Subglacial bathymetry and sediment layer distribution beneath the Pine Island Glacier ice shelf, West Antarctica, modeled using aerogravity and autonomous underwater vehicle data
Subglacial bathymetry and sediment layer distribution beneath the Pine Island Glacier ice shelf, West Antarctica, modeled using aerogravity and autonomous underwater vehicle data
复制标题
使用空气重力和自主水下航行器数据建模的西南极洲松岛冰川冰架下的冰下测深和沉积层分布
DOI：
10.3189/2013aog64a110
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发表时间：
2013
影响因子：
2.9
通讯作者：
R. Alley
中科院分区：
文献类型：
--
作者：
A. Muto;S. Anandakrishnan;R. Alley
摘要 近二十年来，西南极洲松岛冰川（PIG）的流速和质量损失一直在加速，部分原因是相对温暖的环极深水（CDW）输送量的增加。然而，目前，人们对决定这种海洋影响的冰架下空腔的构造和 PIG 冰架下方的河床条件仍知之甚少。在这里，我们使用空气重力数据和自动水下航行器 (AUV) 测量的海底深度来模拟 PIG 冰架下方的测深和沉积层厚度。结果表明，AUV 之前在海底山脊向陆和向海两侧发现的深盆地已大幅向北和南延伸。盆地水柱厚度在山脊向陆一侧达400-550 m，向海一侧达500-600 m。沉积物层覆盖了冰架下方的整个海底，厚度约为200-1000 m。最薄的沉积物（<200 m）发现于海底山脊的向海斜坡上，这表明前进的冰的侵蚀可能集中在地形高处的背风处。
Abstract Pine Island Glacier (PIG), West Antarctica, has been experiencing acceleration in its flow speed and mass loss for nearly two decades, driven in part by an increase in the delivery of relatively warm Circumpolar Deep Water (CDW). However, at present, the configuration of the sub-ice-shelf cavity and bed conditions beneath the PIG ice shelf that dictate such oceanic influences remain poorly understood. Here, we use aerogravity data and ocean bottom depths measured by an autonomous underwater vehicle (AUV) to model the bathymetry and sediment layer thickness beneath the PIG ice shelf. Results reveal that the deep basins, previously found by AUV on both landward and seaward sides of a submarine ridge, extend substantially to the north and south. The water column thickness of the basins reaches 400-550 m on the landward side of the ridge and 500-600 m on the seaward side. The sediment layer covers the whole expanse of the seabed beneath the ice shelf, and the thickness is in the range ∼200-1000 m. The thinnest sediments (<200 m) are found on the seaward slope of the submarine ridge, suggesting that erosion by advancing ice may have been concentrated in the lee of the topographic high.
影响因子：
5.3
作者：
I. Filina;D. Blankenship;M. Thoma;V. Lukin;V. N. Masolov;Mrinal K. Sen
通讯作者：
I. Filina;D. Blankenship;M. Thoma;V. Lukin;V. N. Masolov;Mrinal K. Sen