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Legacy of snow cover on alpine landscapes
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Journal Article
Legacy of snow cover on alpine landscapes
2025
Overview
Over the past four decades, seasonal snow cover has declined rapidly in temperate alpine regions. However, the fine-scale dynamics of snowmelt preceding the ongoing warming period remain largely unknown, limiting our understanding of the long-term influence of past snow cover on alpine ecosystems. Here we rely upon the spatial similarities in melt-out patterns and a temperature-based model of fractional snow cover area, to reconstruct fine-scale snow cover changes over the past 250 years in instrumented catchments of the southwestern Alps. We provide evidence that, until the 1980s, prolonged snow cover in many late-lying snowfields delayed ecosystem development and explain why current vegetation cover, soil organic matter content, and mineral weathering are significantly lower in these areas than in surrounding ecosystems. These findings highlight the long-term legacy of snow cover on alpine landscapes and underscore the need to re-evaluate its effects on ecosystem structure, functioning, and responsiveness to ongoing changes.
Prolonged snow cover in the southwestern Alps delayed ecosystem development until the 1980s, with current incipient soils and sparse vegetation reflecting a lagged response to recent warming rather than equilibrium with present conditions, as revealed by reconstructing fine-scale snow cover changes over the past 250 years.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Nature,Nature Portfolio
Subject
