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Determining groundwater Ra end-member values for the estimation of the magnitude of submarine groundwater discharge using Ra isotope tracers

机译:使用Ra同位素示踪剂确定地下水Ra末端值以估算海底地下水排放量

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摘要

Radium isotopes (Ra-228 and Ra-226) are excellent tracers of submarine groundwater discharge (SGD). To estimate SGD magnitudes, information on the end-member values of Ra concentrations in groundwater is critical; however, the distribution characteristics of Ra in coastal aquifers are poorly understood. In this study, we show that Ra concentrations in coastal groundwater are primarily dependent on salinity based on the data (n > 500) obtained from global coastal aquifers, although previous end-member calculations averaged all Ra concentrations without considering salinity. If we assume that SGD is composed mainly of seawater infiltrating the aquifer, previous estimates of SGD for the Atlantic Ocean and the global ocean were overestimated twofold to threefold. This may be similar for other applications using different Ra isotopes. Our study highlights that the end-members of Ra isotopes in groundwater should be carefully considered when estimating SGD using Ra isotope mass balances in the ocean.
机译:镭同位素(Ra-228和Ra-226)是海底地下水排放(SGD)的优秀示踪剂。为了估算SGD的幅度,有关地下水中Ra浓度的最终值的信息至关重要。但是,人们对沿海含水层中Ra的分布特征了解甚少。在这项研究中,我们根据全球沿海含水层获得的数据(n> 500)显示,沿海地下水中的Ra浓度主要取决于盐度,尽管先前的最终成员计算均将所有Ra浓度取平均值而不考虑盐度。如果我们假设SGD主要由渗透到含水层中的海水组成,那么以前对大西洋和全球海洋的SGD估算就被高估了两倍至三倍。对于使用不同Ra同位素的其他应用来说,这可能是相似的。我们的研究强调,在使用海洋中的Ra同位素质量平衡估算SGD时,应仔细考虑地下水中Ra同位素的末端成员。

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