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Biogeochemical processes in land-ocean interfaces, surface estuaries, subterranean estuaries and sediment-water interface
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Estimation of submarine groundwater discharge and associated heavy metal and nutrient fluxes into Bohai bay, China
P-C2-09-S
Qianqian Wang* , 1MOE key Laboratory of Groundwater Circulation and Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing, China
2State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing, China
3School of Environmental Science and Engineering and Shenzhen Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen, China
Hailong Li, 2State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing, China
3School of Environmental Science and Engineering and Shenzhen Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen, China
Yan Zhang, 1MOE key Laboratory of Groundwater Circulation and Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing, China
2State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing, China
Xuejing Wang, 3School of Environmental Science and Engineering and Shenzhen Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen, China
Kai Xiao, 3School of Environmental Science and Engineering and Shenzhen Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen, China
Wenjing Qu, 4Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Xiaolang Zhang, 4Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
5School of Water Resources and Environment, Hebei GEO University, Shijiazhuang, China
Presenter Email: qqwang@cugb.edu.cn |
Bohai Bay, one of the three major bays of the Bohai Sea, is subjected to serious environmental problems. However, submarine groundwater discharge (SGD) and associated nutrient and metal fluxes of the bay are seldom reported. In this study, we presented a mass balance models of the radium isotopes 223Ra and 228Ra considering the radium losses caused by recirculated seawater to estimate the flushing time and SGD in Bohai Bay, in May 2017. Submarine fresh groundwater discharge (SFGD) was estimated based on water and salt mass balance models. The estimated fluxes of nutrients (DIN, DIP and DSi) and heavy metals (Fe, Mn, Zn, Pb, Li, Cr and Cd) from SGD were comparable to or even more than those supplied by the local riverine sources. This results indicate that SGD can act as a significant source of nutrients and metals, and may pose great impacts on marine biogeochemical cycles in Bohai Bay.
Keywords: Submarine groundwater discharge; 223Ra; 228Ra; Nutrient loadings; Metal loadings; Bohai Bay
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