气候变化领域集成服务门户(CCPortal): Observing the subglacial hydrology network and its dynamics with a dense seismic array

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DOI	10.1073/pnas.2023757118
	Observing the subglacial hydrology network and its dynamics with a dense seismic array
	Nanni U.; Gimbert F.; Roux P.; Lecointre A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:28
英文摘要	Subglacial water flowstrongly modulates glacier basalmotion, which itself strongly influences the contributions of glaciers and ice sheets to sea level rise. However, our understanding of when and where subglacial water flow enhances or impedes glacier flow is limited due to the paucity of direct observations of subglacial drainage characteristics. Here, we demonstrate that dense seismic array observations combined with an innovative systematic seismic source location technique allows the retrieval of a two-dimensional map of a subglacial drainage system, as well as its day-to-day temporal evolution. We observe with unprecedented detail when and where subglacial water flows through a cavity-like system that enhances glacier flow versus when and where water mainly flows through a channel-like system that impedes glacier flow. Most importantly, we are able to identify regions of high hydraulic connectivity within and across the cavity and channel systems, which have been identified as having a major impact on the long-term glacier response to climate warming. Applying a similar seismicmonitoring strategy in other glacier settings, including for ice sheets, may help to diagnose the susceptibility of their dynamics to increased meltwater input due to climate warming. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Cryoseismology; Dense seismic array; Glacier; Seismic noise; Subglacial hydrology
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238688
作者单位	Institut des Géosciences de l'Environnement, Université Grenoble Alpes, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Grenoble, 38400, France; Institut des Sciences de la Terre, Université Savoie Mont Blanc, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Institut français des sciences et technologies des transports, de l'aménagement et des réseaux, Grenoble, 38400, France
推荐引用方式 GB/T 7714	Nanni U.,Gimbert F.,Roux P.,et al. Observing the subglacial hydrology network and its dynamics with a dense seismic array[J],2021,118(28).
APA	Nanni U.,Gimbert F.,Roux P.,&Lecointre A..(2021).Observing the subglacial hydrology network and its dynamics with a dense seismic array.Proceedings of the National Academy of Sciences of the United States of America,118(28).
MLA	Nanni U.,et al."Observing the subglacial hydrology network and its dynamics with a dense seismic array".Proceedings of the National Academy of Sciences of the United States of America 118.28(2021).