2026-02-09 ミシガン大学
＜関連情報＞
- https://news.umich.edu/discovering-new-connections-between-great-lakes-winter-storms-and-global-climate-patterns/
- https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JD045180
五大湖の温帯低気圧の特徴と地球規模のテレコネクションの関係 Relationships Between Great Lakes Extratropical Cyclone Characteristics and Global Teleconnections
Abby Hutson, Jamie L. Ward, Ayumi Fujisaki-Manome, Dani Jones, Sydnie Hansen
Journal of Geophysical Research: Atmospheres Published:21 January 2026
DOI:https://doi.org/10.1029/2025JD045180
Abstract
The Great Lakes Region sits at the intersection of multiple North American storm tracks. During the cold season (October–March), the regional weather is dominated by extratropical cyclone activity. While these Great Lakes extratropical cyclones (GL ETCs) are getting warmer and holding more moisture with time, there is considerable interannual variability in storm characteristics. To better understand cold-season variability, this study investigates the correlations between GL ETC thermodynamic characteristics and different global teleconnection patterns. Using a database of 886 cyclones identified in ERA5 data, we find that while there is no correlation between teleconnection indices and the number of GL ETCs each year, the Pacific North American and North Pacific Gyre Oscillation (NPGO) indices are significantly correlated with the moisture content in GL ETCs, and the North American Oscillation is correlated with ETC temperature. The Arctic Oscillation is correlated with all thermodynamic characteristics in GL ETCs. Additionally, the relationships between GL ETCs and teleconnection indices are shifting with time, and some teleconnections, like the NPGO, may become more influential to Great Lakes weather in the future.
Plain Language Summary
In the Great Lakes Region, cold-season weather and its variability is dominated by large storm systems known as extratropical cyclones. The temperature of the airmasses and moisture contained in these storm systems varies from year to year, and from storm to storm. Global climate-scale patterns, defined using teleconnection indices, are known to affect storm variability. This study finds significant correlations between global teleconnection indices and weather characteristics in Great Lakes storms, which may help us better understand seasonal winter extremes in Great Lakes temperature and precipitation.
Key Points
- Individual teleconnection indices are correlated with specific characteristics of extratropical cyclones (ETCs) that impact the Great Lakes Region (GLR)
- Teleconnection phase does not affect the number of ETCs entering the GLR
- The relationship between individual teleconnection phases and Great Lakes extratropical cyclones is not stationary with time
