Boron in seawater, ice and brine in the Bering and Chukchi Seas May-June 2021

This is the raw data collected in the Bering and Chukchi Seas that support our publication in Nature Communications - Earth and Environment 2022. 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 CO2 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 provide this ratio in the marginal ice zone of the Bering and Chukchi seas during late spring of 2021. We found 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.本数据集为支撑我们发表于《Nature Communications - Earth and Environment》2022年刊的研究成果所采集的白令海与楚科奇海原始实测数据。北冰洋正经历海冰净消退过程，随着季节性海冰消融加剧与水体盐度淡化，预计到2050年9月将出现无冰海域。精准估算海洋二氧化碳吸收量，有赖于对碳酸盐体系参数（包括总碱度）的精细化评估。海洋碱度的第三大贡献来源为硼（boron），其以硼酸根离子形式存在。研究表明，硼在开阔大洋体系中属于保守性物质，因此可通过硼盐度比（boron/salinity）计算硼所贡献的碱度，以此替代原位硼含量实测。本数据集提供了2021年晚春时节白令海与楚科奇海边缘冰区的硼盐度比数据。研究发现，冰芯与卤水中的硼盐度比存在显著波动，其相对盐度的硼含量表现为富集或亏损状态。在低盐度融水区计算硼酸根对总碱度的贡献值（最高可达10 µmol kg⁻¹）时，需考虑上述波动带来的影响。