Simulated Global Coastal Ecosystem Responses to a Half-Century Increase in River Nitrogen Loads

Liu, Xiao; Stock, Charles A.; Dunne, John P.; Lee, Minjin; Shevliakova, Elena; Malyshev, Sergey; Milly, Paul C. D.

doi:10.1029/2021GL094367

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Simulated Global Coastal Ecosystem Responses to a Half-Century Increase in River Nitrogen Loads

2021
By Liu, Xiao ; Stock, Charles A. ; Dunne, John P. ; ...
Source: Geophysical Research Letters, 48(17)

[PDF-2.03 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Liu, Xiao ; Stock, Charles A. ; Dunne, John P. ; Lee, Minjin ; Shevliakova, Elena ; ... More +

Liu, Xiao ; Stock, Charles A. ; Dunne, John P. ; Lee, Minjin ; Shevliakova, Elena ; Malyshev, Sergey ; Milly, Paul C. D. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; CIMES (Cooperative Institute for Modeling the Earth System)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; CIMES (Cooperative Institute for Modeling the Earth System) Less -
Description:

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
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Biogeochemical Model Coastal Coastal Ecosystem Ecosystem Hypoxia Nitrogen
Source:

Geophysical Research Letters, 48(17)
DOI:

https://doi.org/10.1029/2021GL094367
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4320123
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CC BY
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Submitted
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urn:sha256:148270f6d913c5b6d2f5673b145db557836319c6193922f403635a88983925e5
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https://repository.library.noaa.gov/view/noaa/32300/noaa_32300_DS1.pdf
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Simulated Global Coastal Ecosystem Responses to a Half-Century Increase in River Nitrogen Loads

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