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Unexpected response of nitrogen deposition to nitrogen oxide controls and implications for land carbon sink.
- Source :
-
Nature communications [Nat Commun] 2022 Jun 06; Vol. 13 (1), pp. 3126. Date of Electronic Publication: 2022 Jun 06. - Publication Year :
- 2022
-
Abstract
- Terrestrial ecosystems in China receive the world's largest amount of reactive nitrogen (N) deposition. Recent controls on nitrogen oxides (NO <subscript>x</subscript> = NO + NO <subscript>2</subscript> ) emissions in China to tackle air pollution are expected to decrease N deposition, yet the observed N deposition fluxes remain almost stagnant. Here we show that the effectiveness of NO <subscript>x</subscript> emission controls for reducing oxidized N (NO <subscript>y</subscript> = NO <subscript>x</subscript> + its oxidation products) deposition is unforeseen in Eastern China, with one-unit reduction in NO <subscript>x</subscript> emission leading to only 55‒76% reductions in NO <subscript>y</subscript> -N deposition, as opposed to the high effectiveness (around 100%) in both Southern China and the United States. Using an atmospheric chemical transport model, we demonstrate that this unexpected weakened response of N deposition is attributable to the enhanced atmospheric oxidizing capacity by NO <subscript>x</subscript> emissions reductions. The decline in N deposition could bear a penalty on terrestrial carbon sinks and should be taken into account when developing pathways for China's carbon neutrality.<br /> (© 2022. The Author(s).)
Details
- Language :
- English
- ISSN :
- 2041-1723
- Volume :
- 13
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Nature communications
- Publication Type :
- Academic Journal
- Accession number :
- 35668096
- Full Text :
- https://doi.org/10.1038/s41467-022-30854-y