Model-based assessment of the environmental impact of deployment of captured carbon (wood chips and calcium carbonate) on the bottom biogeochemistry in the Norwegian Sea
- 1Norwegian Institute for Water Research, Oceanography, Oslo, Norway (evgeniy.yakushev@niva.no)
- 2Running Tide Norway, Tananger, Norway (Tore.Waaland@norseagroup.com)
- 3Running Tide, Portland, Maine, USA (Savage@runningtide.com)
The ocean is the largest natural carbon sink on our planet and provides a range of biological and chemical pathways by which this natural fast-to-slow carbon transfer occurs. This allows the elaboration of carbon removal systems aiming to shift carbon between the fast carbon cycles (years to decades) and slow carbon cycles (100s millions of years). An idea behind this project is to produce the carbon-containing “biomass” consisting of mixtures of sustainably sourced forestry residues (both hardwood and softwood), calcium carbonate, lime kiln dust, and water that is mixed and passively cured. This “biomass” should be deployed to the deep ocean bottom (Norwegian Sea); therefore, containing carbon should be excluded from the fast carbon cycle.
To investigate the spatial and temporal scales of the “biomass” potential negative impact on the water column and benthic biogeochemistry, we used a coupled model consisted from the FABM family C-N-P-Si-O-S-Mn-Fe biogeochemical model BROM and 2-dimensional benthic-pelagic transport model (2DBP), considering vertical and horizontal transport in the water and upper sediments along a transect centered on a impacted region. The model describes in detail the processes of organic matter mineralization in oxygen-depleted conditions that are vitally important for assessing biogeochemical impacts (i.e., denitrification, metal reduction, sulfate reduction). This model was previously used to investigate the impact of fish farming waste on the bottom biogeochemistry (Yakushev et al., 2020). In this study, we evaluated the maximum amount of the “biomass” that can be accumulated on the bottom surface without dramatic changes in the oxygen regime, acidification, and biogeochemistry that can negatively affect the ecosystem.
The work was supported by the Running Tide (https://www.runningtide.com/).
References:
Yakushev E., Wallhead Ph., Renault P., Ilinskaya A., Protsenko E., Yakubov Sh., Pakhomova S. Sweetman A., Dunlop K., Berezina A., Bellerby R., Dale T. 2020.Understanding the Biogeochemical Impacts of Fish Farms using a Benthic-Pelagic Model. Water, 2020, 12, 2384; doi:10.3390/w12092384
How to cite: Yakushev, E., Berezina, A., Roden, N., King, A., Waaland, T., Savage, A., and Tune, A.: Model-based assessment of the environmental impact of deployment of captured carbon (wood chips and calcium carbonate) on the bottom biogeochemistry in the Norwegian Sea, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-14865, https://doi.org/10.5194/egusphere-egu24-14865, 2024.
