Report on carbon cycle interactions and efficacy of land-based CDRs (e.g. BECCS), when combined with oceanic CDRs (individually or in a portfolio) (2 emails 9/2/2024 to 9/3/2024)
CDR
Report on carbon cycle interactions and efficacy of land-based CDRs (e.g. BECCS), when combined with oceanic CDRs (individually or in a portfolio)Sep 2 2024 10:07PM - Michael Hayes
Abstract:
In this deliverable 4.8, we analyze the Norwegian Earth System Model (NorESM) simulations from Deliverable 4.6 and 4.7 on land-based and ocean-based Carbon Dioxide Removal (CDR)
scenarios. We focus the analysis on BioEnergy coupled to CCS (BECCS) using sugarcane as feedstock, and ocean alkalinity enhancement (OAE), applied individually and in combinations. We find that a higher amount of carbon captured by making use of the carbon sequestration
potential of land and ocean together, as expected. The sugarcane yield is unaffected by the OAE deployment, however, carbon uptake by other parts of the land is somewhat reduced by OAE in the combined BECCS and OAE case. Less carbon is taken up by the oceans during BECCS deployment, whilst less carbon is taken up by land during the OAE deployment. The uptake
of carbon by the oceans in the combined BECCS and OAE case is directly additive from the individual cases. However, some non-linear responses are seen in other parts of the climate responses."
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Sep 3 2024 1:44AM - Michael Hayes
Marine BECCS is likely a reasonable option to explore as all aspects of terrestrial BECCS can be provided for in the marine space.
Establishing 'mBECCS' as a subclass of mCDR, as well as a subclass under typical terrestrial BECCS, can be justified at the marine engineering level. In that, the needed tech basket can likely be scaled up to CDR scale using largely marine environmental assets and marine-grade engineering.
Biochar is the CDR technology that can link both land and sea BECCS missions. This technical link between marine and land biotic CDR has been reference to as 'Blue Biochar' in the past, yet 'mBECCS' works and has also been mentioned in the past within this forum.
Combining biotic driven mBECCS tech and abiotic mCDR tech, such as electrolysis and/or enhanced mineral weathering, can use much of the same marine-grade infrastructure technology.
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