re 3/21 post by cnantan.
Indeed the NAS study mentions but does not elaborate at length on ocean storage options, and in particular those that could emphasize carbon mineralization. I’m not certain this is the point of your question or not, but if so, I might call your attention to previous work on feasibility and capability of sub-ocean storage options in basaltic lavas. No at-sea demonstrations have yet been conducted, however there is significant potential for scale-up and benefit in these environments, both via industrial and direct air capture solutions. Some background references include:
Goldberg, D., and A. L. Slagle. 2009. A global assessment of deep-sea basalt sites for carbon sequestration. Energy Procedia 1(1):3675-3682. DOI: https://org/10.1016/j.egypro.2009.02.165.
Goldberg, D. S., T. Takahashi, and A. L. Slagle. 2008. Carbon dioxide sequestration in deep-sea basalt. Proceedings of the National Academy of Sciences of the United States of America 105(29):9920-9925. DOI: 10.1073/pnas.0804397105.
Goldberg, D. S., D. V. Kent, and P. E. Olsen. 2010. Potential on-shore and o -shore reservoirs for CO2 sequestration in Central Atlantic magmatic province basalts. Proceedings of the National Academy of Sciences of the United States of America 107(4):1327-1332. DOI: 10.1073/pnas.0913721107.
Goldberg, D., K. Lackner, P. Han, A. Slagle, and T. Wang, 2013, Co-location of air capture, sub-ocean CO2 sequestration, and energy production on the Kerguelen plateau, Environ. Sci. & Technol., 47(13), 7521-7529, doi:10.1021/es401531y.
Goldberg, D. and K. Lackner, 2015, Creating negative emissions at remote CO2 sequestration sites, Greenhouse Gases: Sci. & Technol., 5:1–3, doi: 10.1002/ghg.1489, available online at: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2152-3878/earlyview.
Snæbjörnsdóttir, S.Ó., F. Wiese, T. Fridriksson, H. Ármannsson, G.M. Einarsson, and S.R. Gislason. “CO2 storage potential of basaltic rocks
in Iceland and the oceanic ridges” Energy Procedia 63 (2014): 4585–4600.
Gutknecht, V., S.Ó., Snæbjörnsdóttir, B. Sigfússon, E. S. Aradóttir, and L. Charles. Creating a carbon dioxide removal solution by combining rapid
mineralization of CO2 with direct air capture"
Energy Procedia 146 (2018): 129-134.