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Characterization of Atmospheric Reactive Nitrogen Emissions from Global Agricultural Soils
* 1, 2 , 3, 4 , 1, 2 , 1, 2 , 1, 2
1  Department of Marine, Earth, and Atmospheric Sciences
2  North Carolina State University, Raleigh, NC, USA
3  Dean Emeritus
4  Duke University, Durham, NC


Global nitric oxide (NO) emissions into the atmosphere are projected to increase in the coming years with the increased use of synthetic nitrogen fertilizers and fossil fuel combustion. Here; a statistical model (NO_STAT) is developed for characterizing atmospheric NO emissions from agricultural soil sources; and compared to the performance of other global and regional NO models (e.g., EDGAR and U.S. EPA). The statistical model was developed by developing a multiple linear regression between NO emission and the physicochemical variables. The model was evaluated for 2012 NO emissions. The results indicate that, in comparison to other data sets; the model provides a lower global NO estimate by 59%, (NO_STAT: 0.67 Tg N yr-1; EDGAR: 1.62 Tg N yr-1). We also performed a region-based analysis (U.S., India; and China) using the NO_STAT model. For the U.S., our model produces an estimate that is 47% lower in comparison to EDGAR. Meanwhile; the NO_STAT model estimate for India shows NO emissions 75% lower when compared to other data sets. A lower estimate is also seen for China; where the model estimates NO emissions 82% lower than other data sets. The difference in the global estimates is attributed to the lower estimates in major agricultural countries like China and India. The statistical model captures the spatial distribution of global NO emissions by utilizing a more simplified approach than those used previously. Moreover; the NO_STAT model provides an opportunity to predict future NO emissions in a changing world.

Keywords: global; nitrogen oxides emissions; agricultural soils; predict future nitrogen oxides emissions from agricultural soils; statistical model
Comments on this paper
Anthony Lupo
Thank you
Thank you, I learned a lot about the Nitorgen cycle and modeling it.
Viney Aneja
Dear Tony,

Thanks. We look forward to publishing the manuscript in the Atmosphere Special Issue of the Conference that you are the Guest Editor. All the comments thus far a very positive.

I hope you enjoyed the Thanksgiving holiday safely with your loved ones. Best wishes.


Daniel Tong
A much-needed study to address a global research issue
The new agricultural emission model presented in this study addresses an issue of global significance. While most air pollutants decreased in the past decades, thanks to successful emission control and advances in technology, emissions and atmospheric loading of reactive nitrogen, such as ammonia, were on the rise. Emissions from agricultural soil are highly uncertain, and understudied. The work by the authors, who are experts in reactive nitrogen emissions, presents a much-needed study to advance our collective understanding of this critical issue. It is in my opinion that this work should be published and highlighted in a proper way.

Partha Patra
Excellent Work/Article
This is an excellent article projecting the plausible increase in the global nitric oxide (NO) emissions into the atmosphere in the coming years with the increased use of synthetic nitrogen fertilizers and fossil fuel. This work is of much value and worthy of recognition. Thank you for sharing the article/presentation here.

P. Kalsy
Excellent work by Aneja et al
This is very good research dealing with biogeochemical cycling of reactive nitrogen species. It advances the state of knowledge of reactive ntrogen emissions from soils by the use of synthetic fertilizer; and addresses the role of climate change on such emissions. Very timely work. I strongly recommend recognition of this work.