2026-04-28T13:55:11Zhttps://www.radar-service.eu/oai/OAIHandler

10.35097/4372025-10-21T06:07:00ZIMKradar4kit

10.35097/437 Rahimi, Jaber Jaber Rahimi 0000-0002-2754-2358 Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Ago, Expedit Evariste Expedit Evariste Ago Laboratoire d’Ecologie Appliquée, Faculté des Sciences Agronomiques, Université d’Abomey-Calavi, Cotonou, Bénin Ayantunde, Augustine Augustine Ayantunde International Livestock Research Institute (ILRI), Ouagadougou, Burkina Faso Bogaert, Jan Jan Bogaert Biodiversity and Landscape Unit, Université de Liège Gembloux Agro-Bio Tech, Gembloux, Belgium Butterbach-Bahl, Klaus Klaus Butterbach-Bahl 0000-0001-9499-6598 Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Cappelaere, Bernard Bernard Cappelaere 0000-0001-8533-1164 HydroSciences Montpellier, Univ. Montpellier, IRD, CNRS, Montpellier, France Demarty, Jérôme Jérôme Demarty HydroSciences Montpellier, Univ. Montpellier, IRD, CNRS, Montpellier, France Diouf, Abdoul Aziz Abdoul Aziz Diouf Centre de Suivi Ecologique (CSE), Dakar, Senegal Falk, Ulrike Ulrike Falk 0000-0003-1586-1295 Satellite-based Climate Monitoring, Deutscher Wetterdienst (DWD), Offenbach, Germany Haas, Edwin Edwin Haas 0000-0003-0664-642X Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Hiernaux, Pierre Pierre Hiernaux Géosciences Environnement Toulouse (GET), CNRS, IRD, UPS, Toulouse, France Kraus, David David Kraus 0000-0003-2485-8389 Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Roupsard, Olivier Olivier Roupsard 0000-0002-1319-142X CIRAD, UMR Eco&Sols, BP1386, CP18524, Dakar, Senegal Scheer, Clemens Clemens Scheer Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Srivastava, Amit Kumar Amit Kumar Srivastava Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany Tagesson, Torbern Torbern Tagesson Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark Grote, Rüdiger Rüdiger Grote https://orcid.org/0000-0001-6893-6890 Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Karlsruhe Institute of Technology (KIT) 2021 2021 Geological Science Environmental Science and Ecology Gas exchange, biomass production, West Africa, LandscapeDNDC, Open Access Creative Commons Attribution No Derivatives 4.0 International Karlsruhe Institute of Technology (KIT) West African Sahelian and Sudanian ecosystems are providing essential services to people and also play a significant role within the global carbon cycle. However, climate and land use are dynamically changing and it remains uncertain how these changes will affect the potential of these regions for providing food and fodder resources or the biosphere-atmosphere exchange of CO2. In this study, we investigate the capacity of a process-based biogeochemical model, LandscapeDNDC, to simulate net ecosystem exchange (NEE) and aboveground biomass of typical managed and natural Sahelian and Sudanian savanna ecosystems. We tested the model for various sites with different proportions of trees and grasses, as well as for the most typical arable cropping systems of the region. In order to describe the phenological development with a common parameterization across all ecosystem types, we introduced soil-water availability in addition to temperature as a driver as seasonal soil water-shortage is a common feature for all these systems. The new approach was tested by using a sample of sites (calibration sites) that provided NEE from flux tower observations and leaf area index data from satellite images (MODIS). For assessing the simulation accuracy, we applied the calibrated model to 42 additional sites (validation sites) across West Africa for which measured aboveground biomass data were available. The model showed a good performance regarding simulated biomass development. Overall, the comparison of simulated and observed biomass at sites with a dominating land cover of crops, grass or trees yielded correlation coefficients of 0.82, 0.94, and 0.77 and the Root Mean Square Error of 0.15, 0.22, and 0.12 kg m−2, respectively. In absolute terms, the model results indicate above-ground carbon stocks up to 1733, 3291, and 5377 kg C ha−1 yr−1 for agricultural, savanna grasslands, and savanna mixed tree-grassland sites. Carbon stocks as well as exchange rates correlated in particular with the abundance of trees. The simulations indicate higher grass biomass and crop yields under more humid climatic conditions as can be found in the Sudanian savanna region. Our study shows the capability of LandscapeDNDC to accurately simulate carbon balances in natural and agricultural ecosystems in semi-arid West Africa under a wide range of conditions, so that it might be used to assess the impact of land-use and climate change on the regional biomass productivity. The authors are thankful to the UPSCALERS project (AURG II-1-074-2016) which is part of the African Union Research Grants financed through the Agreement between the European Commission and the African Union Commission (DCI-PANAF/2015/307-078), to the EU-Aid funded project CASSECS, and to the AMMA-CATCH observatory (http://www.amma-catch.org/?lang=en) that all supplied basic data. Special funding was supplied by the Swedish National Space Agency (SNSA). Furthermore, part of the climate data was obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program. en https://doi.org/10.5194/gmd-2020-417 African Union Research Grant DCI-PANAF/2015/307-078 AURG II-1-074-2016 UPSCALERS 6,8 MB application/x-tar