Changes of nitrogen deposition in China from 1980 to 2018

A - Papers appearing in refereed journals

Wen, Z., Xu, W., Li, Q., Han, M., Tang, A., Zhang, Y., Luo, X., Shen, J., Wang, W., Li, K., Pan, Y., Zhang, L., Li, W., Collett, J. L., Zhong, B., Wang, X., Goulding, K. W. T., Zhang, F. and Liu, X. 2020. Changes of nitrogen deposition in China from 1980 to 2018. Environment International. 144, p. 106022. https://doi.org/10.1016/j.envint.2020.106022

AuthorsWen, Z., Xu, W., Li, Q., Han, M., Tang, A., Zhang, Y., Luo, X., Shen, J., Wang, W., Li, K., Pan, Y., Zhang, L., Li, W., Collett, J. L., Zhong, B., Wang, X., Goulding, K. W. T., Zhang, F. and Liu, X.
Abstract

China has experienced a dramatic change in atmospheric reactive nitrogen (Nr) emissions over the past four decades. However, it remains unclear how nitrogen (N) deposition has responded to increases and/or decreases in Nr emissions. This study quantitatively assesses temporal and spatial variations in measurements of bulk and calculated dry N deposition in China from 1980 to 2018. A long-term database (1980–2018) shows that bulk N deposition peaked in around 2000, and had declined by 45% by 2016–2018. Recent bulk and dry N deposition (based on monitoring from 2011 to 2018) decreased from 2011 to 2018, with current average values of 19.4 ± 0.8 and 20.6 ± 0.4 kg N ha−1 yr−1, respectively. Oxidized N deposition, especially dry deposition, decreased after 2010 due to NOx emission controls. In contrast, reduced N deposition was approximately constant, with reductions in bulk NH4+-N deposition offset by a continuous increase in dry NH3 deposition. Elevated NH3 concentrations were found at nationwide monitoring sites even at urban sites, suggesting a strong influence of both agricultural and non-agricultural sources. Current emission controls are reducing Nr emissions and deposition but further mitigation measures are needed, especially of NH3, built on broader regional emission control strategies.

KeywordsReactive nitrogen ; Atmospheric deposition; Ammonia; Air pollution; Emission control
Year of Publication2020
JournalEnvironment International
Journal citation144, p. 106022
Digital Object Identifier (DOI)https://doi.org/10.1016/j.envint.2020.106022
Web address (URL)https://doi.org/10.1016/j.envint.2020.106022
Open accessPublished as ‘gold’ (paid) open access
FunderBBSRC Newton funding
Funder project or codeUK - China Virtual Joint Centre for Improved Nitrogen Agronomy (CINAG)
Publisher's version
Output statusPublished
Publication dates
OnlineJul 2020
Publication process dates
Accepted28 Jul 2020
PublisherElsevier
ISSN0160-4120

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