Submarine groundwater discharge estimation in an urbanized embayment in Hong Kong via short-lived radium isotopes and its implication of nutrient loadings and primary production
Submarine groundwater discharge estimation in an urbanized embayment in Hong Kong via short-lived radium isotopes and its implication of nutrient loadings and primary production
复制标题
通过短寿命镭同位素估算香港城市化海湾的海底地下水排放及其对养分负荷和初级生产的影响
DOI：
10.1016/j.marpolbul.2014.03.005
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发表时间：
2014-05-15
影响因子：
5.8
通讯作者：
Lee, Chun Ming
中科院分区：
文献类型：
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作者：
Luo, Xin;Jiao, Jiu Jimmy;Lee, Chun Ming
采用Ra-224和Ra-223作为示踪剂，对香港高度都市化的吐露港海底地下水排放(SGD)进行了定标。在采样数据的基础上，采用两层镭质量平衡模型估算了横向SGD和底部SGD。总SGD为1.2~3.0 cm d(-1)，其中外侧SGD为5.7~7.9 cm，底部SGD为0.3~2.0 cm d(-1)。新鲜的5Gd为(2.1-5.5)×10(5)m(3)d(-1)。SGD的营养通量(摩尔d(-1))估计为(3-7.4)×10(4)(溶解无机氮)、(2.4-6.2)×10(2)(溶解无机磷)和(6.5-16)×10(4)(溶解硅酸盐)。初级生产力估计为(1.5-15)×10(6)Gcd(-1)，其中2-53%由SGD诱导的磷酸盐通量支持。研究表明，SGD是近岸水域营养物质的重要来源，可能会导致初级生产力的明显增加。这些发现必须在未来的海岸生态管理中得到考虑。(C)2014爱思唯尔有限公司。保留所有权利。
Ra-224 and Ra-223 are adopted as tracers to qualify submarine groundwater discharge (SGD) in Tolo Harbor, a highly urbanized embayment in Hong Kong. Based on the sampling data, a two-layered radium mass balance model is used to estimate lateral SGD and bottom SGD. Total SGD is estimated to be 1.2-3.0 cm d(-1), including lateral SGD of 5.7-7.9 cm el and bottom SGD of 0.3-2.0 cm d(-1). Fresh 5GD is estimated to be (2.1-5.5) x 10(5) m(3) d(-1). Nutrient fluxes (mol d(-1)) from SGD are estimated to be (3-7.4) x 10(4) (dissolved inorganic nitrogen), (2.4-6.2) x 10(2) (dissolved inorganic phosphate) and (6.5-16) x 10(4) (dissolved silicate). Primary productivity is estimated to be (1.5-15) x 10(6) gC d(-1), 2-53% of which is supported by SGD-induced phosphate fluxes. The study indicates that SGD is a significant source of nutrients to coastal waters and may cause an obvious increase of primary production. These findings must be considered in future coastal ecological management. (C) 2014 Elsevier Ltd. All rights reserved.