Geoscience center, University of Göttingen, Goldschmidstrasse 3, 37077, Göttingen, Germany.
Department of Civil Engineering and School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada.
Nat Commun. 2020 Mar 9;11(1):1260. doi: 10.1038/s41467-020-15064-8.
The flow of fresh groundwater may provide substantial inputs of nutrients and solutes to the oceans. However, the extent to which hydrogeological parameters control groundwater flow to the world's oceans has not been quantified systematically. Here we present a spatially resolved global model of coastal groundwater discharge to show that the contribution of fresh groundwater accounts for ~0.6% (0.004%-1.3%) of the total freshwater input and ~2% (0.003%-7.7%) of the solute input for carbon, nitrogen, silica and strontium. However, the coastal discharge of fresh groundwater and nutrients displays a high spatial variability and for an estimated 26% (0.4%-39%) of the world's estuaries, 17% (0.3%-31%) of the salt marshes and 14% (0.1-26%) of the coral reefs, the flux of terrestrial groundwater exceeds 25% of the river flux and poses a risk for pollution and eutrophication.
新鲜地下水的流动可能会向海洋输入大量的营养物质和溶解物。然而，水文地质参数控制地下水向世界海洋流动的程度尚未得到系统地量化。在这里，我们提出了一个沿海地下水流的空间分辨率全球模型，以表明新鲜地下水的贡献占总淡水输入的约 0.6%（0.004%-1.3%），占碳、氮、硅和锶等溶质输入的约 2%（0.003%-7.7%）。然而，新鲜地下水和养分的沿海排放具有很高的空间变异性，估计全球有 26%（0.4%-39%）的河口、17%（0.3%-31%）的盐沼和 14%（0.1-26%）的珊瑚礁，其地下水的通量超过了河流通量的 25%，对污染和富营养化构成了威胁。
