IAHS-AISH Scientific Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Decadal variability in long- and short-lived hydrological extremes in Sub-Saharan Africa

Job Ekolu1, Bastien Dieppois1, Jonathan Eden1, Yves Tramblay2, Gabrielle Villarini3, Gil Mahé2, Jean-Emmanuel Paturel2, and Marco van de Wiel1
Job Ekolu et al.
  • 1Centre for Agroecology, Water and Resilience (CAWR), Coventry University, Coventry, UK
  • 2HydroSciences Montpellier (HSM), Université de Montpellier – Institut de Recherche et le Dévelopment (IRD), Montpellier, France
  • 3IIHR – Hydroscience & Engineering, University of Iowa, Iowa City, Iowa, USA

Sub-Saharan Africa is affected by a high-level of temporal and spatial variability in climate, with large impacts on water resources, human lives and economies, notably through hydrological extremes, such as floods and droughts. Using a newly reconstructed 65-year daily streamflow dataset of over 600 stations distributed throughout sub-Saharan Africa, we first highlight that the frequency, intensity and duration of hydrological extremes are strongly impacted by decadal to multi-decadal variations. However, the key factors driving such decadal to multi-decadal variability remain poorly documented and understood. Thus, here, compiling information on local-scale drivers (precipitation, temperature, soil moisture) and large-scale drivers (sea-surface temperature modes of variability, such ENSO and AMO, in the different ocean basins), using relative importance analysis and multiple datasets (ERSSTv3, ERA5-land, REGEN), we investigate the respective contribution of large-scale versus regional-scale processes in driving decadal to multi-decadal variability in long-lived and short-lived flood and drought.

How to cite: Ekolu, J., Dieppois, B., Eden, J., Tramblay, Y., Villarini, G., Mahé, G., Paturel, J.-E., and van de Wiel, M.: Decadal variability in long- and short-lived hydrological extremes in Sub-Saharan Africa, IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-422, https://doi.org/10.5194/iahs2022-422, 2022.