Preprints
https://doi.org/10.5194/acp-2021-222
https://doi.org/10.5194/acp-2021-222

  30 Apr 2021

30 Apr 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Trifluoroacetic acid deposition from emissions of HFO-1234yf in India, China and the Middle East

Liji M. David1,2, Mary Barth3, Lena Höglund-Isaksson4, Pallav Purohit4, Guus J. M. Velders5,6, Sam Glaser1,a, and Akkihebbal R. Ravishankara1,2 Liji M. David et al.
  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
  • 2Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA
  • 3Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado
  • 4Air Quality and Greenhouse Gases Program, International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, 2361, Laxenburg, Austria
  • 5National Institute for Public Health and the Environment (RIVM), PO Box 1, 3720 BA Bilthoven, The Netherlands
  • 6Institute for Marine and Atmospheric Research Utrecht, Utrecht University, The Netherlands
  • acurrently at: Tufts University, Medford, MA

Abstract. We have investigated trifluoroacetic acid (TFA) formation from emissions of HFO-1234yf, its dry and wet deposition, and rainwater concentration over India, China, and the Middle East with GEOS-Chem and WRF-Chem models. We estimated the TFA deposition and rainwater concentrations between 2020 and 2040 for four previously published HFO-1234yf emission scenarios to bound the possible levels of TFA. We evaluated the capability of GEOS-Chem to capture the wet deposition process by comparing calculated sulfate in rainwater with observations. Our calculated TFA amounts over the U.S., Europe, and China were comparable to those previously reported when normalized to the same emission. A significant proportion of TFA was found to be deposited outside the emission regions. The mean and the extremes of TFA rainwater concentrations calculated for the four emission scenarios from GEOS-Chem and WRF-Chem were orders of magnitude below the no observable effect concentration. The ecological and human health impacts now and the continued use of HFO-1234yf in India, China, and the Middle East are estimated to be insignificant based on the current understanding, as summarized by Neale et al. (2021).

Liji M. David et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-222', Anonymous Referee #1, 10 May 2021
    • AC1: 'Reply on RC1', A.R.,. Ravishankara, 29 Jul 2021
  • RC2: 'Comment on acp-2021-222', Anonymous Referee #2, 23 May 2021
    • AC2: 'Reply on RC2', A.R.,. Ravishankara, 29 Jul 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-222', Anonymous Referee #1, 10 May 2021
    • AC1: 'Reply on RC1', A.R.,. Ravishankara, 29 Jul 2021
  • RC2: 'Comment on acp-2021-222', Anonymous Referee #2, 23 May 2021
    • AC2: 'Reply on RC2', A.R.,. Ravishankara, 29 Jul 2021

Liji M. David et al.

Liji M. David et al.

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Short summary
We calculated the expected concentrations of trifluoroacetic acid (TFA) from the atmospheric breakdown of HFO-1234 yf (CF3CF=CH2), a substitute for global warming hydrofluorocarbons, emitted now and in the future by India, China, and the Middle East. We used two chemical transport models. We conclude that the projected emissions through 2040 would not be detrimental given the current knowledge of the effects of TFA on humans and ecosystems. 
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