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Discussion papers
https://doi.org/10.5194/acp-2019-705
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-705
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Sep 2019

Submitted as: research article | 13 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Ammonia measurements from space with the Cross-track Infrared Sounder (CrIS): characteristics and applications

Mark Shephard1, Enrico Dammers1, Karen E. Cady-Pereira2, Shailesh K. Kharol1,3, Jesse Thompson1, Yonatan Gainariu-Matz1,4, Junhua Zhang1, Chris A. McLinden1, Andrew Kovachik1, Michael Moran1, Shabtai Bittman5, Christopher Sioris1, Debora Griffin1, Matthew J. Alvarado2, Chantelle Lonsdale2, Verica Savic-Jovcic1, and Qiong Zheng1 Mark Shephard et al.
  • 1Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada
  • 2Atmospheric and Environmental Research (AER), Lexington, MA, USA
  • 3University of Toronto, Toronto, Ontario, Canada
  • 4University of Waterloo, Waterloo, Ontario, Canada
  • 5Agriculture and Agri-Food Canada (AAFC), Agassiz, British Columbia, Canada

Abstract. Despite its clear importance, the monitoring of atmospheric ammonia, including its sources, sinks and links to the greater nitrogen cycle, remains limited. Satellite data are helping to fill the gap in monitoring from sporadic conventional ground and aircraft-based observations, to better inform policymakers, and assess the impact of any ammonia-related policies. Presented is a description and survey that demonstrate the capabilities of the CrIS ammonia product for monitoring, air quality forecast model evaluation, dry deposition estimates, and emissions estimates from an agricultural hotspot. For model evaluation, while there is a general agreement in the spatial allocation of known major agricultural ammonia hotspots across North America some high-latitude regions during peak forest fire activity often have ammonia concentrations approaching those in agricultural hotspots. The CrIS annual ammonia dry deposition in Canada (excluding Territories) and the U.S. have average and annual variability values of ~0.8 ± 0.08 Tg N year−1 and ~1.23 ± 0.09 Tg N year−1, respectively. These satellite derived dry depositions of reactive nitrogen from NH3 with NO2 show an annual ratio of NH3 compared to their sum (NH3 + NO2) of ~82 % and ~55 % in Canada and U.S., respectively. Furthermore, we show the use of CrIS satellite observations to estimated annual and seasonal emissions near Lethbridge, AB, Canada a region dominated by high emission feedlots also referred to as Concentrated Animal Feeding Operations (CAFOs); the satellite annual emission estimate of 37.1 ± 6.3 kt/yr is at least double the value reported in current bottom-up emission inventories for this region.

Mark Shephard et al.
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Mark Shephard et al.
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Presented is a description and survey demonstrating the capabilities of the CrIS ammonia product for monitoring, air quality forecast model evaluation, dry deposition estimates, and emissions estimates of a agricultural hotspot.
Presented is a description and survey demonstrating the capabilities of the CrIS ammonia product...
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