Bathymetry data and water column profiles in the shallow waters of Langhovde in L?tzow-Holm Bay, East Antarctica
Bathymetry data and water column profiles in the shallow waters of Langhovde in L?tzow-Holm Bay, East Antarctica
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南极洲东部利措-霍尔姆湾 Langhovde 浅水区测深数据和水柱剖面
DOI：
10.1016/j.polar.2021.100650
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发表时间：
2021
期刊：
影响因子：
1.8
通讯作者：
Yamasaki Shintaro
中科院分区：
文献类型：
--
作者：
Ishiwa Takeshige;Tokuda Yuki;Itaki Takuya;Sasaki Satoshi;Suganuma Yusuke;Yamasaki Shintaro
南极洲周围浅海沃茨和湖泊的沉积物提供了海平面变化的宝贵记录。了解末次冰消期南极冰盖变化的时间和幅度，对于评估冰川均衡调整对目前冰盖质量平衡的影响至关重要。然而，由于很难进入南极洲，因此很难获得最后一次冰消期间冰盖和海平面变化的实地证据。我们使用便携式声纳系统测量水深和水柱剖面（海水温度，盐度，溶解氧，浊度）在湖Nurtured和Langhovde，南极洲东部的浅海沃茨，收集基线数据的海平面重建从末次冰期最大（~20 ka）。测深数据显示，Langhovde调查的浅海沃茨有水深100米的盆地，约有−67和−92米的底床，其中沉积物为最后一次冰消提供了潜在有用的海平面档案。努尔特鲁姆湖的水柱剖面显示，在水深约11米处有一个化学跃层，而在该深度以下则处于缺氧状态。这些基线数据将有助于重建东南极洲的海平面和冰盖变化。
The sediments of shallow marine waters and lakes around Antarctica provide valuable records of sea-level changes. Understanding the timing and amplitude of Antarctic Ice Sheet changes during the last deglaciation is essential to assess the effect of glacial isostatic adjustments on the present ice-sheet mass balance. However, the difficulty in accessing Antarctica makes it challenging to obtain field-based evidence of ice-sheet and sea-level change during the last deglaciation. We used a portable sonar system to measure bathymetry and water column profiles (sea temperature, salinity, dissolved oxygen, and turbidity) in Lake Nurume and shallow marine waters of Langhovde, East Antarctica, to collect baseline data for sea-level reconstruction from the Last Glacial Maximum (~20 ka). The bathymetry data reveals the surveyed shallow marine waters of Langhovde have basins of 100 m water depth with approximately −67 and −92 m sills, in which sediments provide a potentially useful sea-level archive for the last deglaciation. The water column profile in Lake Nurume reveals a chemocline at ~11 m water depth and anoxic condition below that depth. These baseline data will be useful to reconstruct sea-level and ice-sheet changes in East Antarctica.