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224Ra对春季青岛近海水体混合及营养盐来源的示踪研究
董文华, 江雪艳, 于志刚, 姚庆祯, 许博超
中国海洋大学海洋化学理论与工程技术教育部重点实验室, 化学化工学院, 山东青岛 266100
Using 224Ra to track coastal water mixing process and nutrients source in Qingdao Coast
DONG Wen-hua, JIANG Xue-yan, YU Zhi-gang, YAO Qing-zhen, XU Bo-chao
Ocean University of ChinaKey Laboratory of Marine Chemistry Theory and Technology, College of Chemistry and Chemical Engineering, Qingdao 266100, China
Abstract：In this study,we investigated the spatio-temporal distribution of excess 224Ra (224Raex) and its influence factors in the Qingdao coast,and further used it as tracer to evaluate the water mixing process and nutrients source.The following informations were obtained:the activity of 224Raex range from 1.3±0.2 dpm/100 L to 10.2±1.3 dpm/100 L.High radium concentrations were found in nearshore and ebb tide,and low values were in offshore and high tide.We found that 224Ra-salinity was a better choice to track the water mixing process in the study area than salinity-temperature pair.The correlation of 224Raex and salinity with nutrients were used to discuss the nutrients souces.In March 2013,DIP and DSi concentrations were mainly controlled by tidal mixing in the Qingdao coast,but DIN might have multi-sources,such as riverine input,industrual and domestic wastewater,tidal mixing and submarine groundwater discharge.
DONG Wen-hua,JIANG Xue-yan,YU Zhi-gang et al. Using 224Ra to track coastal water mixing process and nutrients source in Qingdao Coast[J]. Marine Environmental Science, 2016, 35(1): 117-122.
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