Escobar et al. (2026) Mapping Water Scarcity and Aridity Trends in U.S. Drought Hotspots: Observed Patterns and CMIP6 Projections

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Water
• Year: 2026
• Date: 2026-04-05
• Authors: Mario Escobar, Vinay Kumar, M. M. Hurwitz
• DOI: 10.3390/w18070873

Research Groups

The paper text does not explicitly list specific research groups, labs, or departments involved.

Short Summary

This study investigates the spatial and temporal patterns of aridity and water scarcity across 111 drought-prone stations in the U.S. over 30 years, revealing a distinct west-east aridity gradient and projecting divergent future precipitation trends under global warming scenarios.

Objective

• To examine the spatial and temporal patterns of aridity and water scarcity across drought-prone stations and regions of the U.S.

Study Configuration

• Spatial Scale: 111 drought-prone weather stations and regions across the United States.
• Temporal Scale: 30 years (1991–2020) for aridity and water scarcity patterns; 20 years (2000–2019) for drought frequency analysis; 101 years (1920–2020) for long-term precipitation trends; future projections under 2 °C and 4 °C global warming scenarios.

Methodology and Data

• Models used: CMIP6 multi-model ensemble projections.
• Data sources: Precipitation records from xmACIS II.

Main Results

• A distinct west–east aridity gradient was observed across the U.S.: arid (<254 mm/year) and semi-arid (254–508 mm/year) conditions prevail across the western and central U.S., while eastern regions remain largely non-arid (>508 mm/year).
• Drought frequency analysis (2000–2019) indicated that certain regions experienced exceptional drought conditions (D3 or higher) for more than 50% of the study period.
• Localized areas endured over 300 weeks of extreme drought.
• Long-term precipitation trends (1920–2020) in Texas, Washington, and South Dakota showed a modest increase in precipitation.
• CMIP6 multi-model ensemble projections under 2 °C and 4 °C warming scenarios suggest divergent future trajectories, with some regions experiencing increased wetness while others face progressive drying.

Contributions

• Provides actionable insights for drought monitoring and climate adaptation strategies.
• Underscores the heightened vulnerability of arid and semi-arid zones to intensified water scarcity under future climate change.

Funding

The paper text does not explicitly mention any specific funding projects, programs, or reference codes.

Citation

@article{Escobar2026Mapping,
  author = {Escobar, Mario and Kumar, Vinay and Hurwitz, M. M.},
  title = {Mapping Water Scarcity and Aridity Trends in U.S. Drought Hotspots: Observed Patterns and CMIP6 Projections},
  journal = {Water},
  year = {2026},
  doi = {10.3390/w18070873},
  url = {https://doi.org/10.3390/w18070873}
}