Upper Ocean Distribution of Glacial Meltwater in the Amundsen Sea, Antarctica
Upper Ocean Distribution of Glacial Meltwater in the Amundsen Sea, Antarctica
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DOI：
10.1029/2019jc015133
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发表时间：
2019-10-14
影响因子：
3.6
通讯作者：
Heywood, Karen J.
中科院分区：
文献类型：
--
作者：
Biddle, Louise C.;Loose, Brice;Heywood, Karen J.
阿蒙森海的松岛冰架，由于温暖的海水渗透到冰架下面，导致基底融化，热量输送增加，质量正在减少。追踪这种温暖的深水和由此产生的冰川融水可以确定融化速度的变化和受这种淡水输入增加影响最大的地区。在这里，最佳的多参数分析是用来推断冰川融水分数从独立的水团特征（标准水文观测，（NG），和氧同位素），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。(NG)（氖，氩，氪，氙）和氧同位素被用来跟踪冰川融水和在海水中发现的大气降水，我们演示了他们的签名如何可以用来纠正冰川融水的水文痕迹，这提供了一个更高的分辨率图片。冰川融水的存在被证明掩盖冬季水的属性，导致高达4克/千克冰川融水含量的水质量分析之间的差异。这种差异可以通过重新定义水文冰川融水计算中的“纯”冬季水端点来解释。校正后的冰川融水含量值显示，在150和400米之间的水柱在所有的样本位置（高达535公里，从松岛冰架）的持久签名，增加浓度向西沿着海岸线。它还首次显示了冰川融水在东部海峡流出大陆架的特征。
Pine Island Ice Shelf, in the Amundsen Sea, is losing mass due to increased heat transport by warm ocean water penetrating beneath the ice shelf and causing basal melt. Tracing this warm deep water and the resulting glacial meltwater can identify changes in melt rate and the regions most affected by the increased input of this freshwater. Here, optimum multiparameter analysis is used to deduce glacial meltwater fractions from independent water mass characteristics (standard hydrographic observations, (NG), and oxygen isotopes), collected during a ship-based campaign in the eastern Amundsen Sea in February-March 2014. (NG) (neon, argon, krypton, and xenon) and oxygen isotopes are used to trace the glacial melt and meteoric water found in seawater, and we demonstrate how their signatures can be used to rectify the hydrographic trace of glacial meltwater, which provides a much higher-resolution picture. The presence of glacial meltwater is shown to mask the Winter Water properties, resulting in differences between the water mass analyses of up to 4-g/kg glacial meltwater content. This discrepancy can be accounted for by redefining the "pure" Winter Water endpoint in the hydrographic glacial meltwater calculation. The corrected glacial meltwater content values show a persistent signature between 150 and 400 m of the water column across all of the sample locations (up to 535 km from Pine Island Ice Shelf), with increased concentration toward the west along the coastline. It also shows, for the first time, the signature of glacial meltwater flowing off-shelf in the eastern channel.