Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081441 |
Underwater Ice Terrace Observed at the Front of Glaciar Grey, a Freshwater Calving Glacier in Patagonia | |
Sugiyama, Shin1; Minowa, Masahiro2; Schaefer, Marius2 | |
2019-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:5页码:2602-2609 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; Chile |
英文摘要 | Underwater ice geometry at the front of calving glaciers provides crucial information for calving and underwater melting. In this study, we present ice geometry captured by operating a side-scanning sonar near the front of Glaciar Grey, a freshwater calving glacier in Patagonia. The observations revealed ice projecting into the lake with a substantially different structure from that of known tidewater glaciers. Terrace-like ice structures were found at several tens of meters below the water surface and extended up to 100m from the aerial ice front. The structure depicted by the sonar was confirmed when the ice front was exposed by flotation during a major calving event. We infer that buoyant force acting on the submerged ice terrace acted as a driver of the calving event. Our study demonstrates the importance of the underwater ice geometry, which affects sizable calving at the front of freshwater calving glaciers. Plain Language Summary Glaciers terminating in lakes and the ocean are in general retreating more rapidly than glaciers on land. This is because such glaciers lose ice by discharging icebergs and melting in water. The shape of the submerged part of the ice front provides important information for understanding iceberg production and melting, but measurements near the glacier front are difficult to obtain. In this study, we used a side-scanning sonar to visualize underwater ice of a lake terminating glacier in Patagonia. The observations revealed ice jutting into the lake, forming terrace-like structures several tens of meters below the water surface. The structure was significantly different from that of ocean terminating glaciers. The observation was confirmed when the ice front was detached from the glacier and exposed by flotation. Our study demonstrates that buoyant force acting on the ice terrace plays a key role in the production of large icebergs at the front of freshwater calving glaciers. |
英文关键词 | glacier calving Patagonia freshwater calving glacier lake side-scanning sonar |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462612900030 |
WOS关键词 | COOK NATIONAL-PARK ; SUBGLACIAL DISCHARGE ; PROGLACIAL LAKES ; LECONTE GLACIER ; TASMAN GLACIER ; MASS-BALANCE ; ICEFIELD ; INVENTORY ; MELT ; RETREAT |
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/181620 |
专题 | 气候变化 |
作者单位 | 1.Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido, Japan; 2.Univ Austral Chile, Fac Ciencias, Inst Ciencias Fisi & Matemat, Valdivia, Chile |
推荐引用方式 GB/T 7714 | Sugiyama, Shin,Minowa, Masahiro,Schaefer, Marius. Underwater Ice Terrace Observed at the Front of Glaciar Grey, a Freshwater Calving Glacier in Patagonia[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(5):2602-2609. |
APA | Sugiyama, Shin,Minowa, Masahiro,&Schaefer, Marius.(2019).Underwater Ice Terrace Observed at the Front of Glaciar Grey, a Freshwater Calving Glacier in Patagonia.GEOPHYSICAL RESEARCH LETTERS,46(5),2602-2609. |
MLA | Sugiyama, Shin,et al."Underwater Ice Terrace Observed at the Front of Glaciar Grey, a Freshwater Calving Glacier in Patagonia".GEOPHYSICAL RESEARCH LETTERS 46.5(2019):2602-2609. |
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