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Worldwide Biogenic Soil NoX Emissions Inferred from Omi No2 Observations : Volume 14, Issue 10 (05/06/2014)

By Vinken, G. C. M.

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Book Id: WPLBN0003996916
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Worldwide Biogenic Soil NoX Emissions Inferred from Omi No2 Observations : Volume 14, Issue 10 (05/06/2014)  
Author: Vinken, G. C. M.
Volume: Vol. 14, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Maasakkers, J. D., Adon, M., Martin, R. V., M. Vinke, G. C., & Boersma, K. F. (2014). Worldwide Biogenic Soil NoX Emissions Inferred from Omi No2 Observations : Volume 14, Issue 10 (05/06/2014). Retrieved from

Description: Department of Applied Physics, Eindhoven University of Technology, Eindhoven, the Netherlands. Biogenic NOx emissions from soils are a large natural source with substantial uncertainties in global bottom-up estimates (ranging from 4 to 27 Tg N yr−1). We reduce this range in emission estimates, and present a top-down soil NOx emission inventory for 2005 based on retrieved tropospheric NO2 columns from the Ozone Monitoring Instrument (OMI). We used a state-of-science soil NOx emission inventory (Hudman et al., 2012) as a priori in the GEOS-Chem chemistry transport model to identify 11 regions where tropospheric NO2 columns are dominated by soil NOx emissions. Strong correlations between soil NOx emissions and simulated NO2 columns indicated that spatial patterns in simulated NO2 columns in these regions indeed reflect the underlying soil NOx emissions. Subsequently, we used a mass-balance approach to constrain emissions for these 11 regions on all major continents using OMI observed and GEOS-Chem simulated tropospheric NO2 columns. We found that responses of simulated NO2 columns to changing NOx emissions were suppressed over low NOx regions, and accounted for these non-linearities in our inversion approach. In general, our approach suggests that emissions need to be increased in most regions. Our OMI top-down soil NOx inventory amounts to 10.0 Tg N for 2005 when only constraining the 11 regions, and 12.9 Tg N when extrapolating the constraints globally. Substantial regional differences exist (ranging from −40% to +90%), and globally our top-down inventory is 4–35% higher than the GEOS-Chem a priori (9.6 Tg N yr−1). We evaluated NO2 concentrations simulated with our new OMI top-down inventory against surface NO2 measurements from monitoring stations in Africa, the USA, and Europe. Although this comparison is complicated by several factors, we find an encouraging improved agreement when using the OMI top-down inventory compared to using the a priori inventory. To our knowledge, this study provides, for the first time, specific constraints on soil NOx emissions on all major continents using OMI NO2 columns. Our results rule out the high end of reported soil NOx emission estimates, and suggest that global emissions are most likely around 10–13 Tg N yr−1.

Worldwide biogenic soil NOx emissions inferred from OMI NO2 observations

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