Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration

Catriona L. Hurd (Lead / Corresponding author), Cliff S. Law, Lennart T. Bach, Damon Britton, Mark Hovenden, Ellie Paine, John A. Raven, Veronica Tamsitt, Philip W. Boyd

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Carbon sequestration is defined as the secure storage of carbon-containing molecules for >100 years, and in the context of carbon dioxide removal for climate mitigation, the origin of this CO 2 is from the atmosphere. On land, trees globally sequester substantial amounts of carbon in woody biomass, and an analogous role for seaweeds in ocean carbon sequestration has been suggested. The purposeful expansion of natural seaweed beds and aquaculture systems, including into the open ocean (ocean afforestation), has been proposed as a method of increasing carbon sequestration and use in carbon trading and offset schemes. However, to verify whether CO 2 fixed by seaweeds through photosynthesis leads to carbon sequestration is extremely complex in the marine environment compared to terrestrial systems, because of the need to jointly consider: the comparatively rapid turnover of seaweed biomass, tracing the fate of carbon via particulate and dissolved organic carbon pathways in dynamic coastal waters, and the key role of atmosphere–ocean CO 2 exchange. We propose a Forensic Carbon Accounting approach, in which a thorough analysis of carbon flows between the atmosphere and ocean, and into and out of seaweeds would be undertaken, for assessing the magnitude of CO 2 removal and robust attribution of carbon sequestration to seaweeds.

    Original languageEnglish
    Pages (from-to)347-363
    Number of pages17
    JournalJournal of Phycology: An International Journal of Algal Research
    Volume58
    Issue number3
    Early online date14 Mar 2022
    DOIs
    Publication statusPublished - 16 Jun 2022

    Keywords

    • Carbon cycling
    • carbon dioxide removal
    • carbon sequestration
    • dissolved organic carbon
    • ocean afforestation
    • ocean-atmosphere equilibrium
    • particulate organic carbon
    • seawater carbonate system
    • seaweed aquaculture
    • carbon cycling
    • ocean–atmosphere equilibrium

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