Non-conservative nature of boron in Arctic marginal ice zones
Non-conservative nature of boron in Arctic marginal ice zones
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DOI：
10.1038/s43247-022-00552-0
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发表时间：
2022-09
影响因子：
7.9
通讯作者：
P. Vlahos;Kitack Lee;Chang‐Ho Lee;L. Barrett;L. Juranek
中科院分区：
文献类型：
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作者：
P. Vlahos;Kitack Lee;Chang‐Ho Lee;L. Barrett;L. Juranek
北冰洋正在经历海冰的净损失。预计到2050年，无冰的九月将随着季节性融化和清新而加剧。准确的二氧化碳吸收估计依赖于对碳酸盐参数（包括总碱度）的细致评估。第三大贡献者海洋碱度是硼（硼酸根离子）。硼已被证明是保守的，在开放的海洋系统中，和硼盐度比（硼/盐度），因此被用来解释硼碱度代替原位硼测量。在这里，我们报告了2021年春末白令海和楚科奇海边缘冰区的这一比例。我们发现相当大的变化，出生/盐度值在冰芯和盐水，代表过剩或赤字的硼相对于盐度。在解释低盐度熔体区域硼酸盐对总碱度（高达10 µmol kg−1）的贡献时，应考虑这种可变性。
The Arctic Ocean is experiencing a net loss of sea ice. Ice-free Septembers are predicted by 2050 with intensified seasonal melt and freshening. Accurate carbon dioxide uptake estimates rely on meticulous assessments of carbonate parameters including total alkalinity. The third largest contributor to oceanic alkalinity is boron (as borate ions). Boron has been shown to be conservative in open ocean systems, and the boron to salinity ratio (boron/salinity) is therefore used to account for boron alkalinity in lieu of in situ boron measurements. Here we report this ratio in the marginal ice zone of the Bering and Chukchi seas during late spring of 2021. We find considerable variation in born/salinity values in ice cores and brine, representing either excesses or deficits of boron relative to salinity. This variability should be considered when accounting for borate contributions to total alkalinity (up to 10 µmol kg−1) in low salinity melt regions.