MOE Key Laboratory of Groundwater Circulation and Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing, 100083, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing, 100083, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing, 100083, China; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control and School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
J Environ Radioact. 2020 Feb;212:106132. doi: 10.1016/j.jenvrad.2019.106132. Epub 2019 Dec 11.
Submarine groundwater discharge (SGD) supplies substantial quantities of nutrients from land to oceans. However, SGD and associated nutrient fluxes have long been ignored in Bohai Bay, which is subjected to the serious environmental problem. Here, we investigated the concentrations of radon (Rn) and nutrients in groundwater and surface water in the western Bohai Bay during May 2017. The flushing time in the bay was estimated to be 38.8-58.3 days based on tidal prism model. The SGD flux was estimated to be 7.3 ± 4.8 cm d based on Rn mass balance model. The SGD associated nutrient fluxes were estimated to be (6.3 ± 4.1) × 10 mol d for dissolved inorganic nitrogen (DIN), (1.2 ± 0.8) × 10 mol d for dissolved inorganic phosphorus (DIP) and (7.5 ± 4.9) × 10 mol d for dissolved inorganic silicon (DSi). By establishing nutrient budgets, we found that SGD was a major source, contributing 80.8% of all source for DIN, 90.7% of all source for DIP and 78.4% of all source for DSi into the western Bohai Bay. This study shows that SGD associated nutrient fluxes may have significant impact on nutrient budgets in the western Bohai Bay.
海底地下水排泄（SGD）将大量营养物质从陆地输送到海洋。然而，长期以来，渤海湾一直忽视了 SGD 和相关的营养物质通量，而该地区面临着严重的环境问题。在这里，我们在 2017 年 5 月调查了渤海湾西部地下水和地表水的氡（Rn）和营养物浓度。根据潮汐棱柱模型，海湾的冲洗时间估计为 38.8-58.3 天。根据 Rn 质量平衡模型，估算的 SGD 通量为 7.3±4.8cm d。估算的 SGD 相关营养物质通量分别为溶解无机氮（DIN）（6.3±4.1）×10 mol d、溶解无机磷（DIP）（1.2±0.8）×10 mol d 和溶解无机硅（DSi）（7.5±4.9）×10 mol d。通过建立营养物预算，我们发现 SGD 是一个主要的来源，对 DIN 的所有来源的贡献为 80.8%，对 DIP 的所有来源的贡献为 90.7%，对 DSi 的所有来源的贡献为 78.4%。本研究表明，SGD 相关的营养物质通量可能对渤海湾西部的营养物质预算产生重大影响。
