Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6358408 | Marine Pollution Bulletin | 2014 | 11 Pages |
Abstract
224Ra and 223Ra 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 dâ1, including lateral SGD of 5.7-7.9 cm dâ1 and bottom SGD of 0.3-2.0 cm dâ1. Fresh SGD is estimated to be (2.1-5.5) Ã 105 m3 dâ1. Nutrient fluxes (mol dâ1) from SGD are estimated to be (3-7.4) Ã 104 (dissolved inorganic nitrogen), (2.4-6.2) Ã 102 (dissolved inorganic phosphate) and (6.5-16) Ã 104 (dissolved silicate). Primary productivity is estimated to be (1.5-15) Ã 106 gC dâ1, 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.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Oceanography
Authors
Xin Luo, Jiu Jimmy Jiao, W.S. Moore, Chun Ming Lee,