Large submarine groundwater discharge and benthic eutrophication in Bangdu Bay on volcanic Jeju Island, Korea
Large submarine groundwater discharge and benthic eutrophication in Bangdu Bay on volcanic Jeju Island, Korea
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DOI：
10.4319/lo.2005.50.5.1393
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发表时间：
2005-09-01
影响因子：
4.5
通讯作者：
Kim, G
中科院分区：
文献类型：
--
作者：
Hwang, DW;Lee, YW;Kim, G
通过分析Rn-222、Ra同位素（Ra-224和Ra-226）和海水、孔隙水和沿海地下水中的营养物质，我们估计了地下水（SGD）和相关营养物质向韩国济州岛半封闭的邦都湾的海底排放。根据Rn-222、Ra-224、Ra-226和Si的质量平衡，地下水向邦都湾的输入量为120-180 m（3）m（-2）yr（-1），远高于典型大陆边缘的地下水输入量。对于溶解无机氮（DIN）、溶解无机磷（DIP）和溶解无机硅酸盐（DSi），SGD的营养盐通量分别约占总输入量的90%、20%和80%（公海沃茨除外）。这些来自SGD的过量营养盐输入是该湾“新营养盐”的主要来源。光合色素和底栖藻类分布的基础上，我们认为，大通量的过量营养盐从SGD可能会导致底栖富营养化在半封闭海湾这个高渗透性的火山岛。
We estimated the submarine discharge of groundwater (SGD) and associated nutrients into the semienclosed Bangdu Bay on a volcanic island, Jeju, Korea, by analyzing Rn-222, Ra isotopes (Ra-224 and Ra-226), and nutrients in seawater, pore water, and coastal groundwater. The submarine inputs of groundwater into Bangdu Bay of 120-180 m(3) m(-2) yr(-1) (on the basis of Rn-222, Ra-224, Ra-226, and Si mass balances) were much higher than those reported from typical continental margins. The nutrient fluxes from SGD were about 90%, 20%, and 80% of the total input (except from open ocean waters) for dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and dissolved inorganic silicate (DSi), respectively. These excess nutrient inputs from SGD are the major sources of "new nutrients" in this bay. On the basis of photosynthetic pigments and benthic algal distributions, we suggest that the large fluxes of excess nutrients from SGD can cause benthic eutrophication in a semienclosed bay on this highly permeable volcanic island.