Summertime linkage between Antarctic sea-ice extent and ice-shelf basal melting through Antarctic coastal water masses’ variability: a circumpolar Southern Ocean model study
Summertime linkage between Antarctic sea-ice extent and ice-shelf basal melting through Antarctic coastal water masses’ variability: a circumpolar Southern Ocean model study
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夏季南极海冰范围与南极沿海水团变化引起的冰架基底融化之间的联系：环极地南大洋模型研究
DOI：
10.1088/1748-9326/ac0de0
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发表时间：
2021
影响因子：
6.7
通讯作者：
Kusahara Kazuya
中科院分区：
文献类型：
--
作者：
Suzuki Tatsuo;Komuro Yoshiki;Kusahara Kazuya;Tatebe Hiroaki;Kusahara Kazuya
最近的观测表明，冰冻圈的两个组成部分，即南极海冰和南大洋冰架，几十年来一直在变化。在这里，我们分析的结果，从海洋海冰冰架模型研究南极海冰范围和冰架基底融化的变化。该模型再现了南极海冰范围的季节性和年际变化，并表明夏季冰架基底融化与海冰范围异常密切相关。例如，2016年春季南极海冰范围前所未有的最小值伴随着模型中南极冰架融化的大幅增加。对南极沿岸水团流入冰架空洞的详细分析说明了强反相关中的物理联系。这项研究表明，南极夏季海冰范围的海冰边缘接近南极海岸线的地区可以是南极沿海水团和随后的冰架基底融化的代理。
Recent observations indicate that two cryospheric components, namely the Antarctic sea ice and ice shelf over the Southern Ocean, have been changing over the decades. Here we analyze results from an ocean–sea ice–ice shelf model to examine variability in the Antarctic sea-ice extent and ice-shelf basal melting. The model reproduces seasonal and interannual variability in the Antarctic sea-ice extent and demonstrates that summertime ice-shelf basal melting is closely anti-correlated with the sea-ice extent anomaly. For example, the unprecedented minimum of the Antarctic sea-ice extent in the 2016 spring was accompanied by a substantial increase in the Antarctic ice-shelf melting in the model. Detailed analysis of Antarctic coastal water masses flowing into the ice-shelf cavities illustrates the physical linkage in the strong anti-correlation. This study suggests that the Antarctic summer sea-ice extent in the regions where the sea-ice edge approaches the Antarctic coastline can be a proxy for Antarctic coastal water masses and subsequent ice-shelf basal melting.