What the study found
Croplands and nearby grasslands in tropical Africa show different land surface temperature patterns across the day. Croplands cool the surface at night, while daytime effects depend on how arid the region is.
Why the authors say this matters
The authors conclude that the findings provide a mechanistic understanding of how cropland expansion alters local climate across hydroclimatic gradients. They also highlight a potential risk of intensified daytime warming in less arid regions associated with cropland expansion.
What the researchers tested
The researchers quantified diurnal cycles of land surface temperature differences between croplands and nearby grasslands across tropical Africa. They used 17 years of geostationary satellite observations and a space-for-time substitution approach, and they examined biophysical mechanisms including turbulent heat fluxes, leaf area index, and surface albedo.
What worked and what didn't
Croplands consistently cooled the surface at night relative to surrounding grasslands. During daytime, temperature differences were negative in more arid regions and positive in less arid regions; analyses suggested that cropland-induced changes in turbulent heat fluxes were the main explanatory factor, mainly through differences in leaf area index. In less arid regions during the day, reduced turbulent heat fluxes were linked to surface warming, while in all other cases enhanced turbulent heat fluxes were linked to surface cooling.
What to keep in mind
The abstract does not describe specific limitations beyond the study scope. The findings are based on tropical Africa, croplands compared with nearby grasslands, and the variables and methods stated in the abstract.
Key points
- Croplands consistently cooled the surface at night relative to nearby grasslands.
- Daytime temperature effects depended on hydroclimatic conditions, especially aridity.
- Daytime cropland effects were negative in more arid regions and positive in less arid regions.
- Turbulent heat flux changes were identified as the main explanatory component of the temperature differences.
- Differences in leaf area index were described as the primary driver of those flux changes.
Disclosure
- Research title:
- Cropland affects tropical Africa’s land surface temperature differently by day and night
- Authors:
- Hao Luo, Johannes Quaas
- Institutions:
- German Centre for Integrative Biodiversity Research, Leipzig University, Leipzig University
- Publication date:
- 2026-04-02
- OpenAlex record:
- View
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