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大规模的海底地下水排放主导着中国海岸的营养投入

Tianyi Zhu^1,2,3,4, Shibin Zhao^1,2, Bochao Xu^5,6

¹Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, P. R. China.

Nature communications

|March 26, 2025

概括

海底地下水排放 (SGD) 显著影响中国

科学领域:

海洋化学和沿海生态学
地质化学和环境科学
海洋学和水资源管理

背景情况:

海底地下水排放 (SGD) 是沿海生态系统的关键营养途径.
现有的SGD估计通常是局部化的,并且不区分新鲜 (FSGD) 和再循环 (RSGD) 来源.
了解不同类型的SGD的规模和营养贡献对于沿海管理至关重要.

研究的目的:

量化大规模的新鲜 (FSGD) 和循环 (RSGD) 海底地下水排放在中国沿海.
为了确定与不同的SGD组件相关的营养负载.
评估SGD对中国沿海营养预算的总体贡献.

主要方法:

收集和分析了大量的地下水和海水/数据 (分别约2,000个和10,000个样本).
应用蒙特卡洛模拟来量化SGD估计中的不确定性.
根据SGD的体积和度计算营养流 (DIN,P,Si).

主要成果:

新鲜SGD (FSGD) 占总SGD的一小部分 (~2%),但具有相当大的营养负载,与循环SGD (RSGD) 相比.
SGD是中国沿海水域的主导营养来源,在总营养投入中贡献了19-54%.
来自SGD的营养流包括大约395 Gmol a-1的溶解无机,2.9 Gmol a-1的和581 Gmol a-1的.

结论:

海底地下水排放 (SGD) 在维持中国受严重影响的沿海地区的初级生产方面发挥着至关重要的作用.
SGD的营养投入超过了来自大气沉积和河流的营养投入,这凸显了它在沿海生物地球化学循环中的重要性.
对FSGD和RSGD进行准确,大规模的评估对于有效的沿海区域管理和生态保护至关重要.

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