Formation of dense shelf water associated with sea ice freezing in the Gulf of Anadyr estimated with oxygen isotopic ratios
Formation of dense shelf water associated with sea ice freezing in the Gulf of Anadyr estimated with oxygen isotopic ratios
复制标题
用氧同位素比估计阿纳德尔湾与海冰冻结相关的致密陆架水的形成
DOI：
10.1016/j.pocean.2021.102595
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发表时间：
2021
影响因子：
4.1
通讯作者：
Nishioka Jun
中科院分区：
文献类型：
--
作者：
Nomura Daiki;Abe Hiroto;Hirawake Toru;Ooki Atsushi;Yamashita Youhei;Murayama Aiko;Ono Kazuya;Nishioka Jun
我们分析了2018年夏季的温、盐度数据和氧同位素比值(δ18O)，以量化与白令海西北部阿纳迪尔湾海冰冻结相关的致密陆架水的形成。在阿纳德尔湾上游(西南)的样品中，盐度与δ18O表现出很强的线性关系。然而，在阿纳德尔湾北部的底层水(>；26.5σθ)，那里是冬季高海冰产生的地方，盐度明显高于上游水，而δ18O在相同的范围内。这种偏离与海冰的形成是一致的，这是通过卤水排出和随后的Dsw形成，在不改变δ18O的情况下导致盐度增加。根据这些结果进行的物质平衡计算得出的海冰产量估计相当于0.7微米的厚度，这一结果与基于卫星数据的2018年年度冰产量的独立估计相符。尽管2018年冬季包括阿纳代尔湾在内的白令海出现了历史上最低的海冰范围，但我们的结果表明，阿纳代尔湾仍在继续形成DSW。
We analyzed temperature and salinity data and oxygen isotope ratios (δ18O) in summer 2018 in order to quantify the formation of dense shelf water (DSW) associated with sea ice freezing in the Gulf of Anadyr in the northwestern Bering Sea. Salinity and δ18O displayed a strong linear relationship in samples upstream (southwest) of the Gulf of Anadyr. However, in bottom water (>26.5 σθ) in the northern Gulf of Anadyr, where a large polynya is the site of high sea ice production in winter, salinity was clearly higher than in the upstream water, whereas δ18O was in the same range. This deviation is consistent with the formation of sea ice through brine rejection and subsequent DSW formation, causing an increase of salinity without changing δ18O. A mass balance calculation based on these results yielded an estimated production of sea ice equivalent to a thickness 0.7 m, a result that matched an independent estimate of 2018 annual ice production based on satellite data. Even though the winter of 2018 had a historically low sea ice extent in the Bering Sea, including the Gulf of Anadyr, our results indicate continued DSW formation in the Gulf of Anadyr.