海底地下水排泄(SGD)是全球水循环的重要组成部分,也是向海洋输送营养盐等各类化学物质的必要途径之一。以辽东湾东部营口海域为研究对象,以天然镭同位素(224Ra、228Ra)作为示踪剂,建立镭质量平衡模型并加以改进,进而探讨再循环海水(RSGD)对研究区内水体刷新时间、SGD及携带氮磷营养盐通量的影响程度。结果表明:利用镭质量平衡模型计算水体刷新时间为9 d,改进后的镭质量平衡模型计算出的水体刷新时间为14.35~18.11 d;传统模型下SGD通量为(3.01~3.51)×108 m3/d。改进模型评估的SGD通量为(3.55~4.39)×108 m3/d,改进模型评估的水体刷新时间与SGD均明显高于初始模型,其中水体刷新时间增加了59.44%~101.22%;SGD通量增加了17.94%~25.07%。在此基础上,地下水向海输入的氮、磷营养盐通量在考虑RSGD的情况下分别为1.73×108、1.52×109 mol/d。研究结果证明了RSGD对SGD和营养盐通量存在较大影响,为营口海域生态环境评估提供了基础数据。
Abstract
Submarine groundwater discharge (SGD) represents an essential part of the global water cycle and one of the vital ways to transport various chemical substances such as nutrients to the ocean.The influences of recirculated seawater (RSGD) on water body refresh time, SGD, and the flux of nitrogen and phosphorus nutrients in Yingkou sea area in the eastern part of Liaodong Bay were investigated by establishing and improving the radium mass balance model with natural radium isotopes (224Ra and 228Ra) as tracers.The water refresh time calculated by the radium mass balance model is 9 days while by the improved radium mass balance model 14.35-18.11 days.The SGD flux in the traditional model is (3.01-3.51)×108 m3/d while in the improved model (3.55-4.39)×108 m3/d.The water refresh time and SGD calculated by the improved model increased by 59.44%-101.22% and 17.94%-25.07%, respectively, compared with those by the traditional model.Moreover, the nitrogen and phosphorus nutrient fluxes from groundwater to the sea are 1.73×108 mol/d and 1.52×109 mol/d, respectively, in consideration of RSGD.In conclusion, RSGD has a remarkable impact on SGD and nutrient fluxes.
关键词
海底地下水排泄 /
镭同位素 /
改进镭质量平衡模型 /
氮磷营养盐 /
营口海域
Key words
submarine groundwater discharge /
radium isotopes /
improved radium mass balance model /
nitrogen and phosphorus nutrients /
Yingkou sea area
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基金
国家自然科学基金面上项目(41772235);中央高校基本科研业务费项目(B210202108)
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