Hydrologic Properties of a Highly Permeable Firn Aquifer in the Wilkins Ice Shelf, Antarctica
Hydrologic Properties of a Highly Permeable Firn Aquifer in the Wilkins Ice Shelf, Antarctica
复制标题
南极洲威尔金斯冰架高渗透性冷杉含水层的水文特性
DOI：
10.1029/2020gl089552
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
L. Koenig
中科院分区：
文献类型：
--
作者：
L. Montgomery;C. Miège;Julie Z. Miller;T. Scambos;B. Wallin;O. Miller;D. Solomon;R. Forster;L. Koenig
我们对威尔金斯冰架内南极洲广泛分布的含铁含水层的密度、水力导电性和比流量进行了测量。在现场，含水层厚度为16.2 m，从距雪面13.4 m处开始，在距雪面29.6 m处从水饱和层过渡到冰层。段塞测试得出的水力导电性几何平均值为1.4±1.2 × 10−4 m s−1，相当于2.6±2.2 × 10−11 m2的渗透率。钻孔稀释试验表明，平均比流量为1.9±2.8 × 10−6 m s−1。探地雷达剖面和地下水流动模型显示，该含水层正在横向排水，流入附近的一个大裂谷。我们的研究结果表明，现场附近的坚硬含水层可能不处于稳定状态，它的存在可能导致了过去冰架的不稳定。
We present measurements of the density, hydraulic conductivity, and specific discharge of a widespread firn aquifer in Antarctica, within the Wilkins Ice Shelf. At the field site, the aquifer is 16.2 m thick, starting at 13.4 m from the snow surface and transitioning from water‐saturated firn to ice at 29.6 m. Hydraulic conductivity derived from slug tests show a geometric mean value of 1.4 ± 1.2 × 10−4 m s−1, equivalent to permeability of 2.6 ± 2.2 × 10−11 m2. A borehole dilution test indicates an average specific discharge value of 1.9 ± 2.8 × 10−6 m s−1. Ground‐penetrating radar profiles and a groundwater flow model show the aquifer is draining laterally into a large nearby rift. Our findings indicate that the firn aquifer in the vicinity of the field site is likely not in a steady state and its presence likely contributed to past ice shelf instability.
影响因子：
30.7
作者：
Bell, Robin E.;Banwell, Alison F.;Kingslake, Jonathan
通讯作者：
Kingslake, Jonathan
影响因子：
5.2
作者：
Howat, Ian M.;Porter, Claire;Morin, Paul
通讯作者：
Morin, Paul