Preprints
https://doi.org/10.5194/acp-2021-800
https://doi.org/10.5194/acp-2021-800
 
29 Nov 2021
29 Nov 2021
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Potential environmental impact of bromoform from Asparagopsis farming in Australia

Yue Jia1,a, Birgit Quack2, Robert D. Kinley3, Ignacio Pisso4, and Susann Tegtmeier1 Yue Jia et al.
  • 1Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 2GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 3Commonwealth Scientific and Industrial Research Organisation (CSIRO), Agriculture and Food, Townsville, QLD 4811, Australia
  • 4Norwegian Institute for Air Research (NILU), Kjeller, Norway
  • anow at: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, USA

Abstract. To mitigate the rumen enteric methane (CH4) produced by ruminant livestock, Asparagopsis taxiformis is proposed as an additive to ruminant feed. During the cultivation of Asparagopsis taxiformis in the sea or in terrestrial based systems, this macroalgae, like most seaweeds and phytoplankton, produces a large amount of bromoform (CHBr3), which may contribute to ozone depletion once released into the atmosphere. In this study, the impact of CHBr3 on the stratospheric ozone layer resulting from potential emissions from proposed Asparagopsis cultivation in Australia is assessed by weighting the emissions of CHBr3 with the ozone depletion potential (ODP), which is traditionally defined for long-lived halogens but has been also applied to very short lived substances (VSLSs). An annual yield of ~3.5 × 104 Mg dry weight (DW) is required to meet the needs of 50 % of the beef feedlot and dairy cattle in Australia. Our study shows that the intensity and impact of CHBr3 emissions varies dependent on location and cultivation scenarios. Of the proposed locations, tropical farms near the Darwin region are associated with largest CHBr3 ODP values. However, farming of Asparagopsis using either ocean or terrestrial cultivation systems at any of the proposed locations does not have potential to impact the ozone layer. Even if all Asparagopsis farming was performed in Darwin, the emitted CHBr3 would amount to less than 0.016 % of the global ODP-weighted emissions. The remains are relatively small even if the intended annual yield in Darwin is scaled by a factor 30 to meet the global requirements, which will increase the global ODP-weighted emissions by 0.48 %

Yue Jia et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-800', Paul J. Fraser, 23 Jan 2022
    • AC1: 'Reply on RC1', Yue Jia, 27 Mar 2022
  • RC2: 'Review of the manuscript “Potential environmental impact of bromoform from Aspargopsis farming in Australia” by Jia et al., ACPD, 2021.', Rafael Pedro Fernandez, 01 Feb 2022
    • AC2: 'Reply on RC2', Yue Jia, 27 Mar 2022
  • RC3: 'Comment on acp-2021-800', Anonymous Referee #3, 03 Feb 2022
    • AC3: 'Reply on RC3', Yue Jia, 27 Mar 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-800', Paul J. Fraser, 23 Jan 2022
    • AC1: 'Reply on RC1', Yue Jia, 27 Mar 2022
  • RC2: 'Review of the manuscript “Potential environmental impact of bromoform from Aspargopsis farming in Australia” by Jia et al., ACPD, 2021.', Rafael Pedro Fernandez, 01 Feb 2022
    • AC2: 'Reply on RC2', Yue Jia, 27 Mar 2022
  • RC3: 'Comment on acp-2021-800', Anonymous Referee #3, 03 Feb 2022
    • AC3: 'Reply on RC3', Yue Jia, 27 Mar 2022

Yue Jia et al.

Viewed

Total article views: 1,058 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
527 499 32 1,058 33 6 13
  • HTML: 527
  • PDF: 499
  • XML: 32
  • Total: 1,058
  • Supplement: 33
  • BibTeX: 6
  • EndNote: 13
Views and downloads (calculated since 29 Nov 2021)
Cumulative views and downloads (calculated since 29 Nov 2021)

Viewed (geographical distribution)

Total article views: 1,091 (including HTML, PDF, and XML) Thereof 1,091 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 19 May 2022
Download
Short summary
In this study, we assessed the potential risks of bromoform released from Asparagopsis farming near Australia for the stratospheric ozone layer by analyzing different cultivation scenarios. We conclude that the intended operation of Asparagopsis seaweed cultivation farms with an annual yield to meet the need of 50 % feedlot and cattle in either open ocean or terrestrial cultures in Australia will not impact the ozone layer under normal operating conditions.
Altmetrics