Nitrogen cycling in China marginal seas: Progress and challenges
Marginal seas play a critical role in the earth's systems as hotspots of microbially-mediated nitrogen (N) cycling. Meanwhile, human activities and global changes strongly impact this land-ocean boundary. Understanding the key N cycling processes and their climatic feedback is crucial for predi...
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Published in | Marine chemistry Vol. 265-266; p. 104421 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.09.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Marginal seas play a critical role in the earth's systems as hotspots of microbially-mediated nitrogen (N) cycling. Meanwhile, human activities and global changes strongly impact this land-ocean boundary. Understanding the key N cycling processes and their climatic feedback is crucial for predicting the status of earth in the future and developing global N-driven physical-biogeochemical models. Although N cycling processes in China marginal seas have received great attention, a systematic analysis over a large geographical scale from estuaries to the deep ocean is still missing. This gap hinders us from concretely determining the sources and fate of N and predicting their responses to changing environments. This review compiles and re-analyzes historical data of source terms, encompassing N fluxes from riverine inputs and atmospheric deposition, as well as N2 fixation. We also examine sinks related to sedimentary N loss processes (denitrification and anammox), internal N cycling processes (uptake and nitrification), short-lived N intermediates, and nitrous oxide, by considering rates, spatiotemporal variability, and environmental factors. Finally, we outline future research directions pertaining to marine N cycling in China marginal seas. |
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ISSN: | 0304-4203 |
DOI: | 10.1016/j.marchem.2024.104421 |