期刊
MARINE POLLUTION BULLETIN
卷 82, 期 1-2, 页码 144-154出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2014.03.005
关键词
Short-lived radium isotopes; Mass balance model; Submarine groundwater discharge; Nutrient loadings; Primary production
资金
- Research Grants Council of Hong Kong [HKU 7028/06P]
- National Natural Science Fundation of China [41372261]
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.
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