Simulated global coastal ecosystem responses to a half-century increase in river nitrogen loads

doi:10.1029/2021GL094367

Coastal ecosystems are increasingly threatened by anthropogenic stressors such as harmful algal blooms and hypoxia through the combined effects of eutrophication and warming. As a major terrestrial nitrogen source to the ocean, rivers play a key role in shaping coastal nitrogen budgets and biogeochemical cycling. Combining an enhanced-resolution, global ocean-biogeochemical model with temporally-changing river inputs, we estimate that elevated river nitrogen loads alone resulted in a 5.8% increase (16.6 Tg) in the global coastal nitrogen inventory from 1961 to 2010, accompanied by increases in coastal net primary productivity (+4.6%) and benthic detrital flux (+7.3%). The ecosystems most sensitive to added nitrogen were those with long residence times and strong nitrogen limitation. While even enhanced-resolution global models remain limited in their capacity to resolve shelf-scale responses, these basic factors provide two relevant axes for frameworks assessing the comparative coastal ecosystem susceptibility to enhanced nitrogen loads, and the effectiveness of mitigation strategies.

DOI	10.1029/2021GL094367
	Simulated global coastal ecosystem responses to a half-century increase in river nitrogen loads
	Xiao Liu; Charles Stock; John Dunne; Minjin Lee; Elena Shevliakova; Sergey Malyshev; PCD. Milly
	2021-08-12
发表期刊	Geophysical Research Letters
出版年	2021
英文摘要	Coastal ecosystems are increasingly threatened by anthropogenic stressors such as harmful algal blooms and hypoxia through the combined effects of eutrophication and warming. As a major terrestrial nitrogen source to the ocean, rivers play a key role in shaping coastal nitrogen budgets and biogeochemical cycling. Combining an enhanced-resolution, global ocean-biogeochemical model with temporally-changing river inputs, we estimate that elevated river nitrogen loads alone resulted in a 5.8% increase (16.6 Tg) in the global coastal nitrogen inventory from 1961 to 2010, accompanied by increases in coastal net primary productivity (+4.6%) and benthic detrital flux (+7.3%). The ecosystems most sensitive to added nitrogen were those with long residence times and strong nitrogen limitation. While even enhanced-resolution global models remain limited in their capacity to resolve shelf-scale responses, these basic factors provide two relevant axes for frameworks assessing the comparative coastal ecosystem susceptibility to enhanced nitrogen loads, and the effectiveness of mitigation strategies.
领域	气候变化
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/335807
专题	气候变化
推荐引用方式 GB/T 7714	Xiao Liu,Charles Stock,John Dunne,et al. Simulated global coastal ecosystem responses to a half-century increase in river nitrogen loads[J]. Geophysical Research Letters,2021.
APA	Xiao Liu.,Charles Stock.,John Dunne.,Minjin Lee.,Elena Shevliakova.,...&PCD. Milly.(2021).Simulated global coastal ecosystem responses to a half-century increase in river nitrogen loads.Geophysical Research Letters.
MLA	Xiao Liu,et al."Simulated global coastal ecosystem responses to a half-century increase in river nitrogen loads".Geophysical Research Letters (2021).

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