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首页> 外文期刊>Marine Chemistry >Groundwater and surface water quality in a coastal bay with negligible fresh ground water discharge: Arraial do Cabo, Brazil
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Groundwater and surface water quality in a coastal bay with negligible fresh ground water discharge: Arraial do Cabo, Brazil

机译：淡水排放量可忽略的沿海海湾的地下水和地表水质量：巴西Arraial do Cabo

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摘要

Submarine groundwater discharge (SGD) is an important mechanism governing the flux of materials to the coastal region. The loading of nutrients to coastal regions occurs through terrestrial outflow, atmospheric deposition and exchanges with the ocean. In this study, multiple tracers of groundwater input (~(223)Ra, ~(224)Ra, ~(225)Ra, ~(228)Ra, salinity, Ba, Si, U, δ(~(18)O) and 6(~2H)) were used to determine the amount of nutrients contributing to the submarine groundwater discharge in the Arraial do Cabo region, which is located on Brazil's southeastern coast. This region is a summer resort, and its population increases by a factor of ten during vacation periods. The nutrient concentrations peaked at 1700 umol L~(-1) for NO_3~- and 900 μmol L~(-1) for NH_4~+ in groundwater wells close to the beachfront; however, no elevated nutrient concentrations were observed in the coastal seawa-ter.This finding was credited to the existence of a physical barrier which hinders the existence of freshwater SCD and also due to the groundwater pumping existent on almost all buildings close to the shoreline. Seepage experiments demonstrated the presence of SGD, which represents recirculated seawater, based on the 8(~(18)0) and 6(~2H) levels and is about 0.06 m~3m~(-2) day~(-1). Ra was enriched in groundwater samples (1.2 ± 1.0 Bq m~(-3) for ~(223)Ra and 12.2 ± 92 Bq m~(-3) for ~(224)Ra, 95% confidence interval) compared to seawater samples (0.077 ± 0.013 Bq m~(-3) for ~(223)Ra and 0.66 ± 0.17 Bq m~(-3) for ~(224)Ra, 95% confidence interval).
机译：海底地下水排放（SGD）是控制物质流向沿海地区的重要机制。营养物质向沿海地区的装载是通过陆地外流，大气沉积和与海洋的交换而发生的。在这项研究中，地下水输入的多个示踪物（〜（223）Ra，〜（224）Ra，〜（225）Ra，〜（228）Ra，盐度，Ba，Si，U，δ（〜（18）O）和6（〜2H））来确定有助于巴西东南沿海Arraial do Cabo地区海底地下水排放的养分含量。该地区是避暑胜地，度假期间人口增长了十倍。在靠近海滩的地下水井中，NO_3〜-的养分浓度最高为1700 umol L〜（-1），NH_4〜+的营养盐浓度最高为900μmolL〜（-1）。然而，在沿海海域未观察到养分浓度升高。这一发现归因于存在物理障碍，阻碍了淡水SCD的存在，也归因于几乎所有靠近海岸线的建筑物都存在着地下水抽水。渗流实验表明，基于8（〜（18）0）和6（〜2H）水平，代表再循环海水的SGD的存在，约为0.06 m〜3m〜（-2）天〜（-1）。与海水样品相比，Ra在地下水样品中富集（〜（223）Ra为1.2±1.0 Bq m〜（-3），〜（224）Ra为12.2±92 Bq m〜（-3），置信区间为95％） （〜（223）Ra为0.077±0.013 Bq m〜（-3），〜（224）Ra为0.66±0.17 Bq m〜（-3），置信区间为95％）。

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  • 来源
    《Marine Chemistry》 |2013年第20期|85-97|共13页
  • 作者

    Jose Marcus Godoy; Thaisa Abreu Souza; Maria Luiza D.P. Godoy; Isabel Moreira; Zenildo L. Carvalho; Luiz D. Lacerda; Flavio C. Fernandes;

  • 作者单位

    Departamento de Quimica, Pontiflda Universidade Catolica do Rio de Janeiro, PUC-Rio, Rio de Janeiro, RJ, Brazil,Institute de RadioprotefSo e Dosimetria, IRD/CNEN, Rio de Janeiro, RJ, Brazil;

    Departamento de Quimica, Pontiflda Universidade Catolica do Rio de Janeiro, PUC-Rio, Rio de Janeiro, RJ, Brazil;

    Institute de RadioprotefSo e Dosimetria, IRD/CNEN, Rio de Janeiro, RJ, Brazil;

    Departamento de Quimica, Pontiflda Universidade Catolica do Rio de Janeiro, PUC-Rio, Rio de Janeiro, RJ, Brazil;

    Institute de RadioprotefSo e Dosimetria, IRD/CNEN, Rio de Janeiro, RJ, Brazil;

    Institute de Ciencias do Mar, Universidade Federal do Ceari. UFC, Fonaleza, CE, Brazil;

    Institute de Estudos do Mar Almirante Bau/o Moreira, IEAPM, Arraial do Cabo, RJ, Brazil;

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  • 正文语种 eng
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  • 关键词

    Radium isotopes; Silicon; Barium; Uranium; Salinity; Nutrients; SGD; Light isotopes;

    机译：镭同位素;硅;钡;铀;盐度;营养素;新币;轻同位素;

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