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Reactive Nitrogen in Atmospheric Emission Inventories : Volume 9, Issue 19 (15/10/2009)

By Reis, S.

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Book Id: WPLBN0003995127
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Reactive Nitrogen in Atmospheric Emission Inventories : Volume 9, Issue 19 (15/10/2009)  
Author: Reis, S.
Volume: Vol. 9, Issue 19
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Lijie, G., Zhang, M., Pinder, R. W., Sutton, M. A., & Reis, S. (2009). Reactive Nitrogen in Atmospheric Emission Inventories : Volume 9, Issue 19 (15/10/2009). Retrieved from

Description: Centre for Ecology & Hydrology (CEH), Bush Estate, Penicuik, EH26 0QB, UK. Excess reactive Nitrogen (Nr) has become one of the most pressing environmental problems leading to air pollution, acidification and eutrophication of ecosystems, biodiversity impacts, leaching of nitrates into groundwater and global warming. This paper investigates how current inventories cover emissions of Nr to the atmosphere in Europe, the United States of America, and China. The focus is on anthropogenic sources, assessing the state-of-the-art of quantifying emissions of Ammonia (NH3), Nitrogen Oxides (NOx) and Nitrous Oxide (N2O), the different purposes for which inventories are compiled, and to which extent current inventories meet the needs of atmospheric dispersion modelling. The paper concludes with a discussion of uncertainties involved and a brief outlook on emerging trends in the three regions investigated is conducted.

Key issues are substantial differences in the overall magnitude, but as well in the relative sectoral contribution of emissions in the inventories that have been assessed. While these can be explained by the use of different methodologies and underlying data (e.g. emission factors or activity rates), they may lead to quite different results when using the emission datasets to model ambient air quality or the deposition with atmospheric dispersion models. Hence, differences and uncertainties in emission inventories are not merely of academic interest, but can have direct policy implications when the development of policy actions is based on these model results.

The level of uncertainty of emission estimates varies greatly between substances, regions and emission source sectors. This has implications for the direction of future research needs and indicates how existing gaps between modelled and measured concentration or deposition rates could be most efficiently addressed.

The observed current trends in emissions display decreasing NOx emissions and only slight reductions for NH3 in both Europe and the US. However, in China projections indicate a steep increase of both.

Reactive nitrogen in atmospheric emission inventories

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