Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL079665 |
Near-Surface Environmentally Forced Changes in the Ross Ice Shelf Observed With Ambient Seismic Noise | |
Chaput, J.1,2; Aster, R. C.3; McGrath, D.3; Baker, M.3; Anthony, R. E.4; Gerstoft, P.5; Bromirski, P.5; Nyblade, A.6; Stephen, R. A.7; Wiens, D. A.8; Das, S. B.7; Stevens, L. A.9 | |
2018-10-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:20页码:11187-11196 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Continuous seismic observations across the Ross Ice Shelf reveal ubiquitous ambient resonances at frequencies >5 Hz. These firn-trapped surface wave signals arise through wind and snow bedform interactions coupled with very low velocity structures. Progressive and long-term spectral changes are associated with surface snow redistribution by wind and with a January 2016 regional melt event. Modeling demonstrates high spectral sensitivity to near-surface (top several meters) elastic parameters. We propose that spectral peak changes arise from surface snow redistribution in wind events and to velocity drops reflecting snow lattice weakening near 0 degrees C for the melt event. Percolation-related refrozen layers and layer thinning may also contribute to long-term spectral changes after the melt event. Single-station observations are inverted for elastic structure for multiple stations across the ice shelf. High-frequency ambient noise seismology presents opportunities for continuous assessment of near-surface ice shelf or other firn environments. Plain Language Summary Ice shelves are the floating buttresses of large glaciers that extend over the oceans and play a key role in restraining inland glaciers as they flow to the sea. Deploying sensitive seismographs across Earth's largest ice shelf (the Ross Ice Shelf) for 2 years, we discovered that the shelf nearly continuously sings at frequencies of five or more cycles per second, excited by local and regional winds blowing across its snow dune-like topography. We find that the frequencies and other features of this singing change, both as storms alter the snow dunes and during a (January 2016) warming event that resulted in melting in the ice shelf's near surface. These observations demonstrate that seismological monitoring can be used to continually monitor the near-surface conditions of an ice shelf and other icy bodies to depths of several meters. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451510500045 |
WOS关键词 | PROPAGATION ; STABILITY ; FIRN ; ACCUMULATION ; SENSITIVITY ; ANTARCTICA ; CHANNEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28151 |
专题 | 气候变化 |
作者单位 | 1.Colorado State Univ, Dept Math, Ft Collins, CO 80523 USA; 2.Univ Texas El Paso, Dept Geol Sci, El Paso, TX 79968 USA; 3.Colorado State Univ, Dept Geosci, Ft Collins, CO 80523 USA; 4.US Geol Survey, Albuquerque Seismol Lab, Albuquerque, NM USA; 5.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 6.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 7.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA; 8.Dept Earth & Planetary Sci, St Louis, MO USA; 9.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Chaput, J.,Aster, R. C.,McGrath, D.,et al. Near-Surface Environmentally Forced Changes in the Ross Ice Shelf Observed With Ambient Seismic Noise[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(20):11187-11196. |
APA | Chaput, J..,Aster, R. C..,McGrath, D..,Baker, M..,Anthony, R. E..,...&Stevens, L. A..(2018).Near-Surface Environmentally Forced Changes in the Ross Ice Shelf Observed With Ambient Seismic Noise.GEOPHYSICAL RESEARCH LETTERS,45(20),11187-11196. |
MLA | Chaput, J.,et al."Near-Surface Environmentally Forced Changes in the Ross Ice Shelf Observed With Ambient Seismic Noise".GEOPHYSICAL RESEARCH LETTERS 45.20(2018):11187-11196. |
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