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基于镭同位素示踪的嵊泗高场湾海底地下水排放

邢万里 陈小刚 杜金洲

引用本文:
Citation:

基于镭同位素示踪的嵊泗高场湾海底地下水排放

    作者简介: 邢万里(1991-),男,山东德州人,硕士,主要研究方向为同位素海洋学,E-mail:xingwanli0@163.com;
  • 中图分类号: P736.44;X143

Using radium isotopes to estimate SGD flux in Gaochang bay,Shengsi

  • 摘要: 作为全球水循环的重要组成部分,海底地下水排放(SGD)是营养盐等陆源物质进入海洋的重要途径之一。本文利用天然放射性同位素223Ra、224Ra和228Ra对嵊泗岛高场湾SGD通量及及其所携带的营养盐通量进行了估算。研究表明,地下水中223Ra(16.7 ±2.9 dpm/100 L)、224Ra(479 ±18 dpm/100 L)、228Ra(97±4 dpm/100 L)的活度远高于近岸水体中223Ra(3.5 ±0.7 dpm/100 L)、224Ra(80 ±4 dpm/100 L)、228Ra(31±2 dpm/100 L)的活度。运用潮动力模型,基于223Ra和224Ra得到的SGD速率分别为7.6 cm/d和4.1 cm/d,而根据223Ra的离岸输送估算出SGD速率为22 cm/d。结合地下水端元营养盐的浓度计算得SGD携带的溶解无机氮(DIN)、溶解无机磷(DIP)、溶解硅(DSi)的排泄通量分别为593,4.16和241 μmol/(m2·s)。
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出版历程
  • 收稿日期:  2018-03-15
  • 录用日期:  2018-06-21

基于镭同位素示踪的嵊泗高场湾海底地下水排放

    作者简介:邢万里(1991-),男,山东德州人,硕士,主要研究方向为同位素海洋学,E-mail:xingwanli0@163.com
  • 华东师范大学 河口海岸学国家重点实验室, 上海 200062

摘要: 作为全球水循环的重要组成部分,海底地下水排放(SGD)是营养盐等陆源物质进入海洋的重要途径之一。本文利用天然放射性同位素223Ra、224Ra和228Ra对嵊泗岛高场湾SGD通量及及其所携带的营养盐通量进行了估算。研究表明,地下水中223Ra(16.7 ±2.9 dpm/100 L)、224Ra(479 ±18 dpm/100 L)、228Ra(97±4 dpm/100 L)的活度远高于近岸水体中223Ra(3.5 ±0.7 dpm/100 L)、224Ra(80 ±4 dpm/100 L)、228Ra(31±2 dpm/100 L)的活度。运用潮动力模型,基于223Ra和224Ra得到的SGD速率分别为7.6 cm/d和4.1 cm/d,而根据223Ra的离岸输送估算出SGD速率为22 cm/d。结合地下水端元营养盐的浓度计算得SGD携带的溶解无机氮(DIN)、溶解无机磷(DIP)、溶解硅(DSi)的排泄通量分别为593,4.16和241 μmol/(m2·s)。

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