Glacial Meltwater Identification in the Amundsen Sea
Glacial Meltwater Identification in the Amundsen Sea
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DOI：
10.1175/jpo-d-16-0221.1
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发表时间：
2017-04-01
影响因子：
3.5
通讯作者：
Jenkins, Adrian
中科院分区：
文献类型：
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作者：
Biddle, Louise C.;Heywood, Karen J.;Jenkins, Adrian
阿蒙森海的松岛冰架由于温暖的海洋沃茨从下面融化了冰，正在失去质量。追踪冰架的融水路径对于确定受这种水输入增加影响最严重的地区非常重要。在这里，最佳的多参数分析是用来推断冰川融水分数从水的质量特性（温度，盐度和溶解氧浓度），收集在阿蒙森海东部在2014年2月至3月的船为基础的运动。使用一个一维的海洋模型，过程，如在大陆架上的源水质量和生物生产力/呼吸特性的变化，影响计算的表观融水分数。这些过程可能导致错误的融水特征，产生误导性的明显冰川融水路径。另一种冰川融水的计算建议，使用伪环极深水端点和使用人工增加溶解氧测量的不确定性。伪环极深水特征受冰架下水深的影响。冰川融水部分揭示了2014年融水通往松岛冰架西部的路径，沿着海岸线。
Pine Island Ice Shelf, in the Amundsen Sea, is losing mass because of warm ocean waters melting the ice from below. Tracing meltwater pathways from ice shelves is important for identifying the regions most affected by the increased input of this water type. Here, optimum multiparameter analysis is used to deduce glacial meltwater fractions from water mass characteristics (temperature, salinity, and dissolved oxygen concentrations), collected during a ship-based campaign in the eastern Amundsen Sea in February-March 2014. Using a one-dimensional ocean model, processes such as variability in the characteristics of the source water masses on shelf and biological productivity/respiration are shown to affect the calculated apparent meltwater fractions. These processes can result in a false meltwater signature, creating misleading apparent glacial meltwater pathways. An alternative glacial meltwater calculation is suggested, using a pseudo-Circumpolar Deep Water endpoint and using an artificial increase in uncertainty of the dissolved oxygen measurements. The pseudo-Circumpolar Deep Water characteristics are affected by the under ice shelf bathymetry. The glacial meltwater fractions reveal a pathway for 2014 meltwater leading to the west of Pine Island Ice Shelf, along the coastline.