Journal cover Journal topic
Earth System Science Data The Data Publishing Journal
Earth Syst. Sci. Data, 10, 815-835, 2018
https://doi.org/10.5194/essd-10-815-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
23 Apr 2018
The WASCAL high-resolution regional climate simulation ensemble for West Africa: concept, dissemination and assessment
Dominikus Heinzeller1,a, Diarra Dieng1,2, Gerhard Smiatek1, Christiana Olusegun1, Cornelia Klein3, Ilse Hamann4, Seyni Salack5, Jan Bliefernicht2, and Harald Kunstmann1,2 1Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Garmisch-Partenkirchen, Germany
2University of Augsburg, Institute of Geography, Augsburg, Germany
3Centre for Ecology & Hydrology, Wallingford, UK
4German Climate Computing Center, Hamburg, Germany
5WASCAL Competence Center, Ouagadougou, Burkina Faso
anow at: University of Colorado Boulder, Cooperative Institute for Research in Environmental Sciences, NOAA/OAR/ESRL/Global Systems Division, Boulder, CO, USA
Abstract. Climate change and constant population growth pose severe challenges to 21st century rural Africa. Within the framework of the West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), an ensemble of high-resolution regional climate change scenarios for the greater West African region is provided to support the development of effective adaptation and mitigation measures. This contribution presents the overall concept of the WASCAL regional climate simulations, as well as detailed information on the experimental design, and provides information on the format and dissemination of the available data. All data are made available to the public at the CERA long-term archive of the German Climate Computing Center (DKRZ) with a subset available at the PANGAEA Data Publisher for Earth & Environmental Science portal (https://doi.pangaea.de/10.1594/PANGAEA.880512). A brief assessment of the data are presented to provide guidance for future users.

Regional climate projections are generated at high (12 km) and intermediate (60 km) resolution using the Weather Research and Forecasting Model (WRF). The simulations cover the validation period 1980–2010 and the two future periods 2020–2050 and 2070–2100. A brief comparison to observations and two climate change scenarios from the Coordinated Regional Downscaling Experiment (CORDEX) initiative is presented to provide guidance on the data set to future users and to assess their climate change signal. Under the RCP4.5 (Representative Concentration Pathway 4.5) scenario, the results suggest an increase in temperature by 1.5 °C at the coast of Guinea and by up to 3 °C in the northern Sahel by the end of the 21st century, in line with existing climate projections for the region. They also project an increase in precipitation by up to 300 mm per year along the coast of Guinea, by up to 150 mm per year in the Soudano region adjacent in the north and almost no change in precipitation in the Sahel. This stands in contrast to existing regional climate projections, which predict increasingly drier conditions.

The high spatial and temporal resolution of the data, the extensive list of output variables, the large computational domain and the long time periods covered make this data set a unique resource for follow-up analyses and impact modelling studies over the greater West African region. The comprehensive documentation and standardisation of the data facilitate and encourage their use within and outside of the WASCAL community.

Citation: Heinzeller, D., Dieng, D., Smiatek, G., Olusegun, C., Klein, C., Hamann, I., Salack, S., Bliefernicht, J., and Kunstmann, H.: The WASCAL high-resolution regional climate simulation ensemble for West Africa: concept, dissemination and assessment, Earth Syst. Sci. Data, 10, 815-835, https://doi.org/10.5194/essd-10-815-2018, 2018.
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Short summary
Climate change and population growth pose severe challenges to 21st century rural Africa. Within the framework of the West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), an ensemble of high-resolution regional climate change simulations is provided to support adaptation and mitigation measures. This contribution presents the concept and design of the simulations and provides information on the format and dissemination of the available data.
Climate change and population growth pose severe challenges to 21st century rural Africa. Within...
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