Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL083980 |
Distinct Frontal Ablation Processes Drive Heterogeneous Submarine Terminus Morphology | |
Fried, M. J.1,2; Carroll, D.3,4; Catania, G. A.2,5; Sutherland, D. A.6; Stearns, L. A.7; Shroyer, E. L.8; Nash, J. D.8 | |
2019-11-03 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | Calving and submarine melt drive frontal ablation and sculpt the ice face of marine-terminating glaciers. However, there are sparse observations of submarine termini, which limit estimates of spatially varying submarine melt. Here we present a detailed survey of a west Greenland glacier to reveal heterogeneity in submarine terminus morphology. We find that the majority of the terminus (similar to 77%) is undercut, driven by calving in the upper water column and submarine melting at depth. The remaining similar to 23% of the terminus is overcut, driven by calving alone. We use observations of six subglacial discharge outlets, combined with a plume model, to estimate spatially varying discharge fluxes. While small discharge fluxes (<43 m(3)/s) feed numerous, deeply undercut outlets with subsurface plumes, similar to 70% of the net subglacial flux emerges at the terminus center, producing a vigorous, surface-reaching plume. This primary outlet drives large, localized seasonal retreat that exceeds calving rates at secondary outlets. Plain Language Summary Using a sensor to map the shape of a glacier terminus below sea level, we are able to quantify how the terminus shape changes across the glacier. This allows us to identify different classes of terminus shape, which vary from undercut to overcut. Undercut regions are formed through melting focused near the base of the terminus, where freshwater emerges from discrete channels. Using a model, we explain the degree of undercutting found in channels by varying the flux of freshwater emerging from each channel. This allows us to understand the relative role of small channels on total terminus melt compared to much larger, more frequently observed channels. We find that small channels produce significant melting compared to a much larger channel at the glacier center but not as much iceberg calving. |
英文关键词 | ice-ocean processes buoyant-plume melt glacier terminus outlet glacier |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493702100001 |
WOS关键词 | SUBGLACIAL DISCHARGE ; TIDEWATER GLACIER ; SEASONAL VARIABILITY ; MELTWATER PLUMES ; LECONTE GLACIER ; GREENLAND ; MELT ; DYNAMICS ; RETREAT ; WATERS |
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/188219 |
专题 | 气候变化 |
作者单位 | 1.ICF, Washington, DC USA; 2.Univ Texas Austin, Inst Geophys, Austin, TX 78712 USA; 3.San Jose State Univ, Moss Landing Marine Labs, San Jose, CA 95192 USA; 4.CALTECH, Jet Prop Lab, Pasadena, CA USA; 5.Univ Texas Austin, Dept Geol, Austin, TX 78712 USA; 6.Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA; 7.Univ Kansas, Dept Geol, Lawrence, KS 66045 USA; 8.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Fried, M. J.,Carroll, D.,Catania, G. A.,et al. Distinct Frontal Ablation Processes Drive Heterogeneous Submarine Terminus Morphology[J]. GEOPHYSICAL RESEARCH LETTERS,2019. |
APA | Fried, M. J..,Carroll, D..,Catania, G. A..,Sutherland, D. A..,Stearns, L. A..,...&Nash, J. D..(2019).Distinct Frontal Ablation Processes Drive Heterogeneous Submarine Terminus Morphology.GEOPHYSICAL RESEARCH LETTERS. |
MLA | Fried, M. J.,et al."Distinct Frontal Ablation Processes Drive Heterogeneous Submarine Terminus Morphology".GEOPHYSICAL RESEARCH LETTERS (2019). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论