Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hess-2016-152
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
06 Apr 2016
Review status
A revision of this discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
Simulated Hydrologic Response to Projected Changes in Precipitation and Temperature in the Congo River Basin
Noel Aloysius1 and James Saiers2 1Department of Food Agriculture & Biological Engineering and Department of Ecology, Evolution and Organismal Biology, Ohio State University, Columbus, Ohio, USA
2School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, USA
Abstract. Assessing the impacts of climate change on water resources of the Congo River Basin (CRB) has attracted widespread interest; however, efforts are hindered by the lack of long-term data availability. Of particular interest to water resource planners and policy makers is the spatiotemporal variability of runoff due to the projected changes in climate. Here, with the aid of a spatially explicit hydrological model forced with precipitation and temperature projections from 25 global climate models (GCMs) under two greenhouse gas emission scenarios, we elucidate the variability in runoff in the near (2016–2035) and mid (2046–2065) 21st century compared to present. Over the equatorial, northern and southwestern CRB, models project an overall increase in precipitation and, subsequently runoff. A decrease in precipitation in the headwater regions of southeastern Congo, leads to a decline in runoff. Climate model selection plays an important role in precipitation projections, for both magnitude and direction of change. Model consensus on the magnitude and the sign (increase or decrease) of change is strong in the equatorial and northern parts of the basin, but weak in the southern basin. The multi-model approach reveals that near-term projections are not impacted by the emission scenarios. However, the mid-term projections depend on the emission scenario. The projected increase in accessible runoff (excluding flood runoff) in most parts of CRB presents new opportunities for augmenting human appropriation of water resources; at the same time, the increase in quick runoff poses new challenges. In the southeast, with the projected decrease, the challenge will be on managing the increasing demands with limited water resources.

Citation: Aloysius, N. and Saiers, J.: Simulated Hydrologic Response to Projected Changes in Precipitation and Temperature in the Congo River Basin, Hydrol. Earth Syst. Sci. Discuss., doi:10.5194/hess-2016-152, in review, 2016.
Noel Aloysius and James Saiers
Noel Aloysius and James Saiers
Noel Aloysius and James Saiers

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Short summary
With the aid of a hydrological model and outputs from Global Climate Models (GCM), we elucidate the spatiotemporal variability of rainfall-runoff in the Congo River Basin in the past and in the future under multiple greenhouse gas emission scenarios. We show that the hydrologic model that is forced with outputs from 25 GCMs and two emission scenarios reveal a range of projected changes in precipitation and runoff, and that runoff dynamics are highly sensitive to GCM-forcing.
With the aid of a hydrological model and outputs from Global Climate Models (GCM), we elucidate...
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