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Governing Processes for Reactive Nitrogen Compounds in the Atmosphere in Relation to Ecosystem, Climatic and Human Health Impacts : Volume 9, Issue 7 (27/07/2012)

By Hertel, O.

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Book Id: WPLBN0003974179
Format Type: PDF Article :
File Size: Pages 75
Reproduction Date: 2015

Title: Governing Processes for Reactive Nitrogen Compounds in the Atmosphere in Relation to Ecosystem, Climatic and Human Health Impacts : Volume 9, Issue 7 (27/07/2012)  
Author: Hertel, O.
Volume: Vol. 9, Issue 7
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Reis, S., Skjøth, C. A., Sutton, M. A., Gyldenkærne, S., Cape, J. N., Erisman, J. W.,...Skiba, U. (2012). Governing Processes for Reactive Nitrogen Compounds in the Atmosphere in Relation to Ecosystem, Climatic and Human Health Impacts : Volume 9, Issue 7 (27/07/2012). Retrieved from

Description: Department of Environmental Science, Aarhus University, P.O. Box 358, Frederiksborgvej 399, 4000 Roskilde, Denmark. Reactive nitrogen (Nr) compounds have different fates in the atmosphere due to differences in governing processes of physical transport, deposition and chemical transformation. Nr compounds addressed here include reduced nitrogen (NHx: ammonia (NH3) and its reaction product ammonium (NH4+)), oxidized nitrogen (NOy: nitrogen monoxide (NO) + nitrogen dioxide (NO2) and their reaction products) as well as organic nitrogen compounds (organic N). Pollution abatement strategies need to take into account these differences in the governing processes of these compounds when assessing their impact on ecosystem services, biodiversity, human health and climate. NOx (NO + NO2) emitted from traffic affects human health in urban areas where the presence of buildings increases the residence time in streets. In urban areas this leads to enhanced exposure of the population to NOx concentrations. NOx emissions have little impact on nearby ecosystems because of the small dry deposition rates of NOx. These compounds need to be converted into nitric acid (HNO3) before removal through deposition is efficient. HNO3 sticks quickly to any surface and is thereby either dry deposited or incorporated into aerosols as nitrate (NO3). In contrast to NOx compounds, NH3 has potentially high impacts on ecosystems near the main agricultural sources of NH3 because of its large ground-level concentrations along with large dry deposition rates. Aerosol phase NH4+ and NO3 contribute significantly to background PM2.5 and PM10 (mass of aerosols with a diameter of less than 2.5 and 10 μm, respectively) with an impact on radiation balance as well as potentially on human health. Little is known quantitatively and qualitatively about organic N in the atmosphere, other than that it contributes a significant fraction of wet-deposited N, and is present in both gaseous and particulate forms in the atmosphere. Further studies are needed to characterize the sources, air chemistry and removal rates of organic N emissions.

Governing processes for reactive nitrogen compounds in the atmosphere in relation to ecosystem, climatic and human health impacts

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