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《Geochimica》 2012-01
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Temporal and spatial variations of ~(226)Ra in coastal sea and the estimation of submarine groundwater discharge (SGD)

JI Zhong-qiang1,2,HU Dan3,WENG Huan-xin1,ZHANG Feng1 and HAN Zheng-dong3 1.Institute of Environment and Biogeochemistry,Zhejiang University,Hangzhou 310027,China;2.Laboratory of Marine Ecosystem and Biogeochemistry,The Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;3.Radiation Monitoring Technical Center,State Environmental Protection Administration,Hangzhou 310012,China  
Submarine groundwater discharge(SGD) is an important pathway for terrestrial material transferring to coastal sea.The shoreline is very long in China.Thus,there are important theoretic and practical meanings to accurately evaluate SGD and their potential effects to the ecological environment in coasts of China.The study area was in a gulf in Zhujiajian,Zhoushan,Zhejiang Province.Groundwater and sea water were sampled and analyzed during winter and summer,the dry and rainy season.Based on the temporal and spatial variations of 226Ra in groundwater and sea water,the SGD flux in the study area is estimated to be 2.40×105 ~2.30×106 m3/d,using the mass balance of 226Ra.and a conservative year average is 8.64×107 ~8.28×108 m3/a,based on the dry period data.Besides,the annual input flux of the nutrients,nitrogen,phosphorus and silicon,3.256 t/a,0.029 t/a and 52.775 t/a,separately,were estimated by hydrologic method using annual parameters,like precipitation et al.
【Fund】: 国家自然科学基金(40572175)
【CateGory Index】: P641
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