| 基于222Rn质量平衡模型的胶州湾海底地下水排泄 |
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| 关键词:submarine groundwater discharge 222Rn mass balance model nutrient Jiaozhou Bay |
| 基金项目:国家自然科学基金项目(编号: 41072174) |
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| The Evaluation of Submarine Groundwater Discharge in Jiaozhou Bay Based on 222Rn Mass Balance |
| Submarine groundwater discharge (SGD), an important part of global water cycle, has recently been a research focus in the field of land-ocean interaction along the coastal zone. Geochemical tracing is a major tool to study submarine groundwater discharge. Taking natural occurring isotope 222Rn as a tracer, the authors built 222Rn mass balance model to estimate groundwater discharge to Jiaozhou Bay, and also evaluated the nutrient fluxes transported via groundwater. River input, dispersion of sediments, and support from parent 226Ra are considered to be the sources of 222Rn mass balance model, whereas radioactive decay, escape from sea-water interface to air and loss in mixing with the low activity water from open ocean are considered to be the sink of the model. Thus, the imbalance of budget from the model is attributed to submarine groundwater discharge. Calculations show that submarine groundwater discharge flux to Jiaozhou Bay was 24.2 L?m–2?d–1 from September to October in 2011, and 7.8 L?m–2?d–1 from April to May in 2014, respectively. The results of the study also indicate that the nutrient fluxes derived from groundwater during the wet season are lower than those transported by the local rivers, whereas the nutrient fluxes derived from groundwater during the dry season are close to those transported by the local rivers and, what is more, soluble reactive phosphate and silicate fluxes from both groundwater and river are very close to each other. |
| YUAN Xiao-jie,GUO Zhan-rong,MA Zhi-yong,ZHANG Bin,LIU Jie.2015.The Evaluation of Submarine Groundwater Discharge in Jiaozhou Bay Based on 222Rn Mass Balance[J].Acta Geoscientica Sinica,36(2):237-244. |
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