2025-04-01 コンコルディア大学
＜関連情報＞
- https://www.concordia.ca/news/stories/2025/04/01/tree-rings-from-gaspesie-mountains-reveal-effects-of-global-warming-dating-back-almost-a-century.html
- https://www.sciencedirect.com/science/article/pii/S2214581825000539
大西洋沿岸の年輪復元ギャップを埋める： カナダ、ケベック州ガスペジ、サントアンヌ川の195年にわたる成長期流量記録 Filling the Atlantic coastal tree-ring reconstruction gap: A 195-year record of growing season discharge of the Sainte-Anne River, Gaspésie, Québec, Canada
A.V. Pace, J.-M. St-Jacques, D.D. Noel, G. Fortin
Journal of Hydrology: Regional Studies Available online: 11 February 2025
DOI:https://doi.org/10.1016/j.ejrh.2025.102229
Graphical Abstract
Highlights
- Fills gap in coastal tree-ring based river reconstructions between 41°N and 53°N.
- Adds fifth river to the four existing river basin reconstructions of Atlantic coast.
- Found decline in extreme May-July flows since 1937, hence recent snowpack decline.
- Decadal periods of below-mean MJJ flows more likely than long above-mean flows.
- Shows long-term hydrological connections all along eastern continental margin.
Abstract
Study region
We present a coastal river reconstruction between the Hudson River and north-central Québec, filling a substantial hiatus between 41° N and 53° N along the Atlantic North American margin, and adding to the four existing Atlantic coastal river basins with reconstructions.
Study focus
This study produced a 195-year tree-ring based reconstruction of growing season flow of the Sainte-Anne River, Gaspésie, Québec, Canada. Our nested reconstruction (maximum R2 = 0.53, maximum RE = 0.32) was based upon eight site chronologies where snowpack limits the length of the growing season.
New hydrological insights for the region
We found declining extreme May-July flows since 1937, suggesting a reduction of snowpack in this alpine region in the northern Appalachians. Our Gaspésie reconstruction showed droughts and pluvials in common with multi-centennial river/moisture reconstructions along the Atlantic Seaboard from New York, Delaware and Maryland and from north-central Québec. A principal components analysis (PCA) and correlation analysis with GRUN (the 5°x5° gridded multi-model ensemble of runoff of Ghiggi et al. (2019. Earth Syst. Sci. Data. 11, (1655–1674) showed common modes of variability through-out this broader region. While energy-limited tree-ring chronologies are well-known in western North America, they are poorly known in eastern North America. We found energy-limited snow proxy sites in this region noted for its high snowfall. This reconstruction may prove useful for wildlife, fisheries and hydroelectric reservoir management.
