Zhang et al. (2025) Cascading Spatial Scales in the Hydrological Cycle Over Africa

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Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-08-21
• Authors: Yan Zhang, A. J. Rigden
• DOI: 10.1029/2025gl117557

Research Groups

Not specified in the provided text.

Short Summary

This study quantifies the spatial scales of precipitation, soil moisture, and vegetation across Africa from 2016 to 2023 to investigate the existence of a spatial cascading link in the hydrological cycle. The results demonstrate that spatial scales increase sequentially from precipitation to soil moisture to vegetation, with the strongest coupling observed between soil moisture and vegetation.

Objective

• To quantify and compare the spatial scales of precipitation, soil moisture (SM), and vegetation across Africa to determine if a spatial cascading link exists within the hydrological cycle.

Study Configuration

• Spatial Scale: Continental (Africa), with specific focus on semi-arid regions and unimodal rainfall regimes.
• Temporal Scale: 2016–2023.

Methodology and Data

• Models used: Not explicitly mentioned (spatial scale analysis based on temporal variation similarity).
• Data sources: Satellite-based precipitation, soil moisture (SM), and vegetation products.

Main Results

• Scale Hierarchy: Spatial scales increase sequentially in the order: Precipitation $\rightarrow$ Soil Moisture $\rightarrow$ Vegetation.
• Correlation Patterns:
  • Precipitation scales show a weak positive correlation with SM scales.
  • Precipitation scales show a moderate negative correlation with vegetation scales.
  • SM and vegetation scales remain positively coupled.
• Regional Variability: Scale coupling is more pronounced in semi-arid regions.
• Seasonal Dynamics: In unimodal regimes, the correlation between precipitation and SM scales intensifies from the onset to the peak of the rainy season, while SM-vegetation coupling weakens slightly.

Contributions

• Provides critical insights into land-atmosphere interactions across Africa by characterizing the spatial cascading link of the hydrological cycle.
• Establishes the relative spatial scales of key hydrological and biological variables on a continental scale.

Funding

Not specified in the provided text.

Citation

@article{Zhang2025Cascading,
  author = {Zhang, Yan and Rigden, A. J.},
  title = {Cascading Spatial Scales in the Hydrological Cycle Over Africa},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl117557},
  url = {https://doi.org/10.1029/2025gl117557}
}