|
| Simulation | Simulation | Simulation | Hydrologic network of greenbelt modules, |
| Reforestation area assumption
| Sahara-Sahel Interface Area: 5 latitudes of Sahel, coast to coast, ca. 2.6 million km2 total area | 4 latitudes across semi-arid Sahel savanna ca. 2000 km length, ca. 0.88 million km2 total area | Northern Sahel Area: 1.76 latitudes coast to coast, ca. 0.92 million km2 total area | Network of existing vegetation and new connective modules (25% trees, 75% grassland). Example: Original vegetation: 10%, connective modules: 20% |
| Vegetation cover % | 100% fields and forests | 100% forest | 100% forest | Example: 30% total vegetation cover |
| Composition of vegetation | 100% crops and trees | 100% trees—evergreen broad leafed | 100% trees— deciduous needle leaf | Example: 10% original vegetation, planting of 5% native shrubs/trees, 15% grassland as natural succession within modules |
| Expected reduction in albedo | High: high tree and crop plant cover | Very high: high tree cover, evergreen nature | Very high: high tree cover, evergreen nature | Low: low number of woody plants, native savanna plants reflecting radiation, light color during nine months of dry season |
| Extreme temperature (T) days, Risk of heatwaves | Risk of extreme T in Central Sahel. Heatwaves increased during summer, decreased in winter | Frequency and duration of heat wave events increased over forested area (Savanna in W Africa) | T max, warm days, and risk of heatwaves increased over forested area | Additional 20% savanna like vegetation will add 5% of native woody plants. More balanced T in restoration area, fewer days of hot dry desert wind, local increase in RH and SMC |
| Extreme rainfall, Risk of flooding | Extreme precipitation, flooding |
| Extreme rainfalls, risk of flooding | Not likely: Savanna with low tree cover, plants adjusted to dry season; compartments |