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首页> 外文期刊>Journal of Glaciology >Evidence of rapid subglacial water piracy under Whillans Ice Stream, West Antarctica
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Evidence of rapid subglacial water piracy under Whillans Ice Stream, West Antarctica

机译：南极西部Whillans冰流下冰河下快速海盗行为的证据

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摘要

The subglacial water system of lower Whillans Ice Stream on the Siple Coast, West Antarctica, contains numerous connected subglacial lakes in three hydrological basins (northern, central and southern). We use Ice, Cloud and land Elevation Satellite (ICESat) data to derive estimates of lake volume change and regional thickness changes. By combining these results with a water budget model, we show that a uniform, localized thickness increase perturbed the hydropotential, resulting in a change in course of a major flow path within the system in 2005. Water originating from upper Whillans and Kamb Ice Streams that previously supplied the southern basin became diverted toward Subglacial Lake Whillans (SLW). This diversion led to a tenfold filling rate increase of SLW. Our observation suggests that water piracy may be common in the Siple Coast region, where the gentle basal relief makes the basal hydropotential particularly sensitive to small changes in ice thickness. Given the previously inferred connections between water piracy and ice-stream slowdown elsewhere in the region, the subtle and complex nature of this system presents new challenges for numerical models.
机译：南极西部Siple海岸Whillans冰河下游的冰下水系统在三个水文盆地（北部，中部和南部）中包含许多相连的冰下湖。我们使用冰，云和陆地高程卫星（ICESat）数据得出对湖泊体积变化和区域厚度变化的估计。通过将这些结果与水预算模型相结合，我们发现均匀的局部厚度增加会扰动水势，从而导致2005年系统内主要流动路径的变化。水源于Whillans上游和Kamb冰河先前供应的南部盆地变成了向西冰川湖Whillans（SLW）转移。这种转移导致SLW的填充率提高了十倍。我们的观察结果表明，在Siple Coast地区，海盗行为可能很普遍，那里温和的基底浮雕使基底水势对冰厚度的微小变化特别敏感。鉴于先前推断出的该地区其他地区的水盗版与冰流放缓之间的联系，该系统的微妙而复杂的性质为数值模型提出了新的挑战。

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