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Yttrium and rare earth element partitioning in seawaters from the Bay of Bengal

机译：孟加拉湾海洋水域中的钇和稀土元素分区

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摘要

The dissolved yttrium (Y) and rare earth element (REE) concentrations of seawater samples collected along a north-south hydrological transect within the Bay of Bengal (BoB) have been analyzed to estimate contributions of the Ganges and Brahmaputra (G-B) river inputs to the dissolved REE distribution of the Northern Indian Ocean. Surface water masses of the BoB are characterized by Y/Ho ratios (84) intermediate between the G-B river suspended sediment (41) and water mass from the South Indian Ocean (93). Covariation of MREE (middle REE, Sm) and LREE (light REE, La) concentrations suggests that the dissolved REEs in surface waters (upper 100 m depth) of the BoB (Sm/La=0.21) appear to derive mainly from the freshwater discharge of the G-B river system. In contrast, values obtained in the intermediate and deep waters (Sm/La=0.14) suggest a mixing of dissolved REEs deriving from the release of G-B river suspended particles (Sm/La=0.16) and the contribution of Antarctic Bottom Water (AABW) (Sm/La=0.12). Consequently, we propose that MREE/MREE* ratios in the BoB waters could be an accurate proxy to trace lithogenic inputs from the G-B river system. The dissolved and particle remineralization Nd fluxes from G-B river system are calculated to constitute about 9% and 4% of the global dissolved river discharge and "boundary inputs" flux. Our estimation indicates that the massive G-B river system inputs could greatly alter the dissolved REEs distribution in the BoB and contribute to the dissolved REEs budget in the ocean.
机译：已经分析了沿着孟加拉湾（BOB）湾南北水文横断进位沿孟加拉（鲍勃）内收集的海水样本的溶解的钇（Y）和稀土元素浓度，以估算恒河和婆罗门（GB）河流投入的贡献北方印度洋的溶解的重新分布。鲍勃的表面水质量以Y / HO比（84）中间为特征在于G-B河悬浮沉积物（41）和来自南印度洋的水质量（93）。 MREE（中间REE，SM）和LREE（LIGHREE，LA）浓度的协变量表明，鲍勃（SM / LA = 0.21）的表面水域（上100米深度）中的溶解REES似乎主要来自淡水放电GB河流系统。相反，在中间水和深水中获得的值（SM / La = 0.14）表明溶解的REES的混合源于GB河悬浮颗粒（SM / LA = 0.16）的释放以及南极底水（AABW）的贡献（SM / LA = 0.12）。因此，我们提出了鲍勃水域中的麦德/麦克士*比率可以是追踪来自G-B河流系统的岩性投入的准确代理。 G-B河流系统的溶解和颗粒再矿化Nd助熔剂计算成占全球溶解河流排放的约9％和4％，“边界输入”通量。我们的估计表明，大规模的G-B河流系统输入可以大大改变鲍勃中的溶解的重新分布，并有助于海洋中的溶解电气预算。

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    Yu Zhaojie; Colin Christophe; Douville Eric; Meynadier Laure; Duchamp-Alphonse Stephanie; Sepulcre Sophie; Wan Shiming; Song Lina; Wu Qiong; Xu Zhaokai; Bassinot Frank;

  • 作者单位

    Univ Paris Saclay Univ Paris Sud CNRS UMR 8148 Lab GEOsci Paris Sud Orsay France;

    Univ Paris Saclay Univ Paris Sud CNRS UMR 8148 Lab GEOsci Paris Sud Orsay France;

    Univ Paris Saclay UVSQ CNRS CEA Lab Sci Climat &

    Environm LSCE IPSL Gif Sur Yvette France;

    Univ Paris Diderot Inst Phys Globe Paris UMR 7154 Equipe Geochim &

    Cosmochim Sorbonne Paris Cite Paris France;

    Univ Paris Saclay Univ Paris Sud CNRS UMR 8148 Lab GEOsci Paris Sud Orsay France;

    Univ Paris Saclay Univ Paris Sud CNRS UMR 8148 Lab GEOsci Paris Sud Orsay France;

    Chinese Acad Sci Inst Oceanol Key Lab Marine Geol &

    Environm Qingdao Peoples R China;

    Chinese Acad Sci Inst Oceanol Key Lab Ocean Circulat &

    Waves Qingdao Peoples R China;

    Tongji Univ State Key Lab Marine Geol Shanghai Peoples R China;

    Chinese Acad Sci Inst Oceanol Key Lab Marine Geol &

    Environm Qingdao Peoples R China;

    Univ Paris Saclay UVSQ CNRS CEA Lab Sci Climat &

    Environm LSCE IPSL Gif Sur Yvette France;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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