Thin and ephemeral snow shapes melt and runoff dynamics in the Peruvian Andes.

IF 8.9 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Communications Earth & Environment Pub Date : 2025-01-01 Epub Date: 2025-06-05 DOI:10.1038/s43247-025-02379-x
Catriona L Fyffe, Emily Potter, Evan Miles, Thomas E Shaw, Michael McCarthy, Andrew Orr, Edwin Loarte, Katy Medina, Simone Fatichi, Rob Hellström, Michel Baraer, Emilio Mateo, Alejo Cochachin, Matthew Westoby, Francesca Pellicciotti
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引用次数: 0

Abstract

The snow and glaciers of the Peruvian Andes provide vital water supplies in a region facing water scarcity and substantial glacier change. However, there remains a lack of understanding of snow processes and quantification of the contribution of melt to runoff. Here we apply a distributed glacio-hydrological model over the Rio Santa basin to disentangle the role of the cryosphere in the Andean water cycle. Only at the highest elevations (>5000 m a.s.l.) is the snow cover continuous; at lower elevations, the snowpack is thin and ephemeral, with rapid cycles of snowfall and melt. Due to the large catchment area affected by ephemeral snow, its contribution to catchment inputs is substantial (23% and 38% in the wet and dry season, respectively). Ice melt is crucial in the mid-dry season (up to 44% of inputs). Our results improve estimates of water fluxes and call for further process-based modelling across the Andes.

秘鲁安第斯山脉的薄而短暂的雪形状融化和径流动力学。
秘鲁安第斯山脉的雪和冰川为这个面临水资源短缺和大量冰川变化的地区提供了至关重要的水供应。然而,对积雪过程和融水对径流贡献的量化仍然缺乏了解。在这里,我们应用了一个分布在b里约热内卢Santa盆地的冰川-水文模型来解开冰冻圈在安第斯水循环中的作用。只有在海拔最高的地方(平均海拔5000米左右),积雪才会持续;在低海拔地区,积雪薄而短暂,降雪和融化的周期很快。由于受短暂性降雪影响的集水区面积很大,其对集水区投入的贡献很大(湿季和干季分别为23%和38%)。冰融化在旱季中期至关重要(高达44%的投入)。我们的研究结果改进了对水通量的估计,并呼吁在整个安第斯山脉进一步建立基于过程的模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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