Preprints
https://doi.org/10.5194/acp-2021-549
https://doi.org/10.5194/acp-2021-549

  08 Sep 2021

08 Sep 2021

Review status: this preprint is currently under review for the journal ACP.

An Ensemble-Variational Inversion System for the Estimation of Ammonia Emissions using CrIS Satellite Ammonia Retrievals

Michael Sitwell and Mark Shephard Michael Sitwell and Mark Shephard
  • Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario, Canada

Abstract. An ensemble-variational inversion system is developed for the estimation of ammonia emissions using ammonia retrievals from the Cross-track Infrared Sounder (CrIS) for use in the Global Environmental Multiscale – Modelling Air quality and Chemistry (GEM-MACH) chemical weather model. A novel hybrid method to compare logarithmic retrieval parameters to model profiles is presented. Inversions for the monthly mean ammonia emissions over North America were performed for May to August 2016. Inversions using the hybrid comparison method increased ammonia emissions at most locations within the model domain, with total monthly mean emissions increasing by 11–41 %. The use of these revised emissions in GEM-MACH reduced biases with surface ammonia observations by as much as 25 %. The revised ammonia emissions also improved the forecasts of total (fine+coarse) ammonium and nitrate and ammonium wet deposition, with biases decreasing by as much as 13 %, but did not improve the forecasts of just the fine components of ammonium and nitrate. An additional area of 1.3 × 105 km2 of upland forests in Canada were estimated to exceed the ecosystem's critical load due to the changes in ammonia deposition from the inversion. A comparison of biases resulting from inversions using different comparison methods shows favourable results for the hybrid comparison method.

Michael Sitwell and Mark Shephard

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-549', Anonymous Referee #2, 29 Sep 2021
    • AC1: 'Reply on RC1', Michael Sitwell, 14 Oct 2021
  • RC2: 'Comment on acp-2021-549', Anonymous Referee #1, 15 Nov 2021

Michael Sitwell and Mark Shephard

Michael Sitwell and Mark Shephard

Viewed

Total article views: 488 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
382 90 16 488 47 4 6
  • HTML: 382
  • PDF: 90
  • XML: 16
  • Total: 488
  • Supplement: 47
  • BibTeX: 4
  • EndNote: 6
Views and downloads (calculated since 08 Sep 2021)
Cumulative views and downloads (calculated since 08 Sep 2021)

Viewed (geographical distribution)

Total article views: 480 (including HTML, PDF, and XML) Thereof 480 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 26 Nov 2021
Download
Short summary
Observations of ammonia made using the satellite-borne CrIS instrument were used to improve the ammonia emissions used in the GEM-MACH model. These observations were used to refine estimates of the monthly mean ammonia emissions over North America for May to August 2016. The updated ammonia emissions reduced biases of GEM-MACH surface ammonia fields with surface observations and showed some improvements in the forecasting of species involved in inorganic particulate matter formation.
Altmetrics