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Recent understanding of Antarctic supraglacial lakes using satellite remote sensing
Progress in Physical Geography: Earth and Environment ( IF 3.9 ) Pub Date : 2020-05-19 , DOI: 10.1177/0309133320916114
Jennifer F Arthur 1 , Chris Stokes 1 , Stewart SR Jamieson 2 , J Rachel Carr 3 , Amber A Leeson 4
Affiliation  

Supraglacial lakes (SGLs) are now known to be widespread in Antarctica, where they represent an important component of ice sheet mass balance. This paper reviews how recent progress in satellite remote sensing has substantially advanced our understanding of SGLs in Antarctica, including their characteristics, geographic distribution and impacts on ice sheet dynamics. Important advances include: (a) the capability to resolve lakes at sub-metre resolution at weekly timescales; (b) the measurement of lake depth and volume changes at seasonal timescales, including sporadic observations of lake drainage events and (c) the integration of multiple optical satellite datasets to obtain continent-wide observations of lake distributions. Despite recent progress, however, there remain important gaps in our understanding, most notably: (a) the relationship between seasonal variability in SGL development and near-surface climate; (b) the prevalence and impact of SGL drainage events on both grounded and floating ice and (c) the sensitivity of individual ice shelves to lake-induced hydrofracture. Given that surface melting and SGL development is predicted to play an increasingly important role in the surface mass balance of Antarctica, bridging these gaps will help constrain predictions of future rapid ice loss from Antarctica.

中文翻译:

利用卫星遥感对南极冰上湖泊的最新认识

现在已知冰上湖 (SGLs) 在南极洲普遍存在,它们是冰盖质量平衡的重要组成部分。本文回顾了卫星遥感的最新进展如何大大提高了我们对南极洲 SGL 的理解,包括它们的特征、地理分布和对冰盖动力学的影响。重要的进步包括:(a) 在每周时间尺度上以亚米分辨率解决湖泊的能力;(b) 在季节性时间尺度上测量湖泊深度和体积变化,包括对湖泊排水事件的零星观测和 (c) 整合多个光学卫星数据集以获得整个大陆的湖泊分布观测。然而,尽管最近取得了进展,但我们的理解仍然存在重大差距,最明显的是:(a) SGL 开发的季节性变化与近地表气候之间的关系;(b) SGL 排水事件对接地冰和浮冰的普遍性和影响,以及 (c) 单个冰架对湖泊引起的水力压裂的敏感性。鉴于地表融化和 SGL 的发展预计将在南极洲的地表物质平衡中发挥越来越重要的作用,弥合这些差距将有助于限制对未来南极洲冰快速流失的预测。
更新日期:2020-05-19
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