Progressive unpinning of Thwaites Glacier from newly identified offshore ridge: Constraints from aerogravity
Progressive unpinning of Thwaites Glacier from newly identified offshore ridge: Constraints from aerogravity
复制标题
思韦茨冰川从新发现的近海山脊逐渐脱离：空气重力的限制
DOI：
10.1029/2011gl049026
复制
发表时间：
2011
影响因子：
5.2
通讯作者：
R. Bell
中科院分区：
文献类型：
--
作者：
K. Tinto;R. Bell
一个新的测深模型从思韦茨冰川地区的冰桥航空重力数据的基础上定义的形态特征，发挥关键控制冰流的演变。在现今的接地线前方40公里处发现了一个有两个明显山峰的突出山脊，在海平面以下300-700米之间起伏，平均起伏700米。目前，斯韦茨冰架被钉在东峰上。在过去，更广泛的固定将限制整个斯韦茨冰川系统宽度的浮冰流动。以目前的变薄速度，冰在55-150年前就与山脊的西部失去了联系，允许浮冰无限制流动，并导致了斯韦茨冰川今天的质量不平衡。水深模型还揭示了在冰川移动最快的接地线的一个弯曲处下面有一个1200米深的槽。这个新定义的槽标志着最低的地形路径伯德冰下盆地，最有可能的路径，为未来的接地线撤退。
A new bathymetric model from the Thwaites Glacier region based on IceBridge airborne gravity data defines morphologic features that exert key controls on the evolution of the ice flow. A prominent ridge with two distinct peaks has been identified 40 km in front of the present‐day grounding line, undulating between 300–700 m below sea level with an average relief of 700 m. Presently, the Thwaites ice shelf is pinned on the eastern peak. More extensive pinning in the past would have restricted flow of floating ice across the full width of the Thwaites Glacier system. At present thinning rates, ice would have lost contact with the western part of the ridge between 55–150 years ago, allowing unconfined flow of floating ice and contributing to the present‐day mass imbalance of Thwaites Glacier. The bathymetric model also reveals a 1200 m deep trough beneath a bight in the grounding line where the glacier is moving the fastest. This newly defined trough marks the lowest topographic pathway to the Byrd Subglacial Basin, and the most likely path for future grounding line retreat.
影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik