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Sharpening of cold-season storms over the western United States

Author

Listed:
  • Xiaodong Chen

    (Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory)

  • L. Ruby Leung

    (Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory)

  • Yang Gao

    (Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory
    Ocean University of China)

  • Ying Liu

    (Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory)

  • Mark Wigmosta

    (Energy and Environment Directorate, Pacific Northwest National Laboratory)

Abstract

Winter storms are responsible for billion-dollar economic losses in the western United States. Because storm structures are not well resolved by global climate models, it is not well established how single events and their structures change with warming. Here we use regional storm-resolving simulations to investigate climate change impact on western US winter storms. Under a high-emissions scenario, precipitation volume from the top 20% of winter storms is projected to increase by up to 40% across the region by mid-century. The average increase in precipitation volume (31%) is contributed by 22% from increasing area coverage and 19% from increasing storm intensity, while a robust storm sharpening with larger increase in storm centre precipitation compared with increase in storm area reduces precipitation volume by 10%. Ignoring storm sharpening could result in overestimation of the changes in design storms currently used in infrastructure planning in the region.

Suggested Citation

  • Xiaodong Chen & L. Ruby Leung & Yang Gao & Ying Liu & Mark Wigmosta, 2023. "Sharpening of cold-season storms over the western United States," Nature Climate Change, Nature, vol. 13(2), pages 167-173, February.
    • Handle: RePEc:nat:natcli:v:13:y:2023:i:2:d:10.1038_s41558-022-01578-0
    DOI: 10.1038/s41558-022-01578-0
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