Global land-ocean linkage: direct inputs of nitrogen to coastal waters via submarine groundwater discharge
Global land-ocean linkage: direct inputs of nitrogen to coastal waters via submarine groundwater discharge
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DOI：
10.1088/1748-9326/8/3/034035
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发表时间：
2013-07-01
影响因子：
6.7
通讯作者：
Bouwman, A. F.
中科院分区：
文献类型：
--
作者：
Beusen, A. H. W.;Slomp, C. P.;Bouwman, A. F.
海底地下水排放（SGD），即地下水从含水层渗漏到沿海沃茨，在沿海富营养化中的作用主要在北美和欧洲海岸线得到证实，但在其他区域却很少量化。在这里，我们提出了第一个空间上明确的全球估计N输入通过SGD沿海沃茨，并表明它已增加约1.0至1.4 Tg的硝酸盐（NO3-N），每年在20世纪世纪的下半年。由于这种增加并不伴随着地下水磷（P）和硅（Si）的等量增加，硝酸盐的SGD传输是沿海沃茨有害藻华发展的重要因素。地下水氮通量与高径流和陆地上密集的人类活动有关，东南亚，北美和中美洲的部分地区以及欧洲是热点。
The role of submarine groundwater discharge (SGD), the leakage of groundwater from aquifers into coastal waters, in coastal eutrophication has been demonstrated mostly for the North American and European coastlines, but poorly quantified in other regions. Here, we present the first spatially explicit global estimates of N inputs via SGD to coastal waters and show that it has increased from about 1.0 to 1.4 Tg of nitrate (NO3-N) per year over the second half of the 20th century. Since this increase is not accompanied by an equivalent increase of groundwater phosphorus (P) and silicon (Si), SGD transport of nitrate is an important factor for the development of harmful algal blooms in coastal waters. Groundwater fluxes of N are linked to areas with high runoff and intensive anthropogenic activity on land, with Southeast Asia, parts of North and Central America, and Europe being hot spots.