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1. Daily Cropland Soil NO _x Emissions Identified by TROPOMI and SMAP

   https://doi.org/10.1029/2020GL089949  

   Huber, Daniel E.; Steiner, Allison L.; Kort, Eric A. (November 2020, Geophysical Research Letters)

   Abstract We use TROPOMI (TROPOspheric Monitoring Instrument) tropospheric nitrogen dioxide (NO₂) measurements to identify cropland soil nitrogen oxide (NO_x = NO + NO₂) emissions at daily to seasonal scales in the U.S. Southern Mississippi River Valley. Evaluating 1.5 years of TROPOMI observations with a box model, we observe seasonality in local NO_xenhancements and estimate maximum cropland soil NO_xemissions (15–34 ng N m⁻² s⁻¹) early in growing season (May–June). We observe soil NO_xpulsing in response to daily decreases in volumetric soil moisture (VSM) as measured by the Soil Moisture Active Passive (SMAP) satellite. Daily NO₂enhancements reach up to 0.8 × 10¹⁵ molecules cm⁻²4–8 days after precipitation when VSM decreases to ~30%, reflecting emissions behavior distinct from previously defined soil NO_xpulse events. This demonstrates that TROPOMI NO₂observations, combined with observations of underlying process controls (e.g., soil moisture), can constrain soil NO_xprocesses from space. 

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2. Prediction of NO _x Emissions from Compression Ignition Engines Using Ensemble Learning-Based Models with Physical Interpretability

   https://doi.org/10.4271/2021-24-0082  

   Panneer Selvam, Harish; Shekhar, Shashi; Northrop, William F. (September 2021, SAE Technical Paper Series)
3. Influence of the NO/NO ₂ Ratio on Oxidation Product Distributions under High-NO Conditions

   https://doi.org/10.1021/acs.est.0c07621  

   Nihill, Kevin J.; Ye, Qing; Majluf, Francesca; Krechmer, Jordan E.; Canagaratna, Manjula R.; Kroll, Jesse H. (May 2021, Environmental Science & Technology)

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4. Accounting for nature's intermittency and growth while mitigating NO ₂ emissions by technoecological synergistic design—Application to a chloralkali process

   https://doi.org/10.1002/amp2.10013  

   Shah, Utkarsh; Bakshi, Bhavik R. (March 2019, Journal of Advanced Manufacturing and Processing)

   By including ecosystems in process design, it becomes possible to develop synergies between technological and ecological systems to establish islands of environmental sustainability. Such an approach can also ensure that human activities do not degrade ecosystems—the very systems that are essential for our sustainability. This work evaluates the idea of including ecosystems as unit operations in process design [1] while accounting for the intermittency and growth of ecological systems. The technology of selective catalytic reduction (SCR) and a forest ecosystem are both capable of mitigating nitrogen dioxide (NO₂) emissions and are designed to support a chloralkali process near Galveston, Texas. The cost of the forest ecosystem taking up NO₂is found to be one‐fourth of the cost of the SCR. However, as the capacity of vegetation to take up emissions varies with seasons, the chloralkali process needs to adjust its manufacturing rate accordingly. The result of such adaptation to local ecosystems can be manufacturing with net zero emissions and a step toward environmental sustainability. This study demonstrates the need for further research to address the practical and theoretical aspects of industry and ecosystems to establish mutually beneficial relationships that are economically, ecologically, and societally viable. 

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5. Cross Sections for Electron Collisions with NO, N ₂ O, and NO ₂

   https://doi.org/10.1063/1.5114722  

   Song, Mi-Young; Yoon, Jung-Sik; Cho, Hyuck; Karwasz, Grzegorz P.; Kokoouline, Viatcheslav; Nakamura, Yoshiharu; Tennyson, Jonathan (December 2019, Journal of Physical and Chemical Reference Data)