Achugbu et al. (2026) Irrigation effects on downwind precipitation in different synoptic conditions: a study in the U.S. Central Great Plains

Identification

• Journal: npj Climate and Atmospheric Science
• Year: 2026
• Date: 2026-06-22
• Authors: Ifeanyi Chukwudi Achugbu, Liang Chen, Qi Hu, Rezaul Mahmood
• DOI: 10.1038/s41612-026-01469-7

Research Groups

• Department of Earth and Atmospheric Science, University of Nebraska-Lincoln, Lincoln, NE, USA.
• School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, USA.

Short Summary

This study investigates the effects of irrigation on downwind precipitation in different synoptic conditions using convection-permitting WRF simulations. The results show that irrigation can enhance precipitation under transitional and strong synoptic disturbance conditions but not under quiescent conditions.

Objective

• Investigate how large-scale irrigation modifies precipitation within irrigated regions.
• Examine the impact of irrigation on downwind precipitation in different synoptic conditions.

Study Configuration

• Spatial Scale: The study focuses on the U.S. Central Great Plains region.
• Temporal Scale: The simulations are run for a period of several days to capture the effects of irrigation on precipitation.

Methodology and Data

• Models used: Convection-permitting WRF simulations.
• Data sources: Satellite, observation, and reanalysis data are used to validate the model results.

Main Results

• Irrigation can enhance precipitation under transitional and strong synoptic disturbance conditions but not under quiescent conditions.
• The LFC–LCL deficit is a key discriminating variable explaining why irrigation-induced CAPE enhancement under quiescent conditions fails to produce precipitation.
• In the transitional regime, simultaneous increases in moisture, CAPE, and reduced LFC–LCL deficit provide a physically consistent explanation for the clearer and more spatially coherent downwind precipitation enhancement.

Contributions

• This study provides new insight into irrigation impacts on precipitation and demonstrates that massive irrigation can modify the thermodynamic environment downwind areas and affect their precipitation.
• The results establish a robust and rigorous regime-dependent framework for understanding how large-scale irrigation modifies downwind hydroclimate.

Funding

• Not specified in the provided text.

Citation

@article{Achugbu2026Irrigation,
  author = {Achugbu, Ifeanyi Chukwudi and Chen, Liang and Hu, Qi and Mahmood, Rezaul},
  title = {Irrigation effects on downwind precipitation in different synoptic conditions: a study in the U.S. Central Great Plains},
  journal = {npj Climate and Atmospheric Science},
  year = {2026},
  doi = {10.1038/s41612-026-01469-7},
  url = {https://doi.org/10.1038/s41612-026-01469-7}
}