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Land-Surface Characteristics and Climate in West Africa: Models’ Biases and Impacts of Historical Anthropogenically-Induced Deforestation
Land Use Land-Cover Change (LULCC), such as deforestation, affects the climate system and land-atmosphere interactions. Using simulations carried out within the LUCID (Land Use and Climate, IDentification of robust Impacts) project framework, we first quantify the role of historical land-cover change induced by human activities on surface climate in West Africa. Focusing on two contrasted African regions, we find that climate responses of land-use changes are small but they are still statistically significant. In Western Sahel, a statistically significant near-surface atmospheric cooling and a decrease in water recycling are simulated in summer in response to LULCC. Over the Guinean zone, models simulate a significant decrease in precipitation and water recycling in autumn in response to LULCC. This signal is comparable in magnitude with the effect induced by the increase in greenhouse gases. Simulated climate changes due to historical LULCC could however be underestimated because: (i) the prescribed LULCC can be underestimated in those regions; (ii) the climate models underestimate the coupling strength between West African surface climate and leaf area index (LAI) and (iii) the lack of interactive LAI in some models. Finally, our study reveals indirect atmospheric processes triggered by LULCC. Over the Western Sahel, models reveal that a significant decrease in solar reflection tend to cool down the surface and thus counteract the atmospheric feedback. Conversely, over the Guinea zone, models reveal that the indirect atmospheric processes and turbulent heat fluxes dominate the climatic responses over the direct effects of LULCC.
550, climate change; deforestation; land use-land cover change; land-atmosphere interaction; land surface models; LUCID; West Africa, TJ807-830, LUCID, 910, land-atmosphere interaction, TD194-195, Land-atmosphere interaction, Renewable energy sources, [SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology, [ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], land use-land cover change, West Africa, Climate change, deforestation, Land use-land cover change, GE1-350, Land surface models, Deforestation, info:eu-repo/classification/ddc/550, Environmental effects of industries and plants, ddc:550, ddc:910, Environmental sciences, Earth sciences, climate change, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, land surface models
550, climate change; deforestation; land use-land cover change; land-atmosphere interaction; land surface models; LUCID; West Africa, TJ807-830, LUCID, 910, land-atmosphere interaction, TD194-195, Land-atmosphere interaction, Renewable energy sources, [SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology, [ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], land use-land cover change, West Africa, Climate change, deforestation, Land use-land cover change, GE1-350, Land surface models, Deforestation, info:eu-repo/classification/ddc/550, Environmental effects of industries and plants, ddc:550, ddc:910, Environmental sciences, Earth sciences, climate change, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, land surface models
