Preprints
https://doi.org/10.5194/egusphere-2024-2856
https://doi.org/10.5194/egusphere-2024-2856
04 Nov 2024
 | 04 Nov 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Monitoring of total and off-road NOx emissions from Canadian oil sands surface mining using the Ozone Monitoring Instrument

Chris McLinden, Debora Griffin, Vitali Fioletov, Junhua Zhang, Enrico Dammers, Cristen Adams, Mallory Loria, Nicolay Krotkov, and Lok Lamsal

Abstract. The oil sands in Alberta, Canada is a significant source of air pollution. Observations from the Ozone Monitoring Instrument (OMI) on the NASA Aura satellite have been used to quantify NOx emissions from the surface mining region of the oil sands. Two related emissions methods were utilized, one for point and one for area sources, where OMI vertical columns densities of NO2 were combined with winds from a meteorological reanalysis and a two-dimensional exponentially-modified Gaussian (EMG) plume model. This work better connects the two (point and area) emissions methods, discusses the interpretation of fit parameters, and the ability of OMI (and other sensors) to resolve emissions between neighbouring sources.

The two methods employed, in good agreement with each other, indicated an increase in emissions from about 55 to 80 kt[NO2]/yr between 2005–2011, and flat thereafter. Reported emissions were typically 0–15 % smaller, consistent to within uncertainties. In an extension of this methodology, OMI observations were combined with reported point source emissions to derive the more uncertain emissions component from the large off-road mining fleet. These were found to make up about 60 % of total NOx emissions, also consistent with reported emissions. The OMI-derived 1.3 %/year increase in fleet emissions and the 5.9 %/year increase in bitumen mined, generally a good proxy for fleet emissions, can be reconciled by considering the evolution of the mine fleet over this period. OMI is therefore able to track the transition from US EPA Tier 1 standards, through Tier 4 standards, to the present, and in so doing demonstrates the efficacy of this policy. Furthermore, this analysis shows that had the fleet remained at Tier 1 this source would currently be emitting an additional 25 kt/yr.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Chris McLinden, Debora Griffin, Vitali Fioletov, Junhua Zhang, Enrico Dammers, Cristen Adams, Mallory Loria, Nicolay Krotkov, and Lok Lamsal

Status: open (until 16 Dec 2024)

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Chris McLinden, Debora Griffin, Vitali Fioletov, Junhua Zhang, Enrico Dammers, Cristen Adams, Mallory Loria, Nicolay Krotkov, and Lok Lamsal

Data sets

OMI-ECCC NO2 over the Canadian Oil Sands C. McLinden and D. Griffin https://collaboration.cmc.ec.gc.ca/cmc/arqi/OilSands_satellite_NO2data/

Chris McLinden, Debora Griffin, Vitali Fioletov, Junhua Zhang, Enrico Dammers, Cristen Adams, Mallory Loria, Nicolay Krotkov, and Lok Lamsal

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Latest update: 12 Dec 2024
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Short summary
The Ozone Monitoring Instrument (OMI) was used to understand the evolution of NOx emissions from the Canadian oil sands. OMI NO2 combined with winds and reported stack emissions, found emissions from the heavy-hauler mine fleet increased by about 20 % since 2005, whereas the total oil sands mined nearly doubled. This difference is a result of emissions standards limiting NOx emissions becoming more stringent over this period confirming the efficacy of the policy enacting these standards.