环境科学
营养污染
氮气
污染
活性氮
沉积(地质)
氮气循环
生态学
化学
古生物学
有机化学
沉积物
生物
作者
Ouping Deng,Shuai Huang,Chen Wang,Yuming Wei,Yongqiu Xia,Zehui Liu,Xiuming Zhang,Xiao Wu,Ting He,Xiaobo Wu,Mahesh Pradhan,Baojing Gu
标识
DOI:10.1021/acs.est.3c07546
摘要
Nitrogen is an essential nutrient and a major limiting element for the ocean ecosystem. Since the preindustrial era, substantial amounts of nitrogen from terrestrial sources have entered the ocean via rivers, groundwater, and atmospheric deposition. China serves as a key hub in the global nitrogen cycle, but the pathways, sources, and potential mitigation strategies for land-ocean nitrogen transport are unclear. By combining the CHANS, WRF-Chem, and WNF models, we estimated that 8 million tonnes (Tg) of nitrogen was transferred into the ocean in 2017 in China, with atmospheric deposition contributing 1/3. About half variation of the offshore chlorophyll concentration was explained by atmospheric deposition. The Bohai Sea was the hot spot of nitrogen input, estimated at 214 kg N ha–1, while other areas were around 25–51 kg N ha–1. The largest contributors are agricultural systems (4 Tg, 55%), followed by domestic sewage (2 Tg, 21%). Abatement measures could reduce nitrogen export to the ocean by 43%, and mitigating ammonia and nitrogen oxide emissions accounts for 33% of this reduction, highlighting the importance of addressing air pollution in resolving ocean pollution. The cost-benefit analysis suggests the priority of nitrogen reduction in cropland and transport systems for the ocean environment.
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