Preprints
https://doi.org/10.5194/egusphere-2022-525
https://doi.org/10.5194/egusphere-2022-525
13 Jul 2022
 | 13 Jul 2022

Air-sea gas exchange in a seagrass ecosystem

Ryo Dobashi and David T. Ho

Abstract. Seagrass meadows are one of the most productive ecosystems in the world and could play a role in mitigating the increase of atmospheric CO2 from human activities. Understanding their role in the global carbon cycle requires knowledge of air-sea CO2 fluxes and hence knowledge of the gas transfer velocity. In this study, gas transfer velocity and its controlling processes were examined in a seagrass ecosystem in south Florida. Gas transfer velocity was determined using the 3He and SF6 dual tracer technique in Florida Bay near Bob Allen Keys (25.02663° N, 80.68137° W) between 3 and 8 April 2015. The observed gas transfer velocity normalized for CO2 in freshwater at 20 °C, k(600), was 4.8 ± 1.8 cm h-1. The result gas transfer velocities were lower than previous experiments in the coastal and open oceans at the same wind speeds. Therefore, using published wind speed/gas exchange parameterizations would overpredict gas transfer velocities and CO2 fluxes in this area. The deviation in k(600) from other settings was weakly correlated to tidal motion and air-sea temperature difference, implying that wind is the dominant factor driving gas exchange. The lower gas transfer velocity was most likely due to wave attenuation by seagrass and limited wind fetch in this area. A new wind speed/gas exchange parameterization is proposed (k(600)=0.125u102), which might be applicable to other seagrass ecosystems and wind fetch limited environments.

Journal article(s) based on this preprint

23 Mar 2023
Air–sea gas exchange in a seagrass ecosystem – results from a 3He ∕ SF6 tracer release experiment
Ryo Dobashi and David T. Ho
Biogeosciences, 20, 1075–1087, https://doi.org/10.5194/bg-20-1075-2023,https://doi.org/10.5194/bg-20-1075-2023, 2023
Short summary

Ryo Dobashi and David T. Ho

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-525', Anonymous Referee #1, 15 Aug 2022
    • AC1: 'Reply on RC1', Ryo Dobashi, 26 Oct 2022
  • CC1: 'Comment on egusphere-2022-525 (RC2)', Pierre Polsenaere, 29 Aug 2022
    • AC3: 'Reply on CC1', Ryo Dobashi, 26 Oct 2022
  • RC2: 'Comment on egusphere-2022-525 (RC2)', Pierre Polsenaere, 31 Aug 2022
    • AC2: 'Reply on RC2', Ryo Dobashi, 26 Oct 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-525', Anonymous Referee #1, 15 Aug 2022
    • AC1: 'Reply on RC1', Ryo Dobashi, 26 Oct 2022
  • CC1: 'Comment on egusphere-2022-525 (RC2)', Pierre Polsenaere, 29 Aug 2022
    • AC3: 'Reply on CC1', Ryo Dobashi, 26 Oct 2022
  • RC2: 'Comment on egusphere-2022-525 (RC2)', Pierre Polsenaere, 31 Aug 2022
    • AC2: 'Reply on RC2', Ryo Dobashi, 26 Oct 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (28 Oct 2022) by Peter Landschützer
AR by Ryo Dobashi on behalf of the Authors (28 Oct 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (31 Oct 2022) by Peter Landschützer
RR by Pierre Polsenaere (28 Nov 2022)
ED: Publish subject to minor revisions (review by editor) (01 Dec 2022) by Peter Landschützer
AR by Ryo Dobashi on behalf of the Authors (16 Jan 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (24 Jan 2023) by Peter Landschützer
AR by Ryo Dobashi on behalf of the Authors (07 Feb 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

23 Mar 2023
Air–sea gas exchange in a seagrass ecosystem – results from a 3He ∕ SF6 tracer release experiment
Ryo Dobashi and David T. Ho
Biogeosciences, 20, 1075–1087, https://doi.org/10.5194/bg-20-1075-2023,https://doi.org/10.5194/bg-20-1075-2023, 2023
Short summary

Ryo Dobashi and David T. Ho

Data sets

Tracer_release_experiment_Florida_bay Ryo Dobashi https://doi.org/10.5281/zenodo.6730934

Ryo Dobashi and David T. Ho

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Seagrass meadows are productive ecosystems and bury much carbon. Understanding their role in the global carbon cycle requires knowledge of air-sea CO2 fluxes and hence the knowledge of gas transfer velocity (k). In this study, k was determined from the dual tracer technique in Florida Bay. The observed gas transfer velocity was lower than previous studies in the coastal and open oceans at the same wind speeds, most likely due to wave attenuation by seagrass and limited wind fetch in this area.