extreme precipitation over southern Africa from two CORDEX models. Clim Chang 2015:1–14. doi:10.1007/s10584-015-1573-1
Roberts CPR, Alexander WJR (1982) Lessons learnt from the 1981 Laingsburg flood. Civil Engineer in South Africa 24(1):17–21
Robinson PJ, Henderson-Sellers A (1999) Contemporary climatology. Harlow, Pearson Education Limited, p 123
Russo S, Marchese AF, Sillmann J, Immé G (2016) When will unusual heat waves become normal in a warming Africa? Environ Res Lett 11(5):054016
Schär C et al (2016) Percentile indices for assessing changes in heavy precipitation events. Clim Chang 137:201–216
Shongwe M, Van Oldenborgh G, Van Den Hurk B, De Boer B et al (2009) Projected changes in extreme precipitation in Africa under global warming. Part 1: southern Africa. J Clim 22:3819–3837
Sylla MB, Giorgi F, Coppola E, Mariotti L (2013) Uncertainties in daily precipitation over Africa: assessment of gridded observation products and evaluation of a regional climate model simulation. Int J Climatol 33(7):1805–1817
Tadross, M and Johnston, P. 2012. ICLEI—local governments for sustainability—Africa climate systems regional report: Southern Africa. Sub-Saharan African Cities: A Five-City Network to Pioneer Climate Adaptation through participatory Research and Local Action. August 2012.ISBN: 978–0–9921794-6-5
Zhang X, Zwiers FW, Hegerl GC, Lambert FH, Gillett NP, Solomon S, Stott PA, Nozawa T (2007) Detection of human influence on twentieth-century precipitation trends. Nature 448:461–465
Acknowledgements
The project was supported with grants and bursaries from the Directorate for Technical Cooperation in Africa (DTCA, Nigeria), the Future Resilience for African Cities and Lands (FRACTAL, South Africa), and the National Research Foundation (NRF, South Africa). Computing facility was provided by the Centre for High Performance Computing (CHPC, South Africa). We thank the reviewers and editor for their constructive comments, which strengthened the paper.
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Abiodun, B.J., Adegoke, J., Abatan, A.A. et al. Potential impacts of climate change on extreme precipitation over four African coastal cities. Climatic Change 143, 399–413 (2017). https://doi.org/10.1007/s10584-017-2001-5
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DOI: https://doi.org/10.1007/s10584-017-2001-5