期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 16, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL099049
关键词
debris-covered glaciers; glacier erosion; sediment transport; alpine geomorphology; glacier dynamics; glacier modeling
资金
- SNF [PZ00P2_202024]
- ERC [851614]
- Swiss National Science Foundation (SNF) [PZ00P2_202024] Funding Source: Swiss National Science Foundation (SNF)
- European Research Council (ERC) [851614] Funding Source: European Research Council (ERC)
Debris in glaciers affects their shape and movement, reducing ice melt and potentially leading to conditions for glacier surging.
Glaciers are commonly conceptualized as bodies composed of snow and ice. Yet, many glaciers contain a substantial amount of rock, especially those abutting steep mountains. Mountain slopes erode, depositing rocks on glaciers below. This loose rock (or debris) is buried in glaciers and melts out lower down creating a debris cover. Debris cover reduces ice melt, which changes the shape and movement of glaciers. Glacier movement, specifically basal sliding, efficiently sculpts landscapes. To date, we know little about the impacts of surface debris on conditions below glaciers. To help remedy this, we run numerical model simulations which show that debris-covered glaciers erode slower than glaciers unaffected by debris. Reduced melt under surface debris lowers sliding speeds and causes sediment to accumulate at the bed, potentially establishing conditions for surging. The influence of surface debris cover on the subglacial environment may hold substantial implications for alpine sediment storage and landscape evolution.
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