Woody et al. (2026) Regional Analysis of Snow Presence Trends in the Northern Hemisphere

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

Identification

• Journal: Journal of Hydrometeorology
• Year: 2026
• Date: 2026-01-30
• Authors: Jonathan Woody, Penelope J. Prochnow, Jiajie Kong, Jamie L. Dyer
• DOI: 10.1175/jhm-d-25-0061.1

Research Groups

[Not specified in the provided abstract.]

Short Summary

This study statistically analyzes snow-cover trends across the Northern Hemisphere over 43 years using binary snow presence data. It reveals an overall decline in snow-covered area, a shift towards earlier snowpack generation and melt, and significant regional variations influenced by topography.

Objective

• To present a statistical analysis of snow-cover trends in the Northern Hemisphere to quantify changes in snow presence as a crucial aspect of understanding global climatic change.

Study Configuration

• Spatial Scale: Northern Hemisphere, 24 km grid cells.
• Temporal Scale: September 1980 onward, covering a 43-year study period with weekly snow cover extent data.

Methodology and Data

• Models used: Statistical analysis for trend assessment, specifically adapted for binary snow presence/absence data.
• Data sources: Rutgers Northern Hemisphere 24 km Weekly Snow Cover Extent, September 1980 Onward, Version 1 data.

Main Results

• Across the Northern Hemisphere, 9.4% of quality-controlled cells show statistically significant positive snow-cover trends, while 23.8% show statistically significant negative trends, indicating a 2.5:1 ratio of declining to increasing snow-covered area.
• Seasonally, there is a general positive trend in snow-covered area from August, peaking in early November (reflecting earlier snowpack generation), followed by negative trends beginning in March (reflecting earlier melt).
• This seasonal pattern is most pronounced in Europe and central Asia, which also exhibit general negative trends in annual snow presence.
• Increasing trends are observed in central Canada and the northern Great Plains in the United States.
• Snow trends in all regions demonstrate a clear local-scale influence from topographical patterns.
• The southern border of the seasonal snow-cover extent shows significant decreasing trends in snow presence across most locations in the Northern Hemisphere.

Contributions

• Presents a novel application of statistical analysis capable of assessing trends in binary snow presence data.
• Utilizes a recently released high-resolution data product (Rutgers Northern Hemisphere 24 km Weekly Snow Cover Extent) for a comprehensive 43-year analysis.
• Provides quantitative insights into the spatial and temporal shifts in Northern Hemisphere snow cover, including regional variations and the influence of topography.

Funding

[Not specified in the provided abstract.]

Citation

@article{Woody2026Regional,
  author = {Woody, Jonathan and Prochnow, Penelope J. and Kong, Jiajie and Dyer, Jamie L.},
  title = {Regional Analysis of Snow Presence Trends in the Northern Hemisphere},
  journal = {Journal of Hydrometeorology},
  year = {2026},
  doi = {10.1175/jhm-d-25-0061.1},
  url = {https://doi.org/10.1175/jhm-d-25-0061.1}
}